Abstract
Fishing selectivity of the mangrove crab Ucides cordatus in the north coast of Brazil can be defined as the fisherman's ability to capture and select individuals from a certain size or sex (or a combination of these factors) which suggests an empirical selectivity. Considering this hypothesis, we calculated the selectivity curves for males and females crabs using the logit function of the logistic model in the formulation. The Bayesian inference consisted of obtaining the posterior distribution by applying the Markov chain Monte Carlo (MCMC) method to software R using the OpenBUGS, BRugs, and R2WinBUGS libraries. The estimated results of width average carapace selection for males and females compared with previous studies reporting the average width of the carapace of sexual maturity allow us to confirm the hypothesis that most mature individuals do not suffer from fishing pressure; thus, ensuring their sustainability.
Highlights
Brazil’s north coast has the largest area of almost uninterrupted mangrove ecosystem in the planet, occupying an area of 11,135.68 km2, with 1,823.00 km2 in Amapá, 3,894.00 km2 in Pará (Kjerfve and Lacerda, 1993), 5,414.31 km2 in Maranhão (Souza-Filho, 2005) and 4.04 km2 in Piauí (Maia et al, 2006).In these environments, the mangrove crab accounts for approximately 63% of the total biomass of mangrove epifauna, which represents 75% of the total fauna biomass (Koch and Wolff, 2002)
The mangrove crab accounts for approximately 63% of the total biomass of mangrove epifauna, which represents 75% of the total fauna biomass (Koch and Wolff, 2002)
The data used in this analysis were part of the databases of the Project ESTATPESCA of IBAMA and Fisheries Statistical Laboratory of the Federal Rural University of Amazonia LAPEP-UFRA, in addition, samplings performed by the authors were used
Summary
Brazil’s north coast has the largest area of almost uninterrupted mangrove ecosystem in the planet, occupying an area of 11,135.68 km, with 1,823.00 km in Amapá, 3,894.00 km in Pará (Kjerfve and Lacerda, 1993), 5,414.31 km in Maranhão (Souza-Filho, 2005) and 4.04 km in Piauí (Maia et al, 2006).In these environments, the mangrove crab accounts for approximately 63% of the total biomass of mangrove epifauna, which represents 75% of the total fauna biomass (Koch and Wolff, 2002). Brazil’s north coast has the largest area of almost uninterrupted mangrove ecosystem in the planet, occupying an area of 11,135.68 km, with 1,823.00 km in Amapá, 3,894.00 km in Pará (Kjerfve and Lacerda, 1993), 5,414.31 km in Maranhão (Souza-Filho, 2005) and 4.04 km in Piauí (Maia et al, 2006). The most recent detailed official statistics per state indicates a production of 59; 2,748; 1,198 and 814 tons of mangrove crab in the states of Amapá, Pará, Maranhão, and Piauí, respectively. This represents 70.7% of the national production, which shows the importance of this resource in Brazil’s north coast (IBAMA, 2007)
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