Campagnes Chalci, Chalci 83-01 (du 11 au 19-01-83) et Chalci 83-02 (du 10 au 18-03-83): resultats des chalutages

This publication gives the results of bottom trawlings made during the cruises Chalci 83.01 and Chalci 83.02 by the oceanographic research vessel "André Nizery", on the ivorian continental shelf. The publication content is: - an introduction explaining the form of results; the trawl recording cards with the characteristics of trawl and the detail of catches by species; the length frequency distributions of the measured samples.

Campagnes Nizery: Togo 1 (26 et 27/01/83) et Togo 2 (07 au 10/06/83). Resultats des chalutages

This publication gives the results of the bottom trawlings made during the cruises Togo 1 and Togo 2 by the oceanographic research vessel "Andre Nizery" on the continental shelf of Togo during the estimation program of halieutic resources. The report includes: 1 - The report of the cruises Togo 1 and Togo 2; 2 - Some information on the presentation of the results; 3 - The trawl recording cards for the 2 cruises; 4 - The length frequency distributions of the measured samples.

Development and growth of hatchery-reared larval Florida pompano (Trachinotus carolinus)

Although the Florida pompano (Trachinotus carolinus) is a prime candidate for aquaculture, the problematic production of juveniles remains a major impediment to commercial culture of this species. In order to improve the understanding of larval development and to refine hatchery production techniques, this study was conducted to characterize development and growth of Florida pompano from hatching through metamorphosis by using digital photography and image analysis. Newly hatched larvae were transparent and had a large, elongate yolk sac and single oil globule. The lower and upper jaws as well as the digestive tract were not fully developed at hatching. Rotifers were observed in the stomach of larvae at three days after hatching (DAH), and Artemia spp. were observed in the stomach of larvae at 14 DAH. Growth rates calculated from total length measurements were 0.22 ±0.04, 0.23 ±0.12, and 0.35 ±0.09 mm/d for each of the larval rearing trials. The mouth gape of larvae was 0.266 ±0.075 mm at first feeding and increased with a growth rate of 0.13 ± 0.04 mm/d. Predicted values for optimal prey sizes ranged from 80 to 130 μm at 3 DAH, 160 to 267 μm at 5 DAH, and 454 to 757 μm at 10 DAH. Based on the findings of this study, a refined feeding regime was developed to provide stage- and size-specific guidelines for feeding Florida pompano larvae reared under hatchery con