Abstract
C. edentulus accounts for the major fishery resource in Guanabara Bay, but there are only few studies about its captures.This study analyzed the long term changes on C. edentulus catches in Guanabara Bay, focusing especially on temporal variation on capture effort, boat storage temperature, and fish price and size.We assessed the 2002-2011 database of fish landings at the pier of Rubi S.A., with records of year, month, total catch (kg), number of fish per kg, boat storage temperature (OC), and price per kg to boat owner (US$). Those variables differed among years and months (ANOVA; p<0.01) with strong yearXmonth interactions for all, probably related to C. edentulus reproductive and recruitment seasons and environmental conditions of Guanabara Bay. Generalized additive models revealed that high C. edenuldus catches were associated with few boat loadings of large-sized fishes, which were conserved in higher boat storage temperatures and attained high market prices. Our long-term study stressed that variations on C. edentulus fishery were related to changes on boat storage temperature, fish size, price paid per kg, and frequency of landings, and that these descriptors are correlated with C. edentulus ecological traits and high phytoplankton availability. Nevertheless, further studies should be performed to address whether less evident factors, such as the fluctuation of concurrent Sardinella brasiliensis stock, would explain the termporal dynamics of C. edentulous stocks in Guanabara Bay.
Highlights
(Silva, Araújo, Azevedo, & Mendonça, 2003)
C. edentulus began to be used as human food and fish meal since early 1980s, in part due to declining stocks of other traditionally exploited species, such as Sardinella brasiliensis (Whitehead et al, 1988; Jablonski et al, 2006), currently accounting for the major fishery resource in coastal bays of Rio de Janeiro, Southeastern Brazil (Araújo et al, 2008)
This study aims to analyze the long term changes on C. edentulus catches in Guanabara Bay, focusing especially on temporal variation on capture effort, boat storage temperature, and fish price and size between 2002 and 2011
Summary
(Silva, Araújo, Azevedo, & Mendonça, 2003). Adults perform seasonal migrations between estuarine and oceanic areas (MacGregor & Houde, 1996), aggregating in large shoals frequently targeted by commercial fisheries. C. edentulus first matures at 118mm total length (L50 for both sexes), reaching 200mm at maximum (Silva et al, 2003; Souza-Conceição, Rodrigues-Ribeiro, & Castro-Silva, 2005) This species feeds mainly on phytoplankton and is widely tolerant to changes in environmental conditions (Krumme, Keuthen, Barletta, Saint-Paul, & Villwock, 2008; Giarrizzo & Krumme, 2009).It is often associated with muddy substrates of inner bay zones, where salinity is low, temperatures are high, and phytoplankton biomass is high due to the great input of organic waste (Sergipense, Caramaschi, & Sazima, 1999; Gay, Sergipense, & Rocha, 2000; Silva et al, 2003; SouzaConceição et al, 2005; Araújo, Silva, Santos, & Vasconcellos, 2008). The dynamics of C. edentulus catches in Guanabara Bay is barely known, especially in relation to interannual population trends and seasonal fluctuations on its capture. This study aims to analyze the long term changes on C. edentulus catches in Guanabara Bay, focusing especially on temporal variation on capture effort, boat storage temperature, and fish price and size between 2002 and 2011
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