Biologia reprodutiva dos bagres marinhos Genidens genidens (Valenciennes) e Cathorops spixii (Agassiz) (Siluriformes, Ariidae), na Baía de Sepetiba, Rio de Janeiro, Brasil

Abstract

ABSTRACT. Reproductive biology of the marine catfish Genidens genidensValenciennes and Cal"orops spixii Agassiz (Siluriformes, Ari idae) in the Sepetiba Bay, Rio de Ja neiro, Brazil. The reproductive cycle ofthe marine catfishes Genidens genidens Valenciennes, 1833 and Calhorops spixii Agassiz, 1839 in the Sepetiba Bay, was assessed by an annual period of sampling from October 1993 to September 1994. The fishes were caught by standardized otter trawl and environmental parameters of tel11perature, salinity and transparency ofwater were recorded at each sampling. Five gonadal phases were described, based in macroscopic observations. Changes in the gonadosomatic index (GS1) and in the percentual of stages of gonadal development showed that G. genidens spawns in Summer/early Autul11n, coinciding with low salinity and high temperature and transparency. Calhorops spixii spawns in late Spring/early Summer, coinciding with rising temperature and transparency and low salinity. Total spawning are shown for both species, as indicated by length-trequency of oocytes per stages of l11aturation with two groups synchronic development of oocytes. Fecundity is low (10-23 oocytes, for G. genidens and 24-30 for C. spixii), when compared with other teleosteans, and was not strongly correlated to the total length (G. genidens, r=0.65, C. spixii, r=0.76). Strategy-k is developed by both species as indicated by high brood and enbrions protection and high body length. KEY WORDS . Siluriformes, Ariidae, reproduction, Marine Cattish, Sepetiba Bay Os bagres marinhos pertencentes à família Ariidae ocorrem em zonas litorâneas sendo geralmente mais abundantes em águas costeiras pouco profundas, em fundo lodoso ou arenoso (.ARAúJO 1988; ANDREATA et aI. 1989). São considerados como recursos de grande importância econômica na pesca artesanal, principalmente na região sul (REIS I 986a). Na época da desova, procuram a desembocadura dos rios e regiões lagunares realizando incubação oral com machos e raramente as fêmeas, carregando ovos e formas iniciais da prole até completarem o desenvolvimento embrionário (Y ANEZ-ARANCIBIA & SANCHEZ-GIL 1988;REIS 1986b).A biologia reprodutiva deste grupo de peixes é pouco estudada na costa do Brasil e isto faz com que especial interesse seja direcionado para as espéciesGenidens genidens e Cathorops spixii devido sua grande distribu ição em estuários

Accumulation and distribution of metals in the tissues of two catfish species from Cananéia and Santos-São Vicente estuaries

“…spixii spawns in late spring/early summer, has total spawning with synchronic development of oocytes, and lower fecundity than that of other fish (GOMES et al, 1999;FÁVARO et al, 2005). Concerning the hepatic somatic index (HSI) and condition factor (CF), the lack of evidence of sexual maturity in both Ariidae catfish species may explain the similar values found for these indices.…”

Analysis of reproductive patterns of fishes from three Large Marine Ecosystems

“…We can infer that this change in GSI values for M. ancylodon in the North Brazil Shelf may be attributed to fishing pressure, as this species has a high commercial importance in this area (Camargo and Isaac, 2005;Santos, 2007). The larger differences found for marine catfishes, Cathorops spixii and Genidens genidens, are associated with the reproductive behavior of these two species, as the large oocyte size is related with the low fecundity and parental care (Vazzoler, 1996;Gomes et al, 1999;Favaro et al, 2005). On the other hand, Elagatis bipinnulata had a completely inverse pattern with a GSI of 33.8 for males and 31.8 for females (equation b).…”

Reproductive biology of the flatfish Etropus crossotus (Pleuronectiformes: Paralichthyidae) in the Paranaguá Estuarine Complex, Paraná State, subtropical region of Brazil

“…According to Patiño & researchers that work with estuarine species in the tropical region of Brazil (Barbieri et al, 1991;Gomes et al, 1999;Pessanha & Araujo, 2001). According to Lowe-McConnell (1999), and corroborating the presumptions above, the reproduction period occurs at different times along the The results found for both sexes of E. crossotus, with the obtainment of individuals with mature, spawned/spermiated and immature gonads, consistently support the assertion that the species uses the study area for reproduction and recruitment.…”