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United Arab Emirates University (2005)

Effects of Food Sources and Culture Conditions on Feeding Behaviour and Growth Rates of Nile Tilapia Fry (Oreochromis niloticus)

Latifa Juma Rashid Al-Shamsi

Titre : Effects of Food Sources and Culture Conditions on Feeding Behaviour and Growth Rates of Nile Tilapia Fry (Oreochromis niloticus)

Auteur : Latifa Juma Rashid Al-Shamsi

Université de soutenance : United Arab Emirates University

Grade : Master of Science (MS) 2005

Résumé partiel
The importance of fish aquaculture in general as an alternative source of animal protein, is raised during this century after the significant reduction of natural marine resources. Such reduction has increased the interest of many countries as well as international agencies in worldwide food security, especially for developing countries. The success of any aquaculture is chiefly judged by its economic development, which always depends on the management of producing acceptable marketing size and weight of fish in short time. In the last few decades, many aquacultures failed in balancing between the financial input and the resultant income. That is due to many reasons ; one of them is the high mortality in fish fry which resulted from either the difficulty of obtaining a suitable diet (live food) or from the quality of the living conditions of the cultured fry. In the Middle East countries especially, and in Asia as general, certain fish species are becoming the most cultured ones because of their high consumption and because of their acceptable commercial price by local populations. However, in the last few years, such prices have increased, due to many reasons. These include, the increase of artificial diets items and the high mortalities of fish fry due to the lack of the food necessary to the fry immediately after its hatching. A viable example is Tilapia nilotica species (Oreochromis niloticus). In the present study two types of experiments were designed to investigate the effect of different food sources on the growth rates of Nile tilapia fry (Oreochromis niloticus), and to evaluate the effect of some culture conditions on the feeding behaviour of the fry. In the first experiment, the effects of three types of food (ChIorella vulgaris, Artemia fransciscana, and Artificial feed) and various combinations of the three types (ChIorella + Artemia ; Chlorella + Artificial feed ; Artemia + Artificial feed ; and Chlorella + Artemia + Artificial feed) on the growth, feed utilization and survival of Nile tilapia fry has been investigated, with average initial weight of 12 mg fry-1. Tilapia fry were cultured in a closed system and fed with seven feed combinations. Triplicate groups of fry with 24 fry per 6 L tank were used for each treatment. The diet was offered 3 times a day, for 35 days. The results indicated that the maximum body weight and survival was achieved by fry fed on Artemia, followed by those fed on the combination of the three food types, then by Artemia + Artificial. On the other hand, the minimum growth and survival were observed from the fry fed only with Chlorella suspension. The fry fed only with Artificial feed showed moderate growth and good survival

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