diet and feeding of the cutlassfish trichiurus lepturus in the subtropical convergence ecosystem of southern brazil

Abstract

The diet and feeding of the cutlass¢sh Trichiurus lepturus were studied based on analyses of the stomach contents of larvae, juveniles, and adults collected along the continental shelf and shelf break o¡ southern Brazil, from the Cape of Santa Marta Grande (28836 0 S) to Chu|¤ (34845 0 S). The larvae and pre-juveniles with a total length of 55 cm were found to have fed almost exclusively on calanoid copepods, whereas juveniles (5 to 30 cm) fed on small zooplanktonic crustaceans such as Lucifer faxoni and Promysys atlantica. On the other hand, sub-adults (30 to 70 cm), fed on euphausiids, mainly Euphausia similis, and small ¢sh, mostly anchovy Engraulis anchoita. Adults (70 to 160 cm) fed on a wide range of larger prey, such as anchovy, sciaenid ¢sh, cephalopods and coastal shrimps, as well as euphausiids. The juveniles and sub-adults fed more intensively than adults during the warm-water season whereas adults fed more intensively during the cold-water season. Feeding activity was more intense at night, while cannibalism was more frequent during the warm season, when biological productivity was lower. Finally, diet diversity was higher in coastal waters, during the warm season. The abundance of cutlass¢sh o¡ southern Brazil may be explained by the fact that it is adapted to feed on a wide size-range of both pelagic and demersal prey.

Diet and potential feeding overlap between Trichiurus lepturus (Osteichthyes: Perciformes) and Pontoporia blainvillei (Mammalia: Cetacea) in Northern Rio de Janeiro, Brazil

“…However, the total biomass and density recorded in the stomach contents are lower in T. lepturus. The greater prey selectivity by T. lepturus is possibly associated with its voracity, as reported by MARTINS et al (2005) andCHIOU et al (2006). The values of biomass and density (number of individuals), in turn, may reflect differences in the digestion rate, the ability to fill the stomach and/or the nutritional needs of the predators.…”

“…There are no comparatives studies on the feeding habits of these species, but their diet has been studied separately (SHUOZENG 1995, DANILEWICZ et al 2002, RODRIGUEZ et al 2002, MARTINS et al 2005, CHIOU et al 2006, BITTAR et al 2008). …”

Hábito alimentar do peixe-espada adulto, Trichiurus lepturus, na costa norte do Rio de Janeiro, sudeste do Brasil

“…A espécie é predominantemente piscívora, inclusive pratica o canibalismo, mas cefalópodes e crustáceos peneídeos também fazem parte de sua dieta (Wojciechowski, 1972;Martins et al, 2005;Chiou et al, 2006). Apresenta heterogeneidade espacial e temporal influenciadas pela disponibilidade de alimento (Martins et al, 2005).…”

“…Apresenta heterogeneidade espacial e temporal influenciadas pela disponibilidade de alimento (Martins et al, 2005). No litoral do Rio Grande do Sul, sul do Brasil, fêmeas adultas e os juvenis permanecem na região da plataforma continental durante o inverno para se alimentarem e os machos adultos movimentam-se além dos limites da plataforma (Martins e Haimovici, 2000).…”

BIOLOGI REPRODUKSI DAN KEBIASAAN MAKAN IKAN LAYUR (Trichiurus lepturus, Linnaeus) DI SEKITAR PERAIRAN BINUANGEUN, BANTEN

“…Nilai Lc ikan layur di perairan Laut Arabia, Oman lebih besar dibandingkan di perairan Binuangeun yaitu 79 cm (Nahdi et al, 2009). Menurut Martins et al (2005) mengemukakan bahwa ikan layur dibagi kedalam 4 kategori berdasarkan ukurannya, yaitu juvenil (5 -30 cm ), remaja (30 -70 cm), dewasa (70 -100 cm), dan tua (> 100 cm). Dengan demikian nilai rata-rata ukuran pertama kali tertangkap (Lc) ikan layur yang didaratkan di Banten tergolong ikan yang masih remaja.…”