Navegando por Assunto "Pescada curuca"

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Acesso aberto (Open Access)
Biologia reprodutiva de peixes cianídeos capturados nas proximidades dos terminais portuários do Pará e Maranhão
(Universidade Federal do Pará, 2007) SANTOS, Nayara Barbosa; ROCHA, Rossineide Martins da; http://lattes.cnpq.br/4371300451793081; FRÉDOU, Flávia Lucena; http://lattes.cnpq.br/4779271407117528
Smallscale weakfish (Cynoscion microlepidotus), King weakfish (Macrodon ancylodon) e Pacora (Plagioscion surinamensis) are demersal sciaenids, largely distributed in the Brazilian coast. These species are important fishing resources. This study has the objective of describing aspects of the reproductive biology of these species caught in areas near to the harbors of Itaqui (Maranhão) and Miramar (Pará). For each species, the reproductive stages were macro and microscopically described, the length at first maturity, sexual proportion by month and size, the breeding period and type of spawning was also evaluated. Data were collected in a bimensal basis from December 2005 to October 2006. It was examined 247 individuals of C. microlepidotus, 253 of M. ancylodon and 251 of P. surinamensis. Individuals of C. microlepidotus, M. ancylodon and P. surinamensis measured from 175 to 780 mm, 187 to 399mm and 220 to 590 mm of total length, respectively. The relationship total length (mm) and total weight (g) for females, males e sexes grouped were highly significant for the three species, with negative alometry for C. microlepidotus and positive alometry for M. ancylodon and P. surinamensis. The length of first maturity (L50) for C. microlepidotus, considered grouped sexes was 260.8 mm, 235mm for males and 321mm total of length for females. For M. ancylodon, L50 for grouped sexes was 210.5 mm, 201.6mm for males and 221.8mm for females of total length. For P. surinamensis, L50 for grouped sexes, for males and for females were 279 mm, 305mm and 269mm of total length. Sexual proportion, considering the total number of individuals favored females for M. ancylodon (1male:3female) and favored males for P. surinamensis (2,02male:1female). For C. microlepidotus, male: female proportion was equivalent. Macroscopically, gonads of the three species were classified as Immature (A), Maturing (B), Mature (C) and Spawned/Spent (D), however, when analyzed microscopically, the stage B were sub-divided in initial and final maturing. The macro and microscopical evaluation of gonads indicated a prolonged spawning season, with reported peaks in June- August and December- February, coinciding to the rainfall transition period. The studied species complete their life cycle entirely near the harbors of Itaqui and Miramar, leading these areas to be classified as extremely sensitive especially when referring to possible oil spill.
Acesso aberto (Open Access)
Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil
(2010) SANTOS, Nayara Barbosa; ROCHA, Rossineide Martins da; FRÉDOU, Flávia Lucena
Plagioscion magdalenae (pacora) is a commercially important benthopelagic sciaenid and widely distributed in the Amazon River basin. The present study describes the reproductive biology of this species in the bay of Marajo, Amazon Estuary, Brazil. The gonadal development stage, age and size at first sexual maturity (L50), sex ratio, and reproductive strategy were determined. The data were collected bi-monthly from December 2005 to October 2006. A total of 251 specimens were examined, with the total length (TL) ranging between 220 and 590 mm. The weight-length relationship for females, males and grouped sexes was highly significant, showing a positive allometry. The L50 was of 279 mm for grouped sexes, with 305 mm and 269 mm TL for females and males respectively. The sex ratio for the total number of individuals favored the males (2.02 males: 1 female). Macroscopically, the gonads were classified as immature, maturing, mature and spent. Considering the macro and microscopic evaluation of the gonads, an extended spawning period, mainly in August to February, was observed