Morphometrics and length structure of Micropogonias furnieri (Desmarest, 1823) (Perciformes, Sciaenidae) in Guanabara bay, State of Rio de Janeiro, Brazil
Keywords:
demersal fish, bottom trawl, bycatch, Micropogonias furnieri, length-weight relationship, morphometricsAbstract
The white mouth croaker Micropogonias furnieri is the most common species of Sciaenidae in Guanabara Bay, southeastern coast of Brazil. Data from monthly trawls taken from a shrimp boat between May 2003 and June 2005 showed that white mouth croakers are regularly present year round; the catch was entirely composed of juveniles. The length-weight relationship for pooled sexes was represented by the equation Wt = 0.0053*Lt 3.183. Significant seasonal differences in the condition factor were not observed (p>0.05). Regarding the morphometric characterization of this population stratum, most of the characters examined showed isometric growth, except for Pre-anal Distance, which showed positive allometry, and Eye Diameter, which showed negative allometry. Morphometric aspects of the population in Guanabara Bay seem to be similar to those from coastal populations of southeastern Brazil (population I), which differ from populations on the southern coast.
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