TL;DR: A detailed quantitative investigation of the feeding habits of seven important Natal inshore reef fish is described and the ratio of carnivores, omnivores and herbivores is 4:1:1.
Abstract: A detailed quantitative investigation of the feeding habits of seven important Natal inshore reef fish (Epinephelus andersoni Boulenger, 1903, Coracinus mulfifasciafus (Pellegrin, 1914), Pomadasys olivaceum Day, 1875, Diplodus sargus Linnaeus, 1758, Sarpa salpa (Linnaeus, 1766), Acanthurus triosfegus Linnaeus, 1758 and Neoscorpls lithophilus (Gilchrist & Thompson, 1908)) is described. Qualitative information on the feeding of 23 other species is also given, and when all species are considered the ratio of carnivores, omnivores and herbivores is 4:1:1.
TL;DR: Methods for the determination of age from otoliths of the kob and the spotted grunter are described and growth curves provide estimates of length for age, while use of length/weight relationships enable estimates of weight for age to be made.
Abstract: Summary Methods are described for the determination of age from otoliths of the kob (Argyrosomus hololepidotus) and the spotted grunter (Pomadasys commersonni.) Growth curves provide estimates of length for age, while use of length/weight relationships enable estimates of weight for age to be made. These are discussed in relation to the age composition of estuarine populations, age at sexual maturity and years of greatest weight increment.
TL;DR: The distributions of eight teleosts and four Chondrichthyes trawled off the Cape south coast are given and incidental observations on the biology of these species are also given.
Abstract: The distributions of eight teleosts and four Chondrichthyes trawled off the Cape south coast are given. The teleosts include Pagellus natalensis, Pomadasys olivaceum, Llthognathus mormyrus, Trachums spp., Galeichthys sp., Atractoscion aequidens, Cheimerius nufar and Sphyraena africana. The Chondrichthyes are Squalidae, Myliobatis aquila, Rhinobatos annulatus, Dasyatis pastinacus and Callorhinchus capensis. Incidental observations on the biology of these species are also given. Extensive inshore marine nursery areas for the teleost species were identified. The importance of this with respect to inshore trawling is noted.
TL;DR: The diet of "Red Snapper" Lutjanus colorado has ontogenic differences: in juvenils, at any time of the year, the most frequent and abundant components were fishes, and in adults they were panaeid shrimps.
Abstract: A total of 308 "Red Snapper" Lutjanus colorado were collected monthly in the Gulf of Nicoya, Costa Rica, from January 1993 to January 1994 to determine feeding habits. The fishes (16-56 cm in total length) were polychaete worms and plant debries were found in the stomach contents. The total biomass was984.2 g; 40% of the stomachs were empty. The diet has ontogenic differences: in juvenils, at any timeof the year, the most frequent and abundant components were fishes (i.e. Anchoa sp., Tomicodon sp. and Pomadasys sp.), and in adults they were panaeid shrimps (i.e. Panaeus californiensis, P. occidentalis and P. stylirostris ). The maiin food of the bigger fishes (≥ 50 cm TL) were stomapods ( Squilla sp.). The relative importance of different components of the diet was assessed with two indexes that combine, in different ways, porcentage frecuency of occurrence, percentage number and percentahe weigth of prey categories. The relative importance and feeding coefficient of the main dietary items did not vary during the year.