TCC - Engenharia de Pesca (Sede)
URI permanente para esta coleçãohttps://arandu.ufrpe.br/handle/123456789/439
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Resultados da Pesquisa
Item Ecomorfologia e papel do ambiente de zona de arrebentação nos estágios de vida iniciais de espécies de Clupeiformes em uma praia arenosa tropical brasileira(2021-09-30) França, Vinícius Fellype Cavalcanti de; Severi, William; http://lattes.cnpq.br/0914569737947285; http://lattes.cnpq.br/8439327285134607Surf zones are environments with a huge importance for the early life stages of several fish species for presenting characteristics such as the high phytoplanktonic activity providing an elevated availability of food and their physical factors such as the wave actions that supply a great nutrient cycling and increases the turbidity featuring the surf zones ideal nursery environments for diverse species of fish for allow its development, among which, those of the clupeiforms order are included. The clupeiform fishes have a great ecological and economic importance for being abundant fish in tropical sandy beaches surf zones with significant fisheries importance. Studies about their feeding ecology and environment utilization are relevant and one of the methods for the construction of this knowledge is the application of ecomorphological analyses, which turns possible the understanding of the species ecological interactions and their adaptations. 10 ecomorphological variables were analyzed of individuals belonging to the species Anchoa tricolor, Anchoa januaria, Anchovia clupeoides, Anchovia lepidentostole, Lycengraulis grossidens, Chirocentrodon bleekerianus, Harengula clupeola and Opisthonema oglinum whose values were employed in a principal component analysis (PCA) with the two first axis explaining 60,71% of the total variance. It was observed a high morphological overlap between the species of Engraulidae with the exception of A. clupeoides, which differed from the others for presenting higher values of the compression index and caudal peduncle compression index. The Clupeidae species differed from the other families due to its big values of relative height and relative head length that also showed differences between the species themselves, having Harengula clupeola presented the highest values of these variables. The representative of the Pristigasteridae showed intermediate overlap between the other families because it is a compressed specie but with low scores of relative height, caudal peduncle relative length and mouth aspect ratio. The morphological differentiation between the families and even between specimens from a same family indicated niche divergences, showing that besides their phylogenetically proximity there are differences in their ecological interactions turning possible their coexistence.Item 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/5258131874570501The 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.Item Influência do alimento inerte durante a fase de pré-cultivo de larvas do camarão pitu Macrobrachium carcinus (Linnaeus, 1758)(2018) Bezerra, Bartolomeu José Lemos; Correia, Eudes de Souza; http://lattes.cnpq.br/1573696341397169; http://lattes.cnpq.br/1846481863094619