Stages of gonadal development and mean length at first maturity of wild females of white shrimp (Litopenaeus schmitti – Decapoda, Penaeidae) in southern Brazil



Document title: Stages of gonadal development and mean length at first maturity of wild females of white shrimp (Litopenaeus schmitti – Decapoda, Penaeidae) in southern Brazil
Journal: Atlantica (Rio Grande)
Database: PERIÓDICA
System number: 000331624
ISSN: 0102-1656
Authors: 1
1
1
Institutions: 1Universidade Federal do Rio Grande, Instituto de Oceanografia, Rio Grande, Rio Grande do Sul. Brasil
Year:
Season: Jul-Dic
Volumen: 31
Number: 2
Pages: 169-175
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract 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
Portuguese abstract 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
Disciplines: Biología
Keyword: Crustáceos,
Reproducción y desarrollo,
Ciclo reproductivo,
Desarrollo gonádico,
Talla de madurez,
Madurez sexual,
Litopenaeus schmitti
Keyword: Biology,
Crustaceans,
Reproduction and development,
Reproductive cycle,
Gonadic development,
Size at maturity,
Sexual maturity,
Litopenaeus schmitti
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