Variação espacial e temporal de bagres marinhos (Siluriformes, Ariidae) na Baía de Sepetiba, Rio de Janeiro

Abstract

Spacial and temporal variation of marines catfishes on Sepetiba Bay, RJ.Marine catfishes (Ariidae) are abundant fishery resource in the Sepetiba Bay, Rio de Janeiro State (Lat. 22º54'-23º04'S; Long. 43º34'-44º10'W), that is considered an important rearing area to a great number of juvenile fish. Artisanal fisheries are important economic activity in the region. Spatial and seasonal distribution and relative abundance of marine catfish, based on the number and weight of fish catched per sample (Catch per Unit Effort = CPUE) were assessed based on 151 otter trawl sampling in seven sampling sites in the Sepetiba Bay, between July 1993 and June 1996. For spatial comparisons, the study area was devised in an inner zone, located in the inner Bay and an outer zone, near to the sea limit. Environmental parameters of surface and bottom water temperature and salinity, transparency and depth were recorded at each sampling. A spatial variation pattern, assessed by multivariate methods, is shown with higher depths and transparencies in the outer bay and lower in the inner bay, while salinity seems to decrease slightly toward the inner bay. Only temperature showed seasonal variation. Five marine catfish species were recorded in the following order of decreasing numerical abundance: Genidens genidens (Valenciennes, 1839), Cathorops spixii (Agassiz, 1829) Sciadeichthys luniscutis (Valenciennes, 1840), Netuma barba (Lacepéde, 1803) and Bagre marinus (Mitchill, 1814).The top four abundant marine catfish occur in higher abundance in the inner Bay, with indication of spatial separation within this area. G. genidens was abundant over all sampling sites in the inner Bay, while C. spixii showed a narrower distribution in this area. N. barba concentrated near to Guandú River estuary, and S. luniscutis showed an ample distribution over all the Bay. Seasonally was not marked for all species. Strategies of spatial separation may be explaining the coexistence of marine catfish in high abundance in the Sepetiba Bay, which is used as fish rearing area mainly due the low depths and transparencies, favorable conditions to their early life cycle development.

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

“…This preference for the inner region has been reported in other studies, such as ARAÚJO et al (1998), AZEVEDO et al (1999), SCHWARZ JR. et al (2007). According to AZEVEDO et al (1999) two demersal fish communities were evident, the inner area of the Sepetiba Bay and the other in the outer zone, with occurrence of G. genidens and C. spixii in the inner and middle area.…”

“…This preference for the inner region has been reported in other studies, such as ARAÚJO et al (1998), AZEVEDO et al (1999), SCHWARZ JR. et al (2007). According to AZEVEDO et al (1999) two demersal fish communities were evident, the inner area of the Sepetiba Bay and the other in the outer zone, with occurrence of G. genidens and C. spixii in the inner and middle area. SCHWARZ JR. et al (2007) also recorded greater abundance of C. spixii in the inner Pinheiros Bay and high occurrence of I. parvipinnis, S. rastrifer and S. brasiliensis in the outermost area, differing from that found in the present study for Sciaenid species.…”

“…In this study, Ariidae was represented by four species, and C. spixii was the most abundant. This is a similar pattern of other estuarine regions in the Brazilian coast (ARAÚJO et al, 1998;AZEVEDO et al, 1999;SCHWARZ JR. et al, 2006;SCHWARZ, JR. et al, 2007;CARVALHO-NETO;CASTRO, 2008;SCHMIDT et al, 2008), as in other tropical regions, such as Mexico (RUEDA; DEFEO, 2003).…”

Biologia reprodutiva de Hexanematichthys proops (Siluriformes, Ariidae) no litoral ocidental maranhense

“…Os bagres Ariidae têm sido amplamente estudados no Brasil em trabalhos que abordam aspectos como alimentação (ARAÚJO, 1984;REIS, 1986;MELO & TEIXEIRA, 1992;PEDRA et al, 2006), distribuição (CRAIG, 1980;MISHIMA & TANJI, 1981;ARAÚJO 1988;AZEVEDO et al, 1999), idade e crescimento (OLIVEIRA & NOVELLI, 2005) e reprodução CHAVES, 1994;GOMES & ARAÚJO, 2004;FÁVARO et al, 2005). Hexanematichthys proops, no entanto, foi muito pouco estudado, a despeito de sua reconhecida importância econômica.…”

Biologia reprodutiva do Bagre bagre capturado pela pescaria de zangaria

“…Esta espécie encontra-se largamente distribuída nas zonas litorâneas e estuarinas tropicais e subtropicais, sendo geralmente abundantes em águas costeiras rasas com fundo lodoso ou arenoso, como estuários e baías (Azevedo, et al, 1999;Absolon & Andreata, 2009). O B. bagre costuma ocorrer ao longo da costa brasileira e apresenta grande importância nas pescarias artesanais (Sousa et al, 2013;Pinheiro-Sousa et al, 2015), especialmente nas regiões norte e nordeste.…”