Based on the current demand on fish as food, marine fishes of the Sudan have been arbitrary divided into first, second and third grade fish. Examples of these are the red emperor (Plectroponus moculates) grade I, mullet fish (Plectroponus moculates) as grade II and unicorn fish (Naso unicornis) as grade III. This subjective grading, need to be evaluated on grounds of organo-leptic tests, gross chemical and body parts analysis and inclusion in experimentally designed feeding tests. The mean value and range of moisture, protein, fat and ash was determined and compared for the three species. The highest calorific value was (232.08) in C. crisbis and the lowest (144.2) in P. maculatus. The calorific value was expressed as a calories per percent of protein content plus calories per percent of fat content. The highest calorific value was (232.08) in C. crisbis and the lowest (144.2) in P. maculatus. The gross chemical composition was comparable between the three groups in ash content, but showed significant variability within moisture, within protein and in fat. The mean body weight in each cell in a column (feed1, 2, 3 and the control) was based on a triplicate and they were compared using the least significant difference (LSD) test. Very highly significant growth correlation (p
The mean total length and age at first maturity were established for Nemipterus japonicus, Leiognathus virgatus, Gerres oyena, Saurida undosquamis, Mulloidichthys flavolineatus and Terapon theraps from the Sudanese coast off Suakin. Five maturity stages were identified for each species. Females dominated in 53.3% of the cases, but not significantly (p > 0.05) in 40% of the cases, and the sex ratio was equal in two cases (6.7%). The lowest recorded fecundity was 150,500 eggs in M. flavolineatus and the highest was 1,950,342 eggs in G. oyena. April-June was the breeding season for N. japonicus, L. virgatus and G. oyena while May-July was the breeding season for S. undosquamis, M. flavolineatus and T. theraps. In all six species, the logarithmic relationships between fecundity and total length were very highly significant (p 0.001).
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