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Journal Of Tropical Biosciences

Year: 2015|   Volume No: 10|   ISSN: 0795-3089|   Page No: 82


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Title:  

NUTRITIONAL COMPOSITION OF CATEGORISED ARTIFICIALLY SPAWNED HETEROBRANCHUS LONGIFILIS VALENCIENNES, 1840 F1

SULEIMAN, B., AUTA, J. ONIYE, S.J. AND ABDULLAHI, S.A.

DEPARTMENT OF BIOLOGICAL SCIENCES, AHMADU BELLO UNIVERSITY, ZARIA

ABSTRACT

The nutrient composition of three growth classes of eight-week old juveniles, twenty-eight week old adult; and male and female table-size Heterobranchus longifilis was determined to ascertain the effect of these variables on nutritional status of fish. The moisture, protein, fat, ash, fiber, nitrogen free extract and caloric values of the samples were analysed as described by the Official Methods of Analysis of the Association of Official Analytical Chemists. Whole carcass analysis amongst the juveniles revealed combined mean percentage values of 73.54 ± 1.30, 9.76 ± 0.61, 13.8 ± 1.17 for moisture, protein and fat, respectively. Proximate analysis of muscle samples from fishes representing the growth classes of 22-week H. longifilis F1 revealed combined mean values of 18.89 ± 1.01%, 2.34 ± 0.42% and 98.40 ± 6.48 kilocalories for protein, fat and energy respectively. Protein content in fish was unaffected by growth rate and sex. Differential growth rate was influenced by feed accessibility and utilization as evidenced by low fat in the “runs” compared to other growth classes.

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SUMMARY:

Protein content in fish is unaffected by growth rate and sex. Differential growth rate between and F1 generation is influenced by feed accessibility and utilization as evidenced by low fat in the “runs” compared to other growth classes. The “shooters” have more available energy for metabolic activities which enhances faster growth as observed in their higher caloric values. From the study it could be suggested that duosex systems could be maintained for the production of H. longifilis F1, as growth rate is not affected by sex. The preference of “shooters” or weightier fish amongst fish of the same age for dietary purposes with a view to harnessing the benefits of fish oil.

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