Endocrine Profiles of Female Striped Bass (Morone saxatilis) in Captivity, during Postvitellogenesis and Induction of Final Oocyte Maturation via Controlled-Release GnRHa-Delivery Systems

Mylonas, Constantinos C.; Woods, L. Curry; Thomas, Peter; Zohar, Yonathan

doi:10.1006/gcen.1998.7073

Cited by 86 publications

(51 citation statements)

References 47 publications

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“…Contreras-Sánchez et al (1998) found similar results in Oncorhynchus mykiss submitted to moderate stress during vitellogenesis. The results obtained in this study can be attributed to other factors such as: stress due to confinement, affecting the quality and size of oocytes during maturation (Foo and Lam, 1993;Campbell et al (1994); Sumpter et al (1994); Pankhurts and Van der Kraak, 1997), and/or the environmental quality of contention ponds (Schreck, 1981;Wendelaar-Bonga, 1997) and/or the nutritional conditions of females (Watanabe, 1990;Izquierdo et al, 2001), specially the accumulation of lipides in vitellogenesis (Wiegand, 1996). On the other hand, wild females capable of overcoming stress during the procedure have responded to induction and produced eggs of bigger diameter.…”

Section: Discussionmentioning

confidence: 57%

“…Secondary responses to stress, such as increase of blood glucose and hepatic glycogenesis (Pickering, 1981;Vijayan and Moon, 1992;Barton, 2000), changes in hematology values (Mazeaud et al, 1977;Carneiro, 2001), blood electrolytic and osmoregulation alterations (Eddy, 1981;Camichael et al, 1984;Cech et al, 1996;McDonald and Milligan; and depression in the immune system (Balm, 1997;Carneiro, 2001), vary and depend on multiple factors. Some of this factors may be the species, origin, age, sex and singular physiological conditions of the animals, among others (Mylonas et al, 1998;Pottinger and Carrick, 1999). In reproductive active specimens, the hormonal activity, gonadal development stage and nutritional conditions also have influence (Lam, 1985;Pankhurts and Van der Kraak, 1997;Wendelaar-Bonga, 1997), as well as the stressor type and severity (Donaldson, 1981;Pickering, 1981;Sumpter, 1997;Barton, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Some of this factors may be the species, origin, age, sex and singular physiological conditions of the animals, among others (Mylonas et al, 1998;Pottinger and Carrick, 1999). In reproductive active specimens, the hormonal activity, gonadal development stage and nutritional conditions also have influence (Lam, 1985;Pankhurts and Van der Kraak, 1997;Wendelaar-Bonga, 1997), as well as the stressor type and severity (Donaldson, 1981;Pickering, 1981;Sumpter, 1997;Barton, 2000). Both the response to hormone inductor and survival of post-induction breeders were larger in the group of females subject to monthly manipulation practices (G1).…”

Section: Discussionmentioning

confidence: 99%

“…They were then selected by measurements of the ovocytes's diameter (minimum average 1,100µm) and the percentage distribution of final phases of nuclear oocyte migration (50% as minimum average value of migrating nuclei), from oocytes obtained through cannulation, according to Harvey and Caroslfeld (1993). Three selected females of each group in each occasion were simultaneously induced to ovulate with Carp Pituitary Extract (previous dose of 0.25mg / kg, 1 st dose of 0.5mg / kg after 24 hours and 2 nd dose of 5mg / kg after 12 hours), according to Pardo-Carrasco et al (1998). Environmental conditions during the inductive procedures were: temperature 26.3 ± 0.2°C, pH 6.1 ± 0.3 and dissolved oxygen 6.3 ± 0.2mg / L. Spawn were obtained by abdominal pressure and dry fertilized with semen of 80% minimum espermatic motility.…”

Section: Methodsmentioning

confidence: 99%

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Criação e domesticação de fêmeas de Brycon siebenthalae destinadas a reprodução

Castellanos¹,

Zaniboni‐Filho

Pardo-Carrasco

et al. 2004

Acta Sci. Anim. Sci.

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ABSTRACT. Brycon siebenthalae (yamú) (Characidae) have quite an untamable "nature", with intense, enduring responses to stress. Three groups of females were induced to spawn in order to study the effects of manipulation during breeding. Groups one and two were formed by four year-old specimens bred in earth ponds. Females from group one and two were subjected to monthly and anual "domestication" practices, respectively, from the time they were six months old. The third group of females was brought from the natural environment. It was observed that females bred and monthly tamed had better induction responses, relative fecundity and post-spawn survival. The physiological responses to different stress situations during the reproductive procedure did not significantly affect (p>0.05) fertility and embryonic and larval survival among groups.Key words: Brycon siebenthalae, domestication, reproduction, yamú.RESUMO. Criação e domesticação de fêmeas de Brycon siebenthalae destinadas a reprodução. Brycon siebenthalae (yamú) (Characidae) tem uma natureza indomável, apresentando respostas ao estresse intensas e duradouras. Três grupos de fêmeas foram tratados com hormônios gonadotróficos para induzir a maturação final e desova, buscando avaliar o efeito da manipulação das fêmeas durante o período de maturação gonadal. O primeiro e segundo grupo eram formados por peixes de quatro anos de idade criados em viveiros de terra. As fêmeas do primeiro grupo foram submetidas ao manejo mensal de "domesticação" a partir do sexto mês de idade. O segundo grupo foi submetido a esse manejo com freqüência anual. O terceiro grupo de fêmeas foi capturado do ambiente natural. As fêmeas submetidas ao manejo mensal apresentaram melhores resultados referente a resposta ao tratamento hormonal, a fecundiade relativa e a sobrevivência após o manejo da reprodução. Os distintos procedimentos de manejo das fêmeas durante a maturação gonadal não afetaram (p>0,05) a taxa de fertilização e a sobrevivência dos ovos e larvas provenientes dos diferentes grupos.Palavras-chave: Brycon siebenthalae, domesticação, reprodução, yamú.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Criação e domesticação de fêmeas de Brycon siebenthalae destinadas a reprodução

Castellanos¹,

Zaniboni‐Filho

Pardo-Carrasco

et al. 2004

Acta Sci. Anim. Sci.

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“…Em Seriola lalandi lalandi, as concentrações de T são maiores durante a vitelogênese e maturação final dos oócitos (Poortenaar, 2001). E em Morone saxatilis, o aumento ocorre somente na migração da vesícula germinativa (Mylonas, et al, 1998).…”

Section: Discussionunclassified

Aspectos reprodutivos e perfil hormonal dos esteróides sexuais do pirarucu, Arapaima gigas (SCHINZ,1822), em condições de cativeiro

et al. 2010

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RESUMOEsta pesquisa teve como objetivo caracterizar a reprodução e o perfil hormonal dos esteróides sexuais do pirarucu, Arapaima gigas, além de validar um aspecto do dimorfismo sexual secundário. O experimento foi realizado na Fazenda Santo Antônio II, em Presidente Figueredo-AM, no período de fevereiro de 2004 a fevereiro de 2005. Foram selecionados 24 exemplares e divididos em três grupos de oito peixes (grupo "A", "B" e "C" com pirarucus de mais de quatro anos de idade, com três anos e dois anos, respectivamente). Os pirarucus foram estocados em três tanques de 400m 2 , um para cada grupo. Aspectos comportamentais, como o interesse por alimento, brigas, formação de casais e presença de ninhos, foram observados ao longo de todo o experimento. Amostras de sangue foram coletadas mensalmente, de todos os peixes, observou-se a presença de uma mancha alaranjada no macho como uma característica sexual secundária. Foram mensurados os níveis de testosterona (T), 17beta-estradiol (E 2 ) e 17alfa-hidroxi-progesterona (17aOHP) através de radioimunoensaio (RIA) de fase sólida. Todos os machos dos grupos "A" e "B" puderam ser identificados pela mancha alaranjada na região inferior da cabeça, corroborada pela concentração de testosterona, comprovando o conhecimento empírico dos ribeirinhos. Os níveis de T e E 2 nos peixes do grupo "A" e "B" tiveram maiores picos no início do período de chuva, enquanto que o 17aOHP teve oscilações constantes e pequenos picos no final do período chuvoso, os peixes do grupo "C" acompanharam essa tendência em concentrações menores. PALAVRAS-CHAVE: pirarucu, reprodução, esteróides sexuais, Arapaima gigas. Reproductive Aspects and Sexual Steroids Hormonal Profiles of Pirarucu, Arapaima gigas (SCHINZ,1822), in Captivity Conditions ABSTRACTThe purpose of this study was to characterize the growth, reproduction and hormonal profile of pirarucu, Arapaima gigas, and validate one sexual dimorphism characteristic. The experiment was carried in the fish farm Santo Antonio II, Presidente Figueredo city in the state of Amazonas -Brazil, from February 2004 to February 2005 In the experiment, 24 fishes were selected and divided in three groups, with eight fish in each one. The pirarucus from "A" group were older than four years. In "B" group the fishes were three years old and in "C" group these were two years old. The pirarucus were stocked in 400 m 2 excavated ponds, one pond for each group. Reproductive behavior like feeding interest, fights, pair formation and presence of nest were observed. Blood samples were taken monthly from all fishes during the experiment period, the sexual dimorphism characteristic was observed. Testosterone (T), 17b-estradiol (E 2 ) and 17ahidroxi-progesterona (17aOHP) levels were measured by radioimunoassay (RIA) in solid phase. All males of group "A" and "B" could be identified by an orange mark under the head, and the levels of T validated this data, proving the empirical knowledge of river men. T and E 2 levels of group "A" and "B" picked in the beginning of raining period an...

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Gonadal development and plasma steroid levels during pubertal development in captive-reared striped bass,Morone saxatilis

Holland¹,

Hassin²,

Zohar³

2000

J. Exp. Zool.

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Puberty is the period during which full sexual development occurs and the capacity to reproduce is acquired. Despite its importance, our understanding of the endocrine regulation of puberty in lower vertebrates is still limited. The objective of the present study was to describe the changes in gonadal development and plasma steroid levels in a relatively late maturing species, the striped bass, during the first four years of life. In about 65% of the females, puberty was initiated during the third year. Although gonadosomatic index (GSI) and oocyte diameter increased during this year, this first cycle was characterized by a heterogeneous population of developing oocytes, a relatively low mean maximum oocyte diameter, and an absence of yolk granules in the oocytes. Plasma 17β‐estradiol (E2) levels were low in all three‐year‐old fish, suggesting that an insufficient stimulation of vitellogenin production by E2 may underlie the lack of vitellogenin incorporation into developing oocytes. All monitored parameters increased during the fourth year, but were still below the values attained by older females. In about 60% of the males, puberty was initiated during the first year and all males were mature by the third year. During the first two years, several immature males initiated spermatogenesis without reaching full maturity. In mature males, mean GSI, plasma testosterone, and 11‐ketotestosterone levels increased simultaneously, reaching higher values each subsequent year. Our results indicate that, similar to the situation in mammals, more than one reproductive cycle is required in striped bass before complete adulthood is reached. J. Exp. Zool. 286:49–63, 2000. © 2000 Wiley‐Liss, Inc.

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Endocrine Profiles of Female Striped Bass (Morone saxatilis) in Captivity, during Postvitellogenesis and Induction of Final Oocyte Maturation via Controlled-Release GnRHa-Delivery Systems

Cited by 86 publications

References 47 publications

Criação e domesticação de fêmeas de Brycon siebenthalae destinadas a reprodução

Criação e domesticação de fêmeas de Brycon siebenthalae destinadas a reprodução

Aspectos reprodutivos e perfil hormonal dos esteróides sexuais do pirarucu, Arapaima gigas (SCHINZ,1822), em condições de cativeiro

Gonadal development and plasma steroid levels during pubertal development in captive-reared striped bass,Morone saxatilis

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