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Length‐weight relationship of 16 fish species from the Negro River basin (Amazonas state, Brazil)
Author(s) -
Lubich C. C. F.,
AguiarSantos J.,
Freitas C. E. C.,
SiqueiraSouza F. K.
Publication year - 2021
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.14112
Subject(s) - tributary , biology , morning , evening , fish <actinopterygii> , fishery , freshwater fish , drainage basin , zoology , ecology , geography , cartography , botany , physics , astronomy
Summary This study aimed to estimate the parameters of length‐weight relationship for 16 freshwater fish species that inhabit the Aracá and Demeni Rivers, which are two tributaries of the Negro River (Amazonas state, Brazil). The fishes were sampled using gillnets (15 × 2 m, mesh size 30–120 mm between opposite knots), during 6 days each year, in April 2016, November 2018 and April 2019. The gillnets were placed in the river twice each day; in the morning (5–9 a.m.) and in the evening (5–9 p.m.), with a standardized time of 4 hr. Measurements were 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 W T = a .L T b were estimated. This study also provides new data on of maximum lengths for six species, namely, Argonectes longiceps , Hemiodus atranalis , Chalceus erythrurus , Astrodoras asterifrons , Trachydoras steindachneri and Acarichthys heckelii .