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vol.63 número2Tidal effects on short-term mesozooplankton distribution in small channels of a temperate-turbid estuary, Southwestern AtlanticJuvenile fish use of the shallow zone of beaches of the Cananéia-Iguape coastal system, southeastern Brazil índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Journal of Oceanography

versão impressa ISSN 1679-8759versão On-line ISSN 1982-436X

Resumo

FAVERO, Jana Menegassi del; KATSURAGAWA, Mario; ZANI-TEIXEIRA, Maria de Lourdes  e  TURNER, Jefferson T.. Comparison of the effects of two bongo net mesh sizes on the estimation of abundance and size of Engraulidae eggs. Braz. j. oceanogr. [online]. 2015, vol.63, n.2, pp.93-102. ISSN 1679-8759.  http://dx.doi.org/10.1590/S1679-87592015081206302.

Studies of ichthyoplankton retention by nets of different mesh sizes are important because they help in choosing a sampler when planning collection and the establishment of correction factors. These factors make it possible to compare studies performed with nets of different mesh sizes. In most studies of mesh retention of fish eggs, the taxonomic identification is done at the family level, resulting in the loss of detailed information. We separated Engraulidae eggs, obtained with 0.333 mm and 0.505 mm mesh bongo nets at 172 oceanographic stations in the southeastern Brazilian Bight, into four groups based on their morphometric characteristics. The difference in the abundance of eggs caught by the two nets was not significant for those groups with highest volume, types A and B, but in type C (Engraulis anchoita), the most eccentric, and in type D, of the smallest volume, the difference was significant. However, no significant difference was observed in the egg size sampled with each net for E. anchoita and type D, which exhibited higher abundance in the 0.333 mm mesh net and minor axis varying from 0.45-0.71 mm, smaller than the 0.505 mm mesh aperture and the mesh diagonal.

Palavras-chave : Ichthyoplankton; Engraulis anchoita; Mesh size; Capture Efficiency; SE Brazil.

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