Affiliation:
1. Universidade Federal de Pernambuco, Brazil
2. Universidade Federal Rural de Pernambuco, Brazil
3. University of Florida, USA; University of Florida, USA
Abstract
One hundred seventeen specimens of sharks were caught along the coast of Pernambuco State, Northern Brazil, between May 2004 and May 2007, among which 86 were blacknose sharks, Carcharhinus acronotus, enabling a more detailed study of the species. Blacknose sharks were caught in the 2 study areas along the Boa Viagem/Piedade and Paiva beaches, accounting for the highest relative abundance among the species caught (73.5% of total). Potentially dangerous sharks, tiger and bull sharks, were also caught in the same areas, whereas hammerhead and blacktip sharks were only captured off Boa Viagem/Piedade. Concerning the blacknose shark, the total length (TL) ranged from 39.0 to 180.0 cm. Among the 38 females analysed, 32 were juveniles, 11 were maturing, 2 were pre-ovulatory and 21 were pregnant. Sexing was possible for 75 of the 83 embryos, 38 of which were males and 37 were females, with a sex proportion of 1:0.9 and total length ranging between 6.4 and 63.5 cm. Ovarian fecundity ranged from 5 to 10 and uterine fecundity from 1 to 3, with an estimated gestational period of 9 months. Among the 48 males, 6 were juveniles and 42 were adults. Both males and females seem to reach sexual maturity at about 105.0 cm TL. Among the 86 stomachs analysed, only 22.1% had contents, with teleosts as the most frequent item.
Subject
General Agricultural and Biological Sciences
Reference24 articles.
1. Biological notes on the sharks of the north central Gulf of Mexico: Contrib;BRANSTETTER S.;Marine Science,1981
2. FAO Fisheries Technical Paper no. 341;BONFIL R.,1994
3. Estudo Ecológico da Barra das Jangadas;CARNEIRO O.,1960
4. FAO Species Catalogue: Parts 2 Sharks of the world. An annotated and ilustrated catalogue of shark species known to date;COMPAGNO LJV.;FAO Fisheries Synopsis,1984
5. . Reserva ecológica de Dois Irmãos: estudo em um remanescente de Mata Atlântica em área urbana;COUTINHO RQ.,1998
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献