Microdesmus longipinnis (Gobioidei, Microdesmidae): ocorrência, abundância e amostragem em um estuário subtropical

José Maria Souza-Conceição,Micheli Duarte De Paula Costa,Henry Louis Spach,Paulo Ricardo Schwingel

doi:10.4013/nbc.2013.82.07

Abstract

This work describes the first occurrence and abundance of larvae of M. longipinnis (Weymouth, 1910) in the Babitonga Bay estuary, southern Brazil. During an annual cycle (2007-2008), 144 plankton samples with cylindrical-conical net with 50cm in diameter (500?m mesh) and 72 samples with conical plankton net with 40cm in diameter (200?m mesh) were collected at nine stations. In addition, samplings were done with bottom trawl net (12mm mesh) at each station, aiming to collect juveniles and/or adults of M. longipinnis. Larvae occurred from February to May over a broad range area in Babitonga Bay. A total of 7 larvae was collected, with average abundance of 5.4 larvae.100m-³. In sampling with bottom trawl, juveniles and adults were not recorded. Although recorded only in the ichthyoplankton, the results indicate, for the first time, the occurrence of M. longipinnis on the subtropical coast of Brazil, thus enabling a discussion on the ecology and sampling of these fishes with cryptic habits.Key words: Ichthyoplankton, Babitonga Bay, Southwestern Atlantic.

Highlights

The presence of Microdesmidae fishes in Brazil has been described in few studies (Eskinazi, 1972; Dawson, 1973; Lopes et al, 1998, 1999; Castro et al, 2001; Ekau et al, 2001; Marcolin, et al, 2010)
In Brazil, specimens of M. longipinnis have been recorded on the coast of Pernambuco, Espírito Santo, Alagoas and Bahia States (Eskinazi, 1972; Castro et al, 2001; Severi et al, 2008; Marcolin et al, 2010; SIBIP/NEODAT III, 2011)
Despite the fact that a great sampling effort was employed with double trawling hauls during the study period, neither a single young nor an adult individual of M. longipinnis was captured in the entire extension of the main channel of Babitonga Bay, even with different environmental characteristics of each sampling station

Summary

Introduction

The presence of Microdesmidae fishes in Brazil has been described in few studies (Eskinazi, 1972; Dawson, 1973; Lopes et al, 1998, 1999; Castro et al, 2001; Ekau et al, 2001; Marcolin, et al, 2010). In Brazil, specimens of M. longipinnis have been recorded on the coast of Pernambuco, Espírito Santo, Alagoas and Bahia States (Eskinazi, 1972; Castro et al, 2001; Severi et al, 2008; Marcolin et al, 2010; SIBIP/NEODAT III, 2011).

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