Análise da pesca da pescada-foguete na costa centro-sul do Brasil

Abstract

SYNOPSISIn this p"aper data on catch and effort by gear are analysed, for weakfish (Macrodon ancylodon ) landed at Santos from January 1959 to December 1963. The region studied was a narrow band , about 30 natitical miles wide, along the southern coast of Brazil, between 23° S and 34° S.From the analysis of monthly data of pI'oduction per unit-effort by -squares of 1° on a side, we divided the studied region in two areas: area I (from 23° S to 27° S) and area II (from 28° S to 34° S). The index of unit-effort production and the effort concentration index were computed grouping the data by quarters.! From the results we may drow the following conclusions:1 -In a general way, thé effort for catch weak-fish has been applied satisfactorily because the ·.medium and large parejas have operated almost in areas with average density on' higher than average density; 2 -The production per unit-effort in the area I is smaller than the production in area lI, which suggests that the ' index of abundance is higher in area lI; 3 -The decrease in production per unit-effort, in are a lI, suggests a decrease in the abundance or availability of weak-fish in this area; 4 -In the area I, the index of production per unit-effort remained approximately at the same leveI. INTRODUÇÃONeste trabalho são apresentados os resultados da análise dos índices de produção da pescada-foguete por unidade de esfôrço e dos índices de concentração· de esfôrço; a finalidade foi determinar Publ. n o 218 do Inst. Oceano da USP.

Age and changes in growth of the king weakfish Macrodon atricauda (Günther, 1880) between 1977 and 2009 in southern Brazil

“…In southern and southeastern Brazil, M. atricauda has been a major target of the bottom trawl fishery since the late 1950s (Yamaguti and Moraes, 1965;Yesaki and Bager, 1975;Valentini et al, 1991;Haimovici, 1998;Carneiro and Castro, 2005). It has also been fished in Uruguay and Argentina (Cousseau and Perrota, 1998).…”

Density‐dependent changes in the feeding behaviour of Macrodon atricauda of southern Brazil

“…The sciaenid M. atricauda inhabits shallow coastal waters from Espírito Santo state in south‐eastern Brazil down to northern Argentina. From the five genetically distinct populations of M. atricauda (Rodrigues et al ., ), the most abundant inhabits southern Brazil, between Chui and Cape Santa Marta Grande (28° 0′ S–34° 40′ S), where it has been exploited by the industrial bottom pair‐trawl fishery since the late 1950s (Yamaguti & Moraes, ; Haimovici, ).…”

Long-term changes in the age structure, mortality and biomass of the king weakfish Macrodon atricauda (Günther, 1880) in southern Brazil: Is it resilient enough to avoid collapse?

“…36 • ) estuary and Santa Marta Grande Cape in southern Brazil (Lat. 28 • ), where it has been one of the major targets of the pair-bottom trawl fishery since the late 1950s (Haimovici, 1998;Valentini et al, 1991;Yamaguti and Moraes, 1965;Yesaki and Bager, 1975).…”