STUDIES ON THE EFFECT OF NATURAL FEEDS IN DIFFERENT COMBINATIONS ON GROWTH AND SURVIVAL OF CLAR1AS GARIEPINUS LARVAE | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 1, Volume 5, Issue 4, September 2001, Page 1-9 PDF (862.96 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2001.1705 | ||||
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| Author | ||||
| Gamal r Abd El-Nasser | ||||
| Central Lab for Aquaculture Research Abbassa, Sharkia, Egypt | ||||
| Abstract | ||||
| The suitability and potential of three live food were evaluated for feeding Clarias gariepinus fry. Three-day old African catfish larvae (5-7 mm total length, 1.2-3.0 mg body weight) were stocked at a density of 100 larvae per liter in nine glass aquaria 150 X 50 X 50 cm each, representing three treatments. Each treatment was represented in three replicates). Fish were reared for 35 days on three different feeding regimes using Artemia salina, Moina macrocopa and Brachionus plicatilis as live food. Larvae of all treatments were fed on Brachionus at a density of 10 per ml in the first four days. From day 5, the three treatments were fed on Brachionus at a density of 20 per ml until day 9, for treatments 1 and 3, and day 15 for treatment 2. In all rearing aquaria, Chlorella was added at a density of 1-3 X 105 cells per ml to serve as food for the rotifer and maintain good quality of water. Starting at day 10, Artemia nauplii were given to larvae of the first and third treatments initially at a density of 2 per ml in addition to Brachionus. The amount of Brachionus in the two treatments was gradually reduced to 10 per ml until it was completely removed on day 17. From this day to the end of the experimental trial, fish of the first treatment were fed on Artemia only, whose density was finally increased gradually to be 10 per ml. In treatment 3, Moina macrocopa were fed to the Clarias gariepinus larvae in combination with Artemia from day 18 to day 20 and later on, Moina was fed until day 35. In treatment 2, fish continued to feed on Brachionus and feeding of fish on Artemia was delayed until day 15. Artemia nauplii were fed in combination with Brachionus until day 20, after which only Artemia was given* Delaying feeding of Artemia nauplii until day 15 (in treatment 2) on resulted in slower larvae growth rates compared with fish fed Artemia starting on day 10. Partial replacement of Artemia nauplii by Moina macrocopa starting on day 17 showed a marked growth in larval growth over the delayed Anemia treatment- There was no significant difference in the survival percentage of al] treatments, | ||||
| Keywords | ||||
| Clarias gariepinus; Larvae; feeding; primary nursing | ||||
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