Navegando por Assunto "Peixes marinhos"

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Biologia reprodutiva e ecologia trófica do peixe Larimus breviceps (Perciformes: Sciaenidae) no litoral da Paraíba
(2021-01-29) Silva, Lucas Vinícius Santos; Frédou, Flávia Lucena; http://lattes.cnpq.br/4779271407117528; http://lattes.cnpq.br/5258131874570501
The shorthead drum Larimus breviceps is one of the main bycatch species of the shrimp fisheries in Brazil. However, studies addressing the biology and fisheries impacts on this species are still scarce (e.g., macroscopic, and microscopic ovarian maturation, oocyte development, seasonal variation in the diet, morphometric attributes, isotope analysis). Here, we describe the main aspects of the reproductive biology and the feeding ecology of L. breviceps on Paraíba, northeast Brazil. A total of 970 individuals (549 females and 421 males) were caught between December 2016 and November 2017 through a beach seine. The total length (TL) varied from 4.2 to 23.0 cm. Females dominated over males (1 female: 0.77 male). The gonads were described by macroscopic and microscopic analysis. The ovaries were composed by oogonia, pre-vitellogenic, vitellogenic, mature and atretic oocytes. Thereafter, the following stages were thus defined for females: immature, initial development, advanced development, mature and regressing. The period of highest reproductive activity occurs between November and March and immature individuals occur throughout the year. The mean length at first maturity (L50) was 11.1 cm TL. To the feeding ecology study, a subsample of 419 stomachs were analyzed. The total length (TL) varied between 6.3 and 19.2 cm. Nine feeding categories were defined for L. breviceps. Sergestidae was characterized as the main prey (IAi=83%). The diet composition displayed a different pattern for juveniles and adults. Significant differences were found for peduncle flatness index and body flatness index in 49 individuals (27 juveniles and 19 adults); indicating that adults are faster swimmers than juveniles. A total of 40 individuals (dry season = 20; rainy season = 20) were selected for stable isotope analysis. Differences were found in δ13C values for different size classes in the dry season, with juveniles feeding on preys with higher δ13C levels than the adults. The shorthead drum had a trophic level between the third and fourth position, classifying the species as a carnivore predator. The information provided here contributes to the overall knowledge of this species and may be useful for further development of management practices that ensure sustainability of marine species exploitation.
Diferenças na relação peso/comprimento para a sardinha-bandeira, Opísthonema oglinum (Le Sueur, 1817) (Pisces-Clupeidae), nas regiões Nordeste (Pernambuco) e Sudeste (São Paulo), Brasil
(1987) Couto, Libânia Maria Maia Rodrigues; Vasconcelos Filho, Antônio de Lemos; Lima, Alcy Menezes de
Apresenta-se neste trabalho, a relação peso/comprimento da Sardinha-bandeira, Opísthonema oglinum (Le Sueur, 1817), comparando-se esses resultados com os obtidos para a mesma espécie nas costas Sudeste e Nordeste do Brasil. Observou-se que a Sardinha-bandeira encontrada no Canal de Santa Cruz apresenta-se, para uma mesma classe de comprimento, mais pesada que a sardinha encontrada na costa Sudeste (São Paulo).
Obtenção e caracterização físico-química e nutricional de concentrado proteico oriundo de resíduos de filetagem de saramunete, Pseudupeneus maculatus (Bloch, 1793)
(2024-06-06) Amaral, Rodrigo Pinheiro Crasto; Oliveira Filho, Paulo Roberto Campagnoli de; http://lattes.cnpq.br/8043850276929205; http://lattes.cnpq.br/5798261290131048
The aim of the present study was to obtain and characterize the protein concentrate of saramunete filleting waste, Pseudupeneus maculatus. Two types of saramunete protein concentrate (CPS) were developed, type A and type B, which can be differentiated by color and odor, evaluating yield, pH, water activity, chromatic coordinates, volatile nitrogen bases, humidity, protein, fat and ash.. The type A saramunete protein concentrate showed lower yield, despite being more acidic (lower pH) and higher L* value (brightness), lower a* value (red/green) and higher b* value (yellow/blue) than CPS type B. The water activity, moisture percentage and volatile nitrogen bases of CPS were low and with no difference between treatments. CPS type A had a higher percentage of protein, indicating better protein quality. Furthermore, it presented a lower amount of lipids, indicating that it is less susceptible to lipid oxidation. Therefore, type A CPS is a good way to add value to saramunete waste as it presents a good CPS yield, appreciable physical-chemical characteristics and nutritional aspects compatible with other fish protein concentrates, having potential for use in food products.
Ocorrência de Brotula Barbata (Bloch & Schneider), fisces, brotulidae, na costa do Nordeste Brasileiro
(1977) Koike, Johei; Guedes, Dinalva de Souza; Lima, Maria de Jesus A.
One specimen of Brotula Barbata (Bloch & Shaneider) has been captured in Pernambuco Statet, in january 1976, for the first time on a brasilian coast by a fishing regional boat, only three examples have been reported throughout all coast of the South America: 2 in Venezuelaand 1 in Surinam, The specimen measured 550.0 mm in total lenght and 1.550,0 g in weight. All of the caracteristics, including dental formula of upper mandible coincide with discription by Osuna & CERVIGON (1988), No comonname is used in Brasil whereas " Brotula" is used in other Latin American nations.
Sobre a biologia da sardinha-bandeira Opisthonema oglinum (le sueur, 1817), no canal de Santa Cruz, PE
(1986) Couto, Libânia Maria Maia Rodrigues; Vasconcelos Filho, Antônio de Lemos
Apresenta-se, alguns aspectos da biologia da Sardinha-Bandeira, Opisthonema oglinum (Le Sueur, 1817), do Canal de Santa Cruz-Pernambuco-Brasil. Foi determinado o período de reprodução da espécie, observando-se que a mesma desova próximo aos locais das capturas, durante os meses de novembro a março, com maior intensidade no período de dezembro a fevereiro. Observou-se um predominio de fêmeas durante todo o período estudado, sendo a razão entre os sexos 1 M : 5,4 F. A Sardinha-Bandeira apresenta um hábito alimentar (essencialmente) planctófago, notadamente zooplanctônico e secundariamente fitoplanctônico; ocasionalmente, as sardinhas adultas complementam sua alimentação com organismos do nécton e/ou mesmo do bentos. Considerando-se os sexos e os estádios de maturação, não houve diversificação na dieta alimentar destes clupeídeos.