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Estudo da fauna de Anacroneuria (Plecoptera: Perlidae) na Bacia Hidrográfica do Rio dos Sinos, Estado do Rio Grande do Sul, com dados sobre a fecundidade de Anacroneuria trimacula; Study of the fauna of Anacroneuria (Plecoptera: Perlidae) from the Rio dos Sinos basin, and data on the fecundity of Anacroneuria trimacula

Ribeiro, Valdelânia Ribeiro de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 08/12/2006 Português
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Plecoptera é uma ordem relativamente pequena e primitiva de insetos. São conhecidas cerca de 2000 espécies pertencentes a 16 famílias. No Brasil são conhecidas duas famílias, Gripopterygidae e Perlidae. Dois gêneros são registrados no Estado do Rio Grande do Sul, Anacroneuria e Kempnyia. O objetivo deste estudo foi inventariar a fauna de Anacroneuria na bacia hidrográfica do Rio dos Sinos, Rio Grande do Sul. Além disso, devido à ausência de estudos sobre fecundidade de Perlidae para a região Neotropical, especialmente Anacroneuria, também objetivou determinar as taxas de fecundidade potencial e realizada de A. trimacula do referido Estado. Foram utilizados adultos coletados junto a rios da região de nascente do Rio dos Sinos, com a técnica de atração luminosa. Os adultos foram acondicionados em álcool etílico 80% e identificados com o auxílio de estereomicroscópio. Onze fêmeas de A. trimacula foram selecionadas, dissecadas e seu ovários analisados. Duas espécies novas foram descritas, Anacroneuria fiorentini e A. caraa, e outras oito espécies foram registradas: A. cathia Froehlich 2002, A. debilis (Pictet 1841), A. flintorum Froehlich 2002, A. fuscicosta (Enderlein 1909), A. plaumanni Jewett 1959, A. stanjewetti Froehlich 2002...

Effect of polyunsaturated fatty acids on the fecundity of the Amazon river prawn Macrobrachium amazonicum (Heller, 1862)

Ribeiro, Karina; Franceschini-Vicentini, Irene Bastos; Papa, Luciene Patrici; New, Michael B.; Valenti, Wagner Cotroni
Fonte: Wiley-Blackwell Publicador: Wiley-Blackwell
Tipo: Artigo de Revista Científica Formato: 1756-1763
Português
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Effects of the ratio of dietary fatty acids, namely n-3 (mainly long chain polyunsaturated LC-PUFA) to n-6 PUFA on the fecundity of Macrobrachium amazonicum were evaluated. In T1, the diet had equal and low levels of dietary n-3 and n-6 fatty acids (6 mg g(-1)). In T2, the concentration of n-3 (6 mg g(-1)) was a half of the concentration of the n-6 (12 mg g(-1)), and in T3, the diet had equal and high concentrations of n-3 and n-6 (12 mg g(-1)). Females with ovaries in stages I, III and V were collected. Higher gonadosomatic index (GSI) (6.89%) was observed in females in ovarian stage V than at other ovarian stages; however, the hepatosomatic index (HIS) showed high values in all females with ovaries in the stage III. A ratio of 1:2 n-3:n-6 fatty acids increased the GSI of mature females and the number of eggs spawned. Raising the level of both n-3 and n-6 fatty acids from 0.6% to 1.2% of the diet did not produce any effect on the GSI or on fecundity, suggesting that the ratio is more important than the absolute value of these two families of fatty acids.

Fecundity, body size and population dynamics of Chrysomya albiceps (Wiedemann, 1819) (Diptera: Calliphoridae)

Riback, T. I. S.; Godoy, W. A. C.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: 123-128
Português
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Neste estudo, a variação sazonal da fecundidade, comprimentos de asa e tíbia foram investigadas em populações naturais de Chrysomya albiceps (Wiedemann, 1819) como uma forma de determinar as variações bionômicas da espécie em função da sazonalidade. Uma trajetória temporal constante foi encontrada para fecundidade, comprimentos de asa e tíbia durante vinte e quatro meses. Correlações positivas entre fecundidade e comprimento de asa, fecundidade e comprimento de tíbia e comprimentos de asa e tíbia foram observadas. As implicações destes resultados para a dinâmica populacional de C. albiceps foram discutidas.; In this study, the seasonal variation of fecundity, wing and tibia length were investigated in natural populations of Chrysomya albiceps (Wiedemann, 1819) in an attempt to determine the changes in life history of the species as a function of seasonality. A relative constant temporal trajectory was found for fecundity, wing and tibia length over twenty-four months. Positive correlations between fecundity and wing size, fecundity and tibia size and wing and tibia sizes were observed. The implications of these results for population dynamics of C. albiceps are discussed.

Fecundity of crab Hepatus-pudibundas (herbst, 1785) (crustacea, decapoda, calappidae) in Ubatuba (SP), Brazil

Reigada, ALD; Negreirosfransozo, M. L.
Fonte: Inst Tecnologia Parana Publicador: Inst Tecnologia Parana
Tipo: Artigo de Revista Científica Formato: 661-668
Português
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The egg number and the rate in which they are produced constitute important informations for the comprehension of the reproductive process. The egg number carried by a female crab is related to a body dimension (carapace width or length). These data are adjusted to a linear regression. The specimens of Ii. pudibundus were collected in Ubatuba region, Brazil during the period from January 1991 to July 1993. In this paper 30 females with eggs in the initial embryonic phase were used to estimate ther egg number. The mean fecundity obtained was 75,615 +/- 30,120 eggs/female/spawn. Although the H. pudibundus fecundity was not high, it can be inferred that the larval survival in nature should be large, because it is one of the most abundant crabs in the studied area.

Protandry and female size-fecundity variation in the tropical butterfly Brassolis sophorae

Carvalho, M. C.; Queiroz, PCD; Ruszczyk, A.
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica Formato: 98-102
Português
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Protandry (the emergence of males before fe males) is currently explained either as a mating strategy to maximize number of matings in the males, or a way to minimize pre-reproductive mortality in females, Models of protandry have generally ignored variation in female quality (reproductive potential). We recorded the sex ratio, female body mass, wing length and potential fecundity (number and mass of eggs) of the tropical butterfly Brassolis sophorae through the emergence period. Temporal variation in female size and fecundity correlated with male potential for acquiring mates. Females from the end of the emergence period showed lower fecundity and size. Males emerging before and close to the median date of the female emergence period had greater mating opportunities. Males emerging either very early or late were penalized by few mating opportunities, or by encounters with small: low-quality females, respectively.

Fecundity of Biomphalaria straminea and B. glabrata in the laboratory: a twelve-month comparative study

Rozemberg,B.; Rey,L.; Pieri,O. S.
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1992 Português
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In the present comparative study a Biomphalaria straminea sample from Picos (Piauí) showed expressive advantages related to fecundity over a B. glabrata sample from Belo Horizonte (Minas Gerais) such as: higher egg-mass production in 10 out of 12 months of study; higher egg production in all months of study; higher egg per egg-mass ratio in 11 out of 12 months of study; 66% of the egg-masses containing more than 20 eggs while in B. glabrata 70% of the egg-masses showed less than 20 eggs; three times less empty egg capsules than B. glabrata; attainning maximum fecundity in half the time required by B. glabrata. Mortality however was higher and sooner in B. straminea, suggesting higher semelparity in this species than in B. glabrata, a possibility that requires confirmation through long-term studies with other samples of both species. This first finding of a B. straminea sample more fecund than B. glabrata is discussed in relation to other data from the literature, and some recommendations are made on the quantification of fecundity of planorbid snails.

Longevity and fecundity of Dichroplus maculipennis (Orthoptera, Acrididae) at non-outbreaking and outbreaking situations

Mariottini,Yanina; Wysiecki,María Laura De; Lange,Carlos Ernesto
Fonte: Sociedade Brasileira De Entomologia Publicador: Sociedade Brasileira De Entomologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2011 Português
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Dichroplus maculipennis is one of the most characteristic and damaging grasshopper species of Argentina, mainly in areas of the Pampas and Patagonia regions. We estimated and compared the longevity and fecundity of adult female D. maculipennis under controlled conditions (30ºC, 14L:10D, 40% RH) from individuals collected as last instar nymphs (VI) in the field and with a known recent history of low and high density conditions. Densities of D. maculipennis at the collecting sites were 0.95 individuals per m² in 2006 and 46 ind/m² in 2009, representing non-outbreaking and outbreaking situations, respectively. Adult female longevity in 2006 (67.96 ± 3.2 days) was significantly higher (p < 0.05) than in 2009 (37.44 ± 1.98 days). The number of egg-pods per female was 3.32 ± 0.44 for 2006 and 1.62 ± 0.26 for 2009. The average fecundity in 2006 (89.29 ± 11.9 eggs/female) was significantly greater (p < 0.05) than that in 2009 (36.27 ± 5.82 eggs/female). While it was observed that the oviposition rate was higher in 2006, this difference was not significant (p > 0.05). The fecundity curves showed that the highest values were at weeks 11 and 13 for the 2006 females, and at week 6 for those of 2009. Since the daily oviposition rate at low and high densities was not significantly different...

Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)

Juras,Anastácio Afonso; Yamaguti,Noriyoshi
Fonte: Instituto Oceanográfico da Universidade de São Paulo Publicador: Instituto Oceanográfico da Universidade de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1989 Português
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Investigations on the sexual maturity, spawning and fecundity of king weakfish, Macrodon ancylodon, off the southern coast of Brazil (lat. 29º to 32ºS) were carried out from September, 1976, to August, 1977. The sex ratio varied monthly, with slight predominance of males (51.14%) over females (48.86%). The mean size at first maturity was estimated as 27.4 cm TL for females and 21.5 cm TL for males. The macroscopic examination of gonads and analysis of the gonadal index indicated that December and February were the most intensive spawning months. Fish weight proved to be the best predictor data of fecundity: F = 17056.2500 + 425.3712 Wt (r² = 0.6434) , were F is the total number of eggs in both ovaries. The number of eggs of 199 females varied from 59,850 for 33.4 cm TL fish to over 358,450 for 37.2 cm TL; the mean fecundity verified was 165,273 eggs per female. Frequency distributions of egg diameter in the ovaries were polymodal, suggesting fractional spawning during the reproduction season.

Fecundity and fertility of Macrobrachium amazonicum (Crustacea, Palaemonidae)

da Silva,R. R.; Sampaio,C. M. S.; Santos,J. A.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2004 Português
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In Brazil, studies with native freshwater prawn species were discontinued due to great importance of Macrobrachium rosenbergii. Therefore, it is necessary to continue investigations about our species, in order to develop technology adequate to our reality and in a future allow prawn farmers to culture other species. The aim of this study was to determine the fecundity and fertility of Macrobrachium amazonicum captured monthly from June 1999 to June 2001 from Jaguaribe River, Itaiçaba, Ceará, Brazil. Prawns were collected using fishing net and transferred at Biological Science Laboratory, Ceará State University (Fortaleza, Ceará, Brazil). Among the ovigerous M. amazonicum females, 60 were randomly selected to determine fecundity. The eggs adhered to the pleopods were taken out and they were then placed in a Gilson solution, and then stored in alcohol 70%. Individual fecundity was determined from the total egg counting, using a stereoscopic microscope. To determine fertility, ovigerous M. amazonicum females were stored in individual 10 L-glass tanks maintained under strong aeration. After the hatching, the larvae were siphoned and counted. The data referring to total length and weight of all the females, storage date, coloration and number of eggs...

Fecundity, body size and population dynamics of Chrysomya albiceps (Wiedemann, 1819) (Diptera: Calliphoridae)

Riback,TIS.; Godoy,WAC.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2008 Português
Relevância na Pesquisa
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In this study, the seasonal variation of fecundity, wing and tibia length were investigated in natural populations of Chrysomya albiceps (Wiedemann, 1819) in an attempt to determine the changes in life history of the species as a function of seasonality. A relative constant temporal trajectory was found for fecundity, wing and tibia length over twenty-four months. Positive correlations between fecundity and wing size, fecundity and tibia size and wing and tibia sizes were observed. The implications of these results for population dynamics of C. albiceps are discussed.

Maternal effects on the fecundity and egg quality of the Patagonian stock of the Argentine Hake (Merluccius hubbsi)

Macchi, Gustavo Javier; Leonarduzzi, Ezequiel; Diaz, Marina Vera; Renzi, Marta; Rodrigues, Karina Andrea
Fonte: NOAA's National Marine Fisheries Service. Scientific Publications Office Publicador: NOAA's National Marine Fisheries Service. Scientific Publications Office
Tipo: info:eu-repo/semantics/article; info:ar-repo/semantics/artículo; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Português
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Influence of age, size and condition of spawning females on fecundity and oocyte quality were analyzed for Merluccius hubbsi Patagonian stock. Samples of mature females were collected in the spawning area during two research surveys carried out in the main reproductive peak in January 2010 and 2011. Batch fecundity (BF) ranged between 40,500 and 2,550,000 hydrated oocytes, and was positively correlated with total length, gutted weight, age, hepatosomatic index (HSI) and the relative condition factor (Kn). Relative fecundity ranged between 85 and 1040 hydrated oocytes and showed significant positive relationships with gutted weight, HSI and Kn; however coefficient of determinations were rather low for all regressions. Dry weight of 100 hydrated oocytes resulted between 1.8 and 3.95 mg and was positively correlated with all variables analyzed, and with batch and relative fecundity. Multiple regression models constructed employing females morpho-physiological characteristics as variables, evidenced maternal influence on fecundity and weight of the eggs. Larger individuals showed better condition, mainly revealed by higher HSI, and hydrated oocytes with larger oil droplets. Moreover larger hake females showed higher feeding activity during the spawning season in comparison with young individuals.; Fil: Macchi...

Fecundity variation and abundance of female blue crab Callinectes sapidus Rathbun, 1896 (Decapoda, Brachyura, Portunidae) in the Patos Lagoon estuary, RS, Brazil

Rodrigues, Marcos Alaniz; Heberle, Marina Federhen; D'Incao, Fernando
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
Português
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Neste trabalho são estudadas a variação na fecundidade e a abundância de fêmeas do siri-azul Callinectes sapidus Rathbun, 1896 no estuário da Lagoa dos Patos, Rio Grande do Sul, Brasil. Foram realizadas coletas junto à barra da Lagoa dos Patos entre novembro de 2008 e outubro de 2009. Os ovos das fêmeas foram retirados, pesados, contados e relacionados com as medidas morfométricas. Também foi relacionada a abundância das fêmeas ovígeras coletadas na área de desova com parâmetros ambientais. A fecundidade variou de 152.799 a 2.573.576 ovos. Foi encontrada uma correlação positiva entre a fecundidade e a largura de carapaça. Foram encontradas fêmeas ovígeras de novembro de 2008 a maio de 2009, e em outubro de 2009. A fecundidade da espécie para o estuário da Lagoa dos Patos parece ficar dentro dos limites encontrados em outros estuários de ocorrência, sugerindo que exista um padrão em seu potencial reprodutivo. A espécie apresenta um período de desova bem marcado durante o período que compreende o final da primavera e todo o verão. Faz-se necessária a proteção do estoque de fêmeas com potencial para desova no estuário da Lagoa dos Patos, visto que delas depende o recrutamento da espécie na temporada reprodutiva seguinte.; Female fecundity and abundance of the blue crab Callinectes sapidus Rathbun...

Fecundity estimation of Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) of Georges Bank: Application of the autodiametric method

Alonso-Fernández, Alexandre; Vallejo, Ann Carole; Saborido-Rey, Fran; Murua, Hilario; Trippel, Edward A.
Fonte: Elsevier Publicador: Elsevier
Tipo: Pre-print Formato: 918459 bytes; application/pdf
Português
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8 pages, 4 figures, 5 tables.-- Printed version published Jul 2009.; Haddock, Melanogrammus aeglefinus (L.), and Atlantic cod, Gadus morhua (L.), are species of major commercial interest in the Northwest Atlantic and their spawning strategy is characterized by group-synchronous oocyte development and determinate fecundity. Recent advances in image analysis systems and the development of the autodiametric method have led to rapid assessment and accurate estimation of the annual egg production of an individual or its potential fecundity. In this study we estimated the corresponding autodiametric calibration curves for Atlantic cod and haddock of Georges Bank and used these to estimate potential fecundity of these two species near the southern limits of their geographic distribution. In addition, we explored the relationships between potential fecundity and different condition indices for these populations and found the hepatosomatic index to significantly increase the explanatory power of the fecundity–length relationship which is in agreement with previous studies on the influence of nutritional state on egg production.; The authors would like to thank the crews of Fisheries and Oceans Canada Research Vessels Needler, Teleost and Templeman for providing samples and data necessary for our study. Funding was provided by a grant from Xunta de Galicia...

Sexual maturity, spawning and fecundity of king weakfish Macrodon ancylodon, caught off Rio Grande do Sul State (southern coast of Brazil)

Juras, Anastácio Afonso; Yamaguti, Noriyoshi
Fonte: Universidade de São Paulo. Instituto Oceanográfico Publicador: Universidade de São Paulo. Instituto Oceanográfico
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 01/01/1989 Português
Relevância na Pesquisa
37.02%
Investigations on the sexual maturity, spawning and fecundity of king weakfish, Macrodon ancylodon, off the southern coast of Brazil (lat. 29º to 32ºS) were carried out from September, 1976, to August, 1977. The sex ratio varied monthly, with slight predominance of males (51.14%) over females (48.86%). The mean size at first maturity was estimated as 27.4 cm TL for females and 21.5 cm TL for males. The macroscopic examination of gonads and analysis of the gonadal index indicated that December and February were the most intensive spawning months. Fish weight proved to be the best predictor data of fecundity: F = 17056.2500 + 425.3712 Wt (r² = 0.6434) , were F is the total number of eggs in both ovaries. The number of eggs of 199 females varied from 59,850 for 33.4 cm TL fish to over 358,450 for 37.2 cm TL; the mean fecundity verified was 165,273 eggs per female. Frequency distributions of egg diameter in the ovaries were polymodal, suggesting fractional spawning during the reproduction season.

Polyandry and fecundity in the Lepidoptera: can methodological and conceptual approaches bias outcomes?

Torres-Vila, Luis; Rodriguez-Molina, M; Jennions, Michael
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
Português
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Polyandry is a reproductive strategy whose occurrence has been explained in terms of both direct and indirect benefits to females. Among the direct benefits, a positive correlation between female remating and fecundity, mediated by receipt of nuptial gifts, is considered a major factor maintaining polyandry. However, a careful inspection of available studies reveals that such a correlation is not universal. In this comparative study of Lepidopterans we analysed two-way contingence tables based on 60 studies, and performed a meta-analysis of 39 studies to document associations between (1) the mating pattern (monandrous or polyandrous); (2) the methodological approach used (experimental or descriptive); and (3) the effect of female remating on fecundity. All three variables were significantly associated. Studies where remating increased fecundity were more often established in polyandrous species and when the experimental method was used. However, the experimental method also tended to be utilised more often for polyandrous species. Meta-analysis confirmed these 'vote-count'-based associations. We were also able to differentiate the relative effects of mating pattern and methodology on the remating-fecundity relationship. In polyandrous species...

Alguns aspectos da biologia de Biomphalaria glabrata (Say, 1818) e Biomphalaria tenagophila (D'Orbigny, 1835) (Pulmonata, planorbidae): II - Fecundidade e fertilidade; Some biological aspects of Biomphalaria glabrata (Say, 1818) and Biomphalaria tenagophila (D'Orbigny, 1835) (Pulmonata, planorbidae): II - Fecundity and fertility

Kawazoe, Urara
Fonte: Universidade de São Paulo. Faculdade de Saúde Pública Publicador: Universidade de São Paulo. Faculdade de Saúde Pública
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/03/1977 Português
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Foi realizada, comparativamente, a avaliação do número de cápsulas ovíferas e ovos por caramujo e do número de ovos por desova (fecundidade) e a verificação da taxa de eclosão e de ovos férteis (fertilidade) de Biomphalaria glabrata e Biomphalaria tenagophila, no período de um ano, em condições de laboratório. Verificou-se que a média do número de ovos por desova foi significativamente maior em B. glabrata (19,9) do que em B. tenagophila (16,2), constatando-se que ambas as espécies apresentavam maior fecundidade no mês de abril, embora os fatores ambientes tenham influído pouco no parâmetro em questão. A fecundidade traduzida pelo número de desovas por caramujo-dia, mostrou-se maior em B. glabrata (0,65) do que em B. tenagophila (0,56), o mesmo acontecendo em relação ao número de ovos por caramujo-dia pois B. glabrata apresentou média de 13,4 e B. tenagophila média de 9,9. Considerando-se a fertilidade como a percentagem de eclosão dos caramujos, B. glabrata apresentou média de 95,8% e B. tenagophila a média de 90,5% de eclosão, sendo esta diferença significativa ao nível de 5%. As taxas mais elevadas de eclosão em B. glabrata foram verificadas nos meses de nomais elevadas de eclosão em B. glabrata foram verificadas nos meses de novembro a janeiro (98...

Initial sexual maturity and fecundity of the goldfish Carassius auratus (Perciformes: Cyprynidae) under semi-controlled conditions

Ortega-Salas,A.A; Reyes-Bustamante,H
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2006 Português
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We studied the time of initial sexual maturity and the fecundity of the goldfish Carassius auratus under semi-controlled conditions. During the study the water temperature fluctuated from 21 to 30 ºC, the pH between 7 and 8, and the dissolved oxygen between 5.5 and 7 ppm. Sixty days old juvenile fish received prophylactic treatments of brackish water (15 ‰) and methylene blue baths (1 %), and they were fed with live Daphnia magna. The initial sexual maturity occurred between 225 and 233 days of captivity. Mean absolute fecundity was 2 347 (± 302.2 SD) ova per gonad, and mean relative fecundity was 63.44 eggs/g fish weight. Gonadosomatic index was between 7.5 and 9.0. Our data will allow ornamental fish producers to calculate the time of initial maturity and fecundity for this species. Rev. Biol. Trop. 54 (4): 1113-1116. Epub 2006 Dec. 15.

Fecundity, growth, and survival of the angelfish Pterophyllum scalare (Perciformes: Cichlidae) under laboratory conditions

Ortega-Salas,Armando A; Cortés G,Isabel; Reyes-Bustamante,Hugo
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2009 Português
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The freshwater angelfishes (Pterophyllum) are South American cichlids that have become very popular among aquarists, yet scarce information on their culture and aquarium husbandry exists. We studied Pterophyllum scalare to analyze dietary effects on fecundity, growth, and survival of eggs and larvae during 135 days. Three diets were used: A) decapsulated cysts of Artemia, B) commercial dry fish food, and C) a mix diet of the rotifer Brachionus plicatilis and the cladoceran Daphnia magna. The initial larval density was 100 organisms in each 40L aquarium. With diet A, larvae reached a maximum weight of 3.80g, a total length of 6.3 cm, and a height of 5.8cm; with diet B: 2.80g, 4.81cm, and 4.79cm, and with diet C: 3.00g, 5.15cm, and 5.10cm, respectively. Significant differences were observed between diet A, and diet B and C, but no significantly differences were observed between diets B and C. Fecundity varied from 234 to 1 082 eggs in 20 and 50g females, respectively. Egg survival ranged from 87.4% up to 100%, and larvae survival (80 larvae/40L aquarium) from 50% to 66.3% using diet B and A, respectively. Live food was better for growing fish than the commercial balanced food diet. Fecundity and survival are important factors in planning a good production of angelfish. Rev. Biol. Trop. 57 (3): 741-747. Epub 2009 September 30.

Fecundity of Sebastes mentella and Sebastes norvegicus in the Irminger Sea and Icelandic waters

Saborido-Rey,Fran; Domínguez-Petit,Rosario; Garabana,Dolores; Sigurðsson,Þorsteinn
Fonte: Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas Publicador: Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2015 Português
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37.26%
Fecundity of redfish Sebastes mentella and Sebastes norvegicus in the Irminger Sea and Icelandic waters was analyzed in relation to several maternal features and oocyte developmental stages. The mean potential fecundity in S. norvegicus was estimated to be 123,300 oocytes and relative fecundity averaged 116 oocytes g-1. Mean potential fecundity in S. mentella was 50,013 oocytes and relative fecundity was 64 oocytes g-1. Strong fecundity down-regulation (50% on average) was observed during oocyte development estimated from September to November, when oocytes reached the advanced stage of vitellogenesis. This result implies that fecundity can only be comparable between individuals presenting the same stage of oocyte development. However, the development rates differed between species and between stocks, and therefore the same stage is reached at a different time of the year. Fecundity varied significantly with female weight and length, while condition had little influence on fecundity variation.

Relative viable fecundity in the red lobster Panulirus interruptus (Randall, 1840) in Baja California, Mexico

Díaz-Iglesias,Eugenio; Báez-Hidalgo,Marysabel
Fonte: UAM, Unidad Iztapalapa, Publicador: UAM, Unidad Iztapalapa,
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2010 Português
Relevância na Pesquisa
37.02%
The fundamental objective of this work is to estimate the Relative Viable Fecundity as the number of phylosomes born alive during hatching of the spawn, per longitude of the cephalothorax per female, of Panulirus interruptus in Baja California, Mexico, under laboratory conditions, with goals for its application on the culturing of the specie. The zones of origin of the spawning females were: Bahía Todos Santos, Punta Baja and Isla de Cedros, Baja California, México. From the females between 62.0-97.2 Lc (mm), an average of 224,402 live phylosomes were obtained up to 3 days after hatching. The Relative Viable Fecundity resulted between 900.1-6,922.8 phylosomes/Lc (mm), with a mean of 2 795 phylosomes/Lc (mm). The relationship between the cephalothorax length (mm) and the number of phylosomes resulted: Phylosomes = 0.0083 Lc (mm)3.9046; r² = 0.615. The Relative Viable Fecundity estimated for this work resulted greater than that currently reported in the literature for Jasus edwardsii.