Abstract
The stages of gonadal development for the female of barba-ruca 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.
Highlights
Stages of gonadal development in females of "barba-ruça" shrimp (Artemesia longinaris Decapoda, Penaeidae)
Definir os estágios de maturação gonadal e desenvolver uma escala cromática de uso prático em laboratório, que caracterize o estágio de maturação sexual da gônada feminina, é o primeiro passo no sentido de entender a dinâmica reprodutiva de A. longinaris
Os diâmetros médios dos ovócitos de A. longinaris mostraram grande similaridade com outros resultados obtidos para a espécie (CHRISTIANSEN & SCELZO, 1971), assim como para outros peneídeos, inclusive no que diz respeito à sobreposição de diâmetros entre os dois últimos estágios de maturação (GUITART & QUINTANA, 1978; RAMOS & TORRAS, 1986)
Summary
Stages of gonadal development in females of "barba-ruça" shrimp (Artemesia longinaris Decapoda, Penaeidae). MATERIAL E MÉTODOS A confiabilidade da escala cromática utilizada para identificar os diferentes estágios de maturação gonadal das fêmeas de A. longinaris foi obtida pelo exame histológico dos ovários. Classificação macroscópica dos estágios de desenvolvimento gonadal em fêmeas de Artemesia longinaris capturadas entre janeiro de 2002 e janeiro de 2003 no litoral do Rio Grande do Sul. montagem (BELL & LIGHTNER, 1988).
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