USE OF ARTIFICIAL COLLECTORS TO OBTAIN OYSTER SEEDS IN BABITONGA BAY, SANTA CATARINA, BRAZIL

Cláudio Rudolfo Tureck,Adriano Weidner Cacciatori Marenzi,Cristiano Lazoski,Carlos Henrique Araujo De Miranda Gomes,Claudio Manoel Rodrigues Melo,João Paulo Ramos Ferreira,Jaime Fernando Ferreira

doi:10.20950/1678-2305.2020.46.1.541

Abstract

The aim of this study was to evaluate oyster seed settlement pattern in artificial collectors affixed along Babitonga Bay (26Â°28ââ‚¬â„¢S í 48Â°50ââ‚¬â„¢W), Santa Catarina state, Brazil. Artificial collectors were installed in the upper tidal range (supralittoral), in the line of intermediate variation of the tide (mesolittoral), and below the limit region of the low tide (infralittoral). A total of 7,579 seeds were obtained over a year, presenting clear variations of quantities and species according to the seasons, depths and collection sites. Among the total number of seeds collected, 284 were submitted to molecular analyses for species identification, among which 5.63% belonged to Crassostrea gasar, 16.9% to C. rhizophorae, 0.35% to C. gigas, 24.29% of Ostrea sp. and 52.81% to C. talonata. Species identification through morphological analysis is difficult because of the inherent polymorphism of shells. Results demonstrate that artificial collectors present a higher performance for the settlement of oyster species inappropriate for farm cultivation (C. talonata and Ostrea sp.). Moreover, C. talonata is an exotic species from Indo-Pacific seas recently confirmed along Brazilian coasts, and it already possesses a high recruitment rate in the estuarine region. This raises environmental and commercial concerns about the maintenance of the natural oyster population in Babitonga Bay.

Highlights

The collection of native oyster seeds in the natural environment for cultivation purposes has already been used in some brazilian regions such as the estuarine complex-lagoa de Iguape‐Cananéia‐Paranaguá (Pereira et al, 2003)
Among the total number of seeds collected, 284 were submitted to molecular analyses for species identification, among which 5.63% belonged to Crassostrea gasar, 16.9% to C. rhizophorae, 0.35% to C. gigas, 24.29% of Ostrea sp. and 52.81% to C. talonata
A total of 284 seeds were analyzed genetically, and 52.81% of them were identified as Crassostrea talonata, 16.9% as C. rhizophorae, 5.63% as C. gasar, 24.29% as Ostrea sp. and 0.35% as C. gigas (Table 2)

Summary

Introduction

The collection of native oyster seeds in the natural environment for cultivation purposes has already been used in some brazilian regions such as the estuarine complex-lagoa de Iguape‐Cananéia‐Paranaguá (Pereira et al, 2003). Each one possesses different growth rates, but similar continuum of morphological variation. This complicates the organization and cultivation of seeds and adults (Absher, 1989; Nascimento, 1991; Pereira et al, 2003; Galvão et al, 2009; Melo et al, 2010b; Lazoski et al, 2011). Several authors have demonstrated the technical viability of Brazilian native oyster cultivation, highlighting plasticity in growth rates (Lima and Vazzoler, 1963; Singarajah, 1980; Nascimento, 1983; Ramos et al, 1986; Pereira et al, 1988; Absher, 1989; Pereira and Soares, 1996; Pereira, 1997; Pereira et al, 2001; Maccacchero et al, 2005, Galvão et al, 2009; Lopes et al, 2013; Legat et al, 2017)

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Conclusion