The growth performance and survival of Clarias gariepinus fry raised in homestead concrete tanks
Fertilizer application in earthen ponds has been used as a low-cost method of sustainable aquaculture production. This study was carried out to investigate the growth response of African Catfish fry Clarias gariepinus (Burchell, 1882) in three different culture media in Homestead concrete tanks. The water in the control (T1) was not treated while T2 and T3 were treated with poultry droppings and soy bean milk filtrate respectively. Nine hundred (900) catfish fry weighing averagely 0.67 ? 0.69g were randomly allocated per treatment. In each tank (2m x 3m x 1.5m) were suspended (3) net cages each (1m x 1m x 1m). Each net cage had 100 fry. The fish in tank 1 (control treatment) were fed fish meal from the start at 5% of their body weight four times daily while the other treatments were not fed at all for the first 7 days. Feeding with fishmeal commenced for treatments T2 and T3 on the next 8 ? 14 day. The weights of the feed were adjusted after weekly weighing Analyses of the culture media for phytoplankton composition and water quality parameters were done for all treatments at the end of the experiment. Tables 3 and 4. The culture media with poultry manure (T2) and soyabean filtrate (T3) were found to influence the quality and quantity of the plankton which in turn determined the growth and survival. Tables 1 and 2. However, the best weight increase was recorded in T1 (2.33g) followed by T3 (1.89g) and then T2 (1.81g) had the lowest weight gain. The survival rates in all the treatments were high but was highest in T3 (98%) followed by T2 (97%) and T1 (95%). Dissolved oxygen, pH and temperature of culture media were variously affected by the treatments. The presence of zooplanktons (Rotifer and Daphnia species) invariably supported the highest survival (98%) of the fry in treatment T3. Treatment T3 (11.56 ~c 1.14) x 103) generated higher concentrations of most of identified zooplanktons than treatments T1 (5.39 ~c 0.73) x 103) and T2 (12.78 ~c 0.98) x 103). These zooplanktons were absent in treatments T1 and T2. The result indicated that fertilizing the culture medium using soybean milk filtrate or poultry droppings improved the growth and of C. gariepinus.
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
FISON
2010
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| Subjects: | Aquaculture, Clarias gariepinus, Nigeria, Ibadan, freshwater environment, Fish culture, Growth rate, Growth, Survival, Food organisms, |
| Online Access: | http://hdl.handle.net/1834/38144 |
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