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20152
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Subject: Fisheries × End date: 2016 × Start date: 2015 ×
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    ThesisItemOpen Access
    IMPACT ON GROWTH AND SURVIVAL OF LITOPENAEUS VANNAMEI FED ON BIOFLOC GROWN WITH DIFFERENT CARBON SOURCES
    (SRI VENKATESWARA VETERINARY UNIVERSITY , TIRUPATI - 517 502, Andhra Pradesh, 2015-08) PAMANNA, DASARI.; CHANDRASEKHARA RAO, A (Major); RAVINDRA KUMAR REDDY, D; MADHAVAN, N
    ABSTRACT: The present study : “Impact of growth and survival of Litopenaeus vannamei fed on biofloc grown with different carbon sources’’ was conducted in the Wet Laboratory of the Department of Aquaculture, College of Fishery Science, Sri Venkateswara Veterinary University, Muthukur Impact of L. vannamei rearing with biofloc by using different carbohydrate materials ( wheat flour, tapioca flour and molasses) as a carbon source to boost the production by improving the conversion of nutrients into harvestable products while maintaining good water quality. The carbohydrate sources for this study were selected based on easy availability and economic viability. In the present study it has been evaluated to identify the efficient carbon source to develop the quality biofloc which play significant role in growth and survival of L. vannamei. Experiments were conducted with three biofloc treatments and one control in triplicate in 1000 ltr capacity indoor tanks and water level filled up to 600 ltr. Different carbohydrate sources addition for biofloc rearing played significant impact on water quality of shrimp rearing tanks. Water quality parameters were in the acceptable level for L. vannamei cultured in all the biofloc treated tanks. Enhanced shrimp growth was noticed in biofloc treatment tanks. There was a significant difference in the final average body weight of (15.92±0.07g) in the wheat flour treatment than those treatments and control group of shrimp. The FCR differs significantly between biofloc treatment group and control (P<0.05). FCR lowest (0.5±0.07) was recorded in wheat flour as carbohydrate source biofloc treatment. Highest SGR (4.59) was observed in the wheat flour treatment than those treatments and control. Wheat flour utilization as carbohydrate source to biofloc development for rearing of L. vannamei was proved to be the best option among all treatments. The addition of carbohydrate for biofloc development affected the survival of L. vannamei. The highest survival of (73.36%) was recorded for wheat flour used as carbohydrate source in biofloc treatments. All the carbohydrate sources ( wheat flour, tapioca flour and molasses) utilized for biofloc treatments indicated highest growth and survival than control treatment.
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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’.