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

Abstract

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.

Histological and histochemical analysis of the gonadal development of males and females of Armases rubripes (Rathbun 1897) (Crustacea, Brachyura, Sesarmidae)

“…This has also been observed for M. acanthurus (Carvalho and Pereira, 1981). Dumont and D'Incao (2004) observed changes in the ovaries from stage I (immature) to stage II (incipient maturation) regarding the increase in cell size and cell weight and the start of the production of yolk.…”

“…According to Hartnoll (1974), the consecutive changes observed during gonadal development are important, because besides enabling an estimate of physiological sexual maturity (Oshiro et al, 1999;Silva and Oshiro, 2002a, b;Cobo and Fransozo, 2003), they permit detailed visualization of the reproductive cells (Dumont and D'Incao, 2004). Furthermore, these modifications are indispensable to characterize the reproductive dynamics and to manage adaptations for the preservation and/or commercial exploitation of the populations.…”

Population biology of shrimp Artemesia longinaris (Crustacea: Decapoda: Penaeidae) from the southern coast of Brazil

“…Ovaries categorized as immature ranged from thin, transparent strands to thicker ones. Mature ovaries were much larger and thicker, and varied from yellow to light orange or light green, and green to olive-green (Dumont & D'Incao, 2004). Size -frequency distributions were constructed separately to estimate the seasonality for males and females, using 10-mm TL size-intervals.…”

Reproductive Pattern, Size at First Maturity and Stock-Recruitment Relationships of the Argentine Stiletto Shrimp (Artemesia Longinaris, Decapoda: Penaeidae) in Southern Brazil

“…Few previous investigations concerned on the reproduction and ovary maturation of A. longinaris from Southern Brazil (Nascimento 1981, Dumont & D´Incao 2004, Castillo et al 2007. Using variation of size at first maturity, a hypothesis of two different populations was stated for this species (Nascimento 1981).…”

“…However, the trait used to define morphological maturity was the presence of a spermatophore, which is presently known to be invalid as an indicator of ovarian maturity for this species, since females can carry spermatophores without being fully mature (Scelzo 1991). Dumont & D´Incao (2004) established a chromatic scale, based on ovarian microscopic traits, to identify stages of gonadal development of A. longinaris more accurately, providing a routine method to classify the ovaries. Recently, Castillo et al (2007) investigated trends in size at first maturity in populations inhabiting distribution limits of the species.…”