A comparative study of the ovarian development in wild and pond-reared shrimp, Penaeus kerathurus (Forskål, 1775)

Medina, Antonio; Vila, Y.; Mourente, Gabriel; Rodrı́guez, Antonio

doi:10.1016/s0044-8486(96)01408-1

Cited by 59 publications

(48 citation statements)

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“…Estimated mean length at first maturity (LM) was 152 mm (TL) ( Figure 5, Table II) and the length at which 100% of females are mature is 170 mm (TL). (Vogt et al, 1989;Castille & Lawrence, 1991;Tan-Fermin, 1991;Medina et al, 1996;Quintero & Garcia, 1998;Palacios et al, 1999). Recently, the investigations intending to classify the ovaries for fishery management purposes have suggested the simplification of the development stages, reducing it to only 4, named immature, developing, ripe and spent (Peixoto et al, 2003;Dumont et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…This technique has been proved to be useful in many penaeid species, such as F. paulensis and F. brasiliensis (Peixoto et al, 2003;Dumont et al, 2007), A. longinaris, (Dumont & D´Incao, 2004, Penaeus indicus (Castille & Lawrence, 1991;Quinitio & Millamena, 1992), Penaeus kerathurus (Medina et al, 1996;Vogt et al, 1989) and Penaeus monodon (Palacios et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Stages of gonadal development and mean length at first maturity of wild females of white shrimp (Litopenaeus schmitti - DECAPODA, PENAEIDAE) in southern Brazil

Machado¹,

Dumont²,

D’Incao³

2009

Atlântica

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The stages of gonadal development for the female of white shrimp (Litopenaeus schmitti (Burkenroad, 1936)) were characterized based on histological analysis. Four stages (immature, developing, ripe and spawned) were determined according to the structure and arrangement of cells in the ovary. Each stage corresponds macroscopically to a characteristic color, except stages I (immature) and IV (spawned), in which colors are very similar and can be distinguished only microscopically. The chromatic scale varies from white/translucent (stage I), gray/green (developing), dark green to black (ripe). The mean size of cells was 54.01 µm (±3.5) (stage I), 136.80 µm (±8.8) (stage II) and 199.80 µm (±6.4) (stage III). The size frequency of cells was polymodal, and different cell stages were observed in ripe ovary, suggesting the occurrence of multiple spawning. The smallest ripe female measured 146 mm and the largest 180 mm of the total length. Estimated mean length at first maturity was 152 mm and the length at which 100% of females are mature is 170 mm. KEY WORDS:Litopenaeus schmitti, shrimp, reproduction, gonadal histology, length at first maturity RESUMO Os estágios de desenvolvimento das gônadas das fêmeas do camarão-branco (Litopenaeus schmitti (Burkenroad,1936)) foram caracterizadas por análise histológica. Quatro estágios (imaturo, em desenvolvimento, maduro e desovado) foram determinados de acordo a estrutura e arranjo das células no ovário. Cada estágio corresponde, microscopicamente, a uma cor característica, exceto nos estágios I (imaturo) e IV (desovado) nos quais as cores são muito similares e podem ser distinguidas apenas histologicamente. A escala cromática varia do branco/translúcido (estágio I), cinza/verde (em desenvolvimento), verde escuro a preto (maduro). O tamanho médio das células foi 54,01 µm (±3,5) (estagio I), 136,80 µm (±8,8) (estágio II) e 199,80 µm (±6,4) (estágio III). A distribuição de frequência do tamanho das células foi polimodal, e diferentes estágios celulares foram observados nos ovários maduros, sugerindo a ocorrência de desovas múltiplas. A menor fêmea madura mediu 152 mm e o comprimento em que 100% das fêmeas estavam maduras foi 170 mm.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stages of gonadal development and mean length at first maturity of wild females of white shrimp (Litopenaeus schmitti - DECAPODA, PENAEIDAE) in southern Brazil

Machado¹,

Dumont²,

D’Incao³

2009

Atlântica

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“…Dessa forma, foi possível estabelecer uma escala prática de uso em laboratório para classificação rápida das gônadas de A. longinaris. Esse método foi amplamente utilizado por autores que realizaram estudos, tanto de dinâmica reprodutiva, quanto em experimentos de aqüicultura (VOGT et al, 1989;CASTILLE & LAWRENCE, 1991;QUINITIO & MILLAMENA, 1992;MEDINA et al, 1996;PALACIOS et al, 1999).…”

Section: Discussionunclassified

“…Grande parte dos autores divide o desenvolvimento gonadal microscópico em 5 estágios (imaturo, em desenvolvimento, maturação incipiente, maduro e desovado) (VOGT et al, 1989;CASTILLE & LAWRENCE, 1991;TAN-FERMIN, 1991;MEDINA et al, 1996;QUINTERO & GRACIA, 1998;PALACIOS et al, 1999). Os estágios I (imaturo) e II (em desenvolvimento) não mostram diferença significativa, tanto no diâmetro celular, quanto nas características estruturais e químicas dos ovócitos (QUINTERO & GRACIA, 1998).…”

Section: Discussionunclassified

“…Foram considerados em atividade reprodutiva apenas indivíduos em estágio III (maduro) (equivalente ao estágio IV de VOGT et al, 1989;CASTILLE & LAWRENCE, 1991;TAN-FERMIN, 1991;MEDINA et al, 1996;QUINTERO & GRACIA, 1998;PALACIOS et al, 1999). No entanto, alguns autores dividem os estágios de maturação em dois grupos, maduros e imaturos, baseando-se em análises estatísticas do diâmetro médio dos ovócitos (QUINTERO & GRACIA, 1998), considerando como reprodutivas as fêmeas que apresentam os ovários em maturação incipiente e os maduros.…”

Section: Discussionunclassified

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Estágios de desenvolvimento gonadal de fêmeas do camarão-barba-ruça (Artemesia longinaris - Decapoda: Penaeidae)

Dumont¹,

D’Incao

2004

Iheringia, Sér. Zool.

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ABSTRACT. Stages of gonadal development in females of "barba-ruça" shrimp (Artemesia longinarisDecapoda, Penaeidae). The stages of gonadal development for the female of "barba-ruça" shrimp (Artemesia longinaris Bate, 1888) were characterized based on histological analysis. Four stages (immature, almost mature, ripe and spawned) were determined according to the structure and arrangement of cells in the ovary. Each stage corresponds macroscopically to a characteristic color, except stages I (immature) and IV (spawned), in which colors are very similar and can be distinguished only microscopically. The chromatic scale varies from white/translucent (stage I), neutral green (almost mature) to dark green (ripe). The mean size of cells was 56.9 µm (±3.5) (stage I), 127 µm (±2.6) (stage II) and 183 µm (±1.91) (stage III). The size frequency of cells was polimodal, and different cell stages were observed in ripe ovary, suggesting the occurrence of multiple spawning. The chromatic scale developed is an important tool for laboratory analysis, and can be easily used to identify the gonadal stages.

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Induction of Ovarian Maturation in Penaeus monodon by Molecular Signal Interventional Approach

2012

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Vitellogenin (VTG) synthesis in the hepatopancreas and ovary is negatively regulated by vitellogenesis-inhibiting hormone (VIH) produced in the neurosecretory cell of X-organ/sinus gland complex of the eyestalks of penaeid shrimp. Eyestalk ablation is used commercially to induce ovarian maturation in shrimps which leads to an eventual loss of the spawner. The aim of the present study was to understand the molecular mechanism of VIH regulation in ovarian development and its inhibition of VTG gene expression by using a MEK-specific inhibitor (U0126). The real-time quantitative PCR results showed VTG mRNA level was progressively increased in the ovary and hepatopancreas of unilateral eyestalk-ablated and inhibitor-treated shrimps. Western blot analysis also showed that phosphoMEK was detected only in the unilateral eyestalk-ablated and control shrimp, whereas phospho-MEK was not detected in inhibitor-treated shrimp. DAX-1, SF-1, and StAR expression correlated with changes in VIH mRNA and altered phospho-ERK levels. This is consistent with the hypothesis that suppression of DAX-1 results in SF-1-mediated StAR protein upregulation of estradiol that is implicated in vitellogenesis. This is the first report that demonstrates the molecular mechanism of VIH suppression via MEK pathway to induce ovarian maturation in female Penaeus monodon by molecular signal intervention, a less-invasive method than traditional eyestalk ablation.

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A comparative study of the ovarian development in wild and pond-reared shrimp, Penaeus kerathurus (Forskål, 1775)

Cited by 59 publications

References 10 publications

Stages of gonadal development and mean length at first maturity of wild females of white shrimp (Litopenaeus schmitti - DECAPODA, PENAEIDAE) in southern Brazil

Stages of gonadal development and mean length at first maturity of wild females of white shrimp (Litopenaeus schmitti - DECAPODA, PENAEIDAE) in southern Brazil

Estágios de desenvolvimento gonadal de fêmeas do camarão-barba-ruça (Artemesia longinaris - Decapoda: Penaeidae)

Induction of Ovarian Maturation in Penaeus monodon by Molecular Signal Interventional Approach

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