Affiliation:
1. Universidade de São Paulo, Brasil
2. University of Massachussets, USA
Abstract
Abstract 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.
Reference51 articles.
1. The response of fish larvae to decadal changes in environmental forcing factors off the Oregon coast;AUTH T. B.;Fish. Oceanogr.,2011
2. Selectivity of towed-net samplers;BARKLEY R. A.;Fish. Bull.,1972
3. Passive and active behavioural contributions to patchiness and spatial pattern during the early life history of marine fishes;BRADBURY I. R.;Mar. Ecol. Prog. Ser.,2003
4. Interannual variations in zooplankton biomass in the gulf of Alaska, and covariation with California current zooplankton biomass;BRODEUR R. D.;CalCOFl Rep,1996
5. A prospecção pesqueira e abundância de estoques marinhos no Brasil nas décadas de 1960 a 1990: levantamento de dados e avaliação crítica;CASTELLO J.P.,2007
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