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The spawning and early life stages of Cetengraulis edentulus (Cuvier, 1824) (Pisces, Engraulidae) in a fixed point in Guanabara Bay (RJ - Brazil)


The spawning and early life stages of Cetengraulis edentulus (Cuvier, 1824) (Pisces, Engraulidae) in a fixed point in Guanabara Bay (RJ - Brazil)



Revista Brasileira de Biologia 54(2): 199-209



ISSN/ISBN: 0034-7108

The seasonal distribution of fish eggs and early life stages of Cetengraulis edentulus was observed. The ichthyoplankton were sampled in intervals of three months between October/1986 and July/1987, in the central channel of Guanabara Bay, in two tidal cycles during 24 hours. Horizontal hauls were made with a 500 mu-m mesh Hensen net, equipped with a calibrated flowmeter. Data on temperature and salinity were measured together with the samples. Engraulidae eggs were the most abundant. About three thousand eggs of this family were measured, considering the major and minor axes. The volume (size) and eccentricity (shape) were calculated. The spawning of two Engraulidae fish species was identified by their different volumes. The smaller eggs were identified as Cetengraulis edentulus and their volumes ranged from 0.18 to 0.34 mm-3 eccentricity of the two groups of eggs was similar, with both ranging from 0.74 to 0.94. The results obtained from the material analysed of C. edentulus suggested a spawning peak in the winter season between midnight and three A.M. The eggs completed its embryonic development in about twenty-four hours.

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Accession: 021988079

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