Resumo
This paper presents results obtained in analysis of the data on catch and effort, for croaker (Micropogon furnieri) caught along the southern coast of Brazil, between 23º50'S and 35ºS, in a band of approximately 30 nautical miles, and landed at Santos from January 1959 to December 1962. The unweighted and weighted indexes of density and the concentration index were computed according to gear and to fishing area (I - from 23º50'S to 26ºS, and II - from 26ºS to 35ºS) and the data were grouped by quarters. The results suggest the following conclusions: 1) The croaker catch, to some extent, has been done without directive thus the fishing fleet has operated in the areas with density lower than average. 2) The level of unit-effort production differ largely between areas, suggesting the presence of two separate croaker populations. 3) The decrease in production per unit-effort year after year in the two areas, suggests a decrease in the relative abundance along the studied fishing area.
Análise da pesca da corvina na costa centro-sul do Brasil
A. E. A. de M. VazzolerI; E. M. de SáII
IInstituto Oceanográfico da Universidade de São Paulo. Membro do Grupo de Pesquisas sôbre a Pesca Marítima (G.P.P.M.)
IIDepartamento da Produção Animal da Secretaria da Agricultura. Membro do Grupo de Pesquisas sôbre a Pesca Marítima (G.P.P.M.)
SUMMARY
This paper presents results obtained in analysis of the data on catch and effort, for croaker (Micropogon furnieri) caught along the southern coast of Brazil, between 23º50'S and 35ºS, in a band of approximately 30 nautical miles, and landed at Santos from January 1959 to December 1962.
The unweighted and weighted indexes of density and the concentration index were computed according to gear and to fishing area (I - from 23º50'S to 26ºS, and II - from 26ºS to 35ºS) and the data were grouped by quarters.
The results suggest the following conclusions:
1) The croaker catch, to some extent, has been done without directive thus the fishing fleet has operated in the areas with density lower than average.
2) The level of unit-effort production differ largely between areas, suggesting the presence of two separate croaker populations.
3) The decrease in production per unit-effort year after year in the two areas, suggests a decrease in the relative abundance along the studied fishing area.
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Full text available only in PDF format.
BIBLIOGRAFIA
(Recebido em 10/10/1963)
Publ. nº 192 do Inst. Ocean. da USP.
Contr. nº 27 do G.P.P.M.
- BRAGA, A. DA S. 1961. Estudos sobre o desenvolvimento da pesca marítima motorizada no Estado de São Paulo. Bol. Ind. Anim., n.s., vol. 19, n.ş único, p. 33-49.
- GULLAND, J. A. 1959. A study of fish populations by the analysis of commercial catches. Rapp. Proc. Verb. Réun., Cons. Int. Explor. Mer, vol. 140, n.ş 1, Contr. n.ş 2, p. 21-29.
- RICHARDSON, I. D. & MORAES, M. N. DE 1960. A first appraisal of the landing and mechanism of the Santos fishery. Bol. Inst. Ocean., vol. XI, n.ş 1, p. 5-86.
- RICHARDSON, I. D. & SANTOS, E. P. DOS 1962. Note on the selectivity of meshes used by Santos fishing fleet. Bol. Inst. Ocean., vol. XII, n.ş 1, p. 33-35.
- VAZZOLER, A. E. A. DE M. 1963. Deslocamentos sazonais da corvina relacionados com as massas de água. Contr. Avul. Inst. Ocean., Ocean. Biol., n.ş 5.
Datas de Publicação
-
Publicação nesta coleção
13 Jun 2012 -
Data do Fascículo
1963
Histórico
-
Recebido
10 Out 1963
