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Subject: Fisheries × Author: GOUTHAM CHOWDARY, M × Start date: 2005 ×
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    ThesisItemOpen Access
    PERFORMANCE EVALUATION OF CATLA CATLA FRY RAISED ON DIFFERENT FEEDS AND EXPOSURE TO PATHOGENS IN FARMERS PONDS DURING WINTER SEASON
    (SRI VENKATESWARA VETERINARY UNIVERSITY , TIRUPATI - 517 502, Andhra Pradesh, 2015-01) GOUTHAM CHOWDARY, M; Hari Babu, P (Major); Ravindra Kumar Reddy, D; Sudhakar, O
    ABSTRACT: The carp farming system of Nellore region was developed totally based on ‘Kolleru carp culture’. Nellore region depends on Kolleru area for its fish seed requirement. So in Nellore region also majority of farmers adopted a three tier culture system comprising nursery, rearing and grow-out production units. The principle aim of this nursery or rearing units is not to obtain large size or healthy seed, but rather to obtain the maximum possible numbers only. Mash feed was the most popular and widely used feed type. The poor quality of the mash feed ingredients especially the rice bran (RB), de-oiled rice bran (DORB), de-oiled groundnut cake (DOGNC) cake are issues of major concern to the farmers. Earlier published reports state that the prevalence of the diseases was more in winter season and that occurs in the same season every year. In addition a preliminary survey carried out before start of this experiment from 14 farmers revealed that poor survival of catla seed with large heads and gill infections having white nodules particularly during the winter season was noticed as an issue of mojor concern. Under the circumstances, the present experiment was designed and carried out in the Department of Aquaculture, College of Fishery Science, SVVU, Muthukur, Andhra pradesh, India for a period of 60 days to study the effect of Myxobolus sps. infection and its effect on catla fry comparatively with conventional mash and commercial pellet feed and discussed the results thus obtained. Catla fry was sourced from nearby fish farmer’s pond and acclimitized for 10 days before starting the experiment. Fibre Reinforced Plastic (FRP) tanks ( 12 no.) each with 500 liters water capacity was stocked with 10 numbers of fish in each tank. Experimental feed was given ( four types ) twice per day at ad libitum. The unconsumed feed and faecal matter was siphoned out daily in the morning. At the end of the experiment, the performance of formulated seed was significantly higher ( 76.67% and 53.34% ) than with conventional feeds ( 20% and 0% ). The duration of the experiment was in agreement with the published work i.e, winter season. Since the prevalence of Myxobolus infection was 100% in the experimental animals and the present study attempted in evaluating the nutritional efficiency. The formulated feed being the best with more than 50% survival contrastingly the mash feed (DORB) resulted in zero survival it may be appropriate to educate the fish farmers to use formulated feeds so that the enhanced catla fry survival from nursery ponds can help farmers till further improvements are attempted in making ‘fish seed healthy’.