Length-weight relationships of fish from sandy beaches.

D Olentino,M D P Rocha,K C Yamamoto,T Gomes,J F Silva,C C F Lubich,J H N Santos,H Beltrão

doi:10.1590/1519-6984.250003

D Olentino, M D P Rocha + Show 6 more

Open Access

https://doi.org/10.1590/1519-6984.250003

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Abstract

This study estimated the length-weight relationships of 16 fish species occurring close to the shores of sandy beaches along the lower Negro River basin, Brazilian Amazon. The specimens were captured for one day each month, in October to November 2016, early in the morning and early evening, using trawl net (20 m taken for standard length (SL - 0.1 cm precision) and total weight (TW - 0.01 g precision). The parameters a and b of the equation WT = a.LTb were estimated. The a values ranged from 0.0018 to 0.0226 and b values ranged from 2.5271 to 3.3244. This study also provides new data on of maximum lengths for six species, Amazonsprattus scintilla, Brycon pesu, Moenkhausia megalops, Pachyurus paucirastrus, Reganella depressa and Trachydoras microstomus, and new reports of the LWRs parameters of 15 fish species.

Highlights

The Negro River is one of the main tributaries of the Amazon River (Junk et al, 2015), and its diversity of fish is among the richest so far reported in the world (Roberts, 1972; Saint-Paul et al, 2000; Soares and Yamamoto, 2005)
These areas are susceptible to flooding during periods of high water and contribute to the migration of fish species, while in the low water period the areas close to their shores are key shallow aquatic environments due to their provision of shelter for many species
The present study describes the LWRs parameters of 16 fish species collected close to sandy beaches along the lower Negro River basin in the Brazilian Amazon

Summary

Introduction

The Negro River is one of the main tributaries of the Amazon River (Junk et al, 2015), and its diversity of fish is among the richest so far reported in the world (Roberts, 1972; Saint-Paul et al, 2000; Soares and Yamamoto, 2005). The sandy beaches deserve a special mention since they are subjected to the flood pulse. These areas are susceptible to flooding during periods of high water and contribute to the migration of fish species, while in the low water period the areas close to their shores are key shallow aquatic environments due to their provision of shelter for many species

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