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Studies on the effects of different dietary protein sources on the growth and survival of Channa striatus from fry to fingerling stage
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-05) YESHDAS, B; RAVINDRA KUMAR REDDY, D(MAJOR); CHANDRASEKHARA RAO, A; MADHAVI, K
The present study “Studies on the effects of different dietary protein sources on the growth and survival of Channa striatus from fry to fingerling stage” was conducted in the Wet Laboratory of the Department of Aquaculture, College of Fishery Science, Sri Venkateswara Veterinary University, Muthukur, Nellore Dist. Two experiments were conducted- one for the effects of different dietary protein percentages and other for the effects of different dietary protein sources on the growth and survival of Channa striatus. Fish Meal is used as the protein source for the protein percentages (Crude Protein 40, 45 and 50%) in first experiment and Trash Fish, Goat Intestine and Chicken Waste are used as protein sources for the other experiment. The experiments were conducted for 60 days in Fiber tanks. Triplicates were maintained for each of the treatment. Feed was given twice a day. Weekly sampling was done for water quality parameters viz., pH, Temperature, Dissolved Oxygen (DO), Total Alkalinity and Total Hardness. The growth, survival, SGR and feed conversion ratio were estimated by sampling the fish once in a week. The temperature values recorded during 60 day period of the experiment were 26.1-29.4 in all the treatments. The pH values recorded during the 60 day of period of experiment were 7.41-7.69. The DO was found to be in the range of 5.9 ppm and 6.6 ppm. The range of Total Alkalinity varied between 160 mg/l to 166 mg/l in all the treatments. Total hardness of water ranged between 210 mg/l to 216 mg/l. Weight of Channa striatus fry (in grams) and weight increment data was observed weekly for different treatments at different protein percentages and protein sources. After 60 days, the highest average body weight of 6.61 g (Crude Protein 45%) and the lowest average body weight of 5.24 g (Crude Protein 40%) for different protein percentages; The highest and lowest average body weight of 4.87 g (Trash Fish) and 3.97 g (Chicken Waste) were observed. The Specific Growth Rate (SGR) for Channa striatus at different protein percentages and protein sources were calculated. The highest (1.86%) and lowest (1.70%) SGR recorded in Crude Protein 45% and Crude Protein 40% respectively for different protein percentages. The highest (1.64%) and lowest (1.49%) was observed in Trash Fish and Chicken Waste respectively for different protein sources. The Feed Conversion Ratio at different protein percentages and protein sources were calculated. The better (lowest) FCR of 1.52 and 2.18 was found in Crude Protein 45% and Trash Fish respectively. Survival rates at different protein percentages and protein sources were recorded. The highest (75.5%) and lowest (62.2%) survivals were observed in crude Protein 45% and Crude Protein 40% respectively for different protein percentages; the highest (68.9%) and lowest (60%) were observed in Trash fish and Chicken Waste respectively for different protein sources. Overall performance of Channa striatus fry at different dietary protein percentages and protein sources shows that highest Growth, Weight gain, SGR, Survival and lowest FCR is obtained in Crude Protein 45% at different dietary protein percentages; and highest Growth, Weight gain, SGR, Survival and lowest FCR is obtained Trash Fish at different dietary protein sources.
Open Access
Studies on Physico-chemical characteristics of Nellore and Kanigiri reservoirs of Andhra Pradesh
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-03) VENKATESH, D; MADHAVI, K (MAJOR); PRABHANJAN KUMAR REDDY, C; DHANAPAL, K
The present investigation was carried out in Kanigiri and Nellore reservoirs of SPSR Nellore district, Andhra Pradesh, for a period of 8 months from December, 2015 to July, 2016. Surface water samples were collected from the chosen sampling stations at fortnightly intervals and analyzed as per APHA standard methods to provide base line information on the physico-chemical characteristics of these reservoirs. The results obtained (for which guidelines have already been issued by the standard recommending bodies i.e., WHO, BIS) were found to be within the prescribed limits, except BOD as per WHO (2004) and total hardness, when compared with the standards (WHO, 1984; WHO, 2004; BIS, 1991; BIS 2012). Total hardness values were much higher than the permissible limit as prescribed by WHO (1984) but well within the permissible limits as prescribed by BIS (1991) standards. The observed values were tested from fisheries point of view also with the standards proposed by renowned scientists of the field and found to be well within the desired limits. Though the values obtained were within the prescribed standard values, it was found that turbidity, TSS, TDS, TS, pH, BOD, NH3, total alkalinity and total hardness values were found to be slightly higher in the water samples analyzed from Nellore reservoir, while transparency, DO, CO2 levels seemed to be little higher in water samples collected from Kanigiri reservoir. Mean chloride content and salinity values showed negligible difference between the waters of both the reservoirs. With respect to the parameters analyzed in the present study, water quality of Kanigiri reservoir is comparatively better than the Nellore reservoir. Correlation among various parameters showed significant positive and negative trends. Water from both the reservoirs can be considered as ‘alkaliphilous’ based on pH values observed, ‘nutrient rich’ based on the total alkalinity values estimated, ‘hard’ with respect to observed total hardness values. Though both the reservoirs exhibited moderate domestic pollution based on the analyzed chloride content of water, these concentrations are found to be within in the limits as per standards recommended for drinking water supply. Hence, it can be said that, water from both the reservoirs is fit for irrigation, agriculture, pisciculture, industrial and domestic purposes. 1
Open Access
STUDIES ON GROWTH AND SURVIVAL IN NURSERY REARING PHASE OF GREY MULLET (Mugil cephalus) FOR MARICULTURE
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-11) SANTOSH KUMAR, TADANGI; Ravindra Kumar Reddy, D (MAJOR); Chandrashekara Rao, A; MADHAVAN, N
The present studies were conducted at the closed bay near Suryalanka, Bapatla, Guntur district on “Studies on growth and survival in nursery rearing phase of Grey mullet (Mugil cephalus) for mariculture”. Total two (2) studies were conducted. The first study was on the effect of stocking density on growth and survival of grey mullet, (Mugil cephalus) in floating net cages in closed bay, Bapatla. Triplicate groups of mullets with an average initial weight of 0.95 g were randomly stocked in floating net cages (1m×1m×2m) at 20, 40, 60 and 80 fish/m3 designed as D20, D40, D60 and D80 respectively. Mullets in the cages were fed with 25% CP formulated diet at 10% of body weight twice daily. Sampling was done weekly. At the end of the experiment, growth in terms of body weight of fish was high in D20 than those in D40, D60 or D80, and in terms of weight gain, and specific growth rate of fish was high in D40 than those in D20, D60 and D80. There was no significant difference in the survival rates of mullets at different stocking densities. At the end of the experiment survival rates was almost similar in D20, than those in D40, D60 and D80. Total Feed Conversion Ratio was lower in D20 and D40, followed by D60 and D80. The cages stocked with 20 fish/m3 have highest growth performance and 80 fish/m3 showed highest biomass performance. Water quality parameters were at optimum level during study period. Results suggest that 20 fish/m3 could be recommended for producing better quality mullet fingerlings and 80 fish/m3 for highest number of seed production. Another experiment was conducted to study the optimum crude protein for grey mullet, Mugil cephalus seed in floating net cages. Mullet fry were obtained through natural seed collection. Rectangular floating net cages made of bamboo poles were provided inside with 1×1×2m hapas. Predatory net and bird net were provided. PVC drums filled with air were fixed to the net cage for floating. Mullets with mean body weight of 0.95 g were stocked at the rate of 40 fish/m3 in each hapa in the rectangular cages. Triplicates were maintained for each treatment. Fish fry were fed with 5 artificial dry diets containing 12.5% (Control – C (T1)), 15% (T2), 25% (T3), 35% (T4) and 45% (T5) crude protein. The diets were fed at the rate of 10% of the biomass for a period of 63 days (9 weeks). Water quality parameters like D.O, pH, salinity, NH3, NO-2, NO-3 and temperature were estimated at weekly intervals and were within the optimum range for culture of mullet. At the end of 63 days growth experiment, fishes fed on 25% (T3) crude protein feed exhibited highest growth and survival performance at 1% and 5% level of significance. The present study showed that Mullets seed reared in floating net cages in the closed bay performed best at 25% crude protein.
Open Access
SCREENING FOR INCIDENCE OF MICROSPORIDIAN PARASITE Enterocytozoon hepatopenaei (EHP) IN Litopenaeus vannamei FROM AQUACULTURE PONDS IN SPSR NELLORE DISTRICT OF ANDHRA PRADESH
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-02) RAVEENDRA, MATLAPUDI; HARI BABU, P (MAJOR); Neeraja, T; MADHAVAN, N
Hepatopancreatic Microsporidiosis (HPM) caused by Enterocytozoon hepatopenaei (EHP), a microsporidian parasite to be associated with slow (retarded or stunted) growth and white feces syndrome (WFS) in cultured shrimp in many of the shrimp growing countries in Asia, also in India. In the present study, shrimp samples from various shrimp ponds from different Mandals of SPSR Nellore district, Andhra Pradesh, India, were collected over a period of five months (February 2016 to June 2016). Important diagnosis observed were histopathological studies, molecular technique (PCR) and also the effect of this parasite on pond profitability. Histologically, the infected animals showed severe degeneration of hepaotopancreatic tubule, basophilic inclusions resembling the developmental stages of EHP were found in the epithelial cells and large number of spore aggregations was observed in the tubular lumen. Enlargement of haemal sinuses was also observed in some cases. The problems associated with slow growing shrimp populations were found to be basically two groups, these are; Group A: slow growing animals associated with white gut and white feces and Group B: slow growing animals without any clinical signs. Samples from these two groups (25 case studies each) were examined for the presence or absence of EHP. As per group A population, 12 samples were positive by histopathologically and another three more samples are further confirmed by PCR, the remaining 10 samples did not give any recognizable indication. In the group B animals, showed only the presence of EHP in 11 samples histopathologically and further confirmation with PCR tested positive in 5 more samples, the remaining 9 samples were not showing any apparent signs of infection. From this study, out of 50 pond case studies, 31 cases were showing EHP symptoms with 62 % prevalence. To evaluate the economical importance of this parasite on pond profitability, five farm pond production effected by both EHP and white feces syndrome were compared with 5 normally performed shrimp population with biosecured environment. EHP-infected ponds have poor performance in average daily growth (ADG), days of culture (DOC), average body weight (ABW), feed conversion ratio (FCR) and shrimp biomass compared to normal healthy ponds. The portal route of entry of pathogen into shrimp was evaluated by performing oral feed bioassay, it was revealed that EHP can be transmitted through per os feeding of EHP infected hepatopancreas tissue to healthy shrimp.
Open Access
Studies on catch composition and Biology of Oreochromis niloticus (Linnaeus, 1758) from Nellore and Kanigiri Reservoirs of Andhra Pradesh
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-02) PRAGNA, G; Ramalingaiah, D (MAJOR); Suguna, T; Ravindra Kumar Reddy, D
The present investigation was carried out on Catch composition, Morphometric & Meristics, Length-Weight relationships, Food and feeding, Reproductive biology, Age and growth, Mortality. Length-frequency data of Nile tilapia was collected from fish landing centres of Nellore and Kanigiri reservoirs of Andhra Pradesh from August, 2015 to July, 2016. The catch composition of two reservoirs was investigated and higher annual yield was reported from Nellore reservoir (639.03 kg/ha/yr) than Kanigiri reservoir (334.70 kg/ha/yr). In both the reservoirs, catches of O. niloticus was dominant followed by O. mossambicus and Rohu species (L.rohita, L. calbasu, L. fimbriatus). Basically Nile tilapia is herbivorous followed by omnivorous. Length at first maturity was observed at 189.5 mm and 164.5 mm from Nellore and Kanigiri reservoirs. The absolute fecundity of Nellore and Kanigiri ranged from 1854 to 2371 eggs for 180 to 335 g fish and 368 to 568 eggs for 70 to 190 g fish at each reservoirs respectively. Riped ovaries observed highest during September followed by December from Nellore Reservoir where as March followed by November in case of Kanigiri reservoir. The Von Bertalanffy’s growth parameters for O. niloticus from Nellore reservoir worked out as L = 43.48 cm, K=0.71 per year and to = 0.11. Based on these values the growth at the end of I-IV years of its life worked out to be 23.71, 33.76, 38.7 and 41.13 cm respectively. The Von Bertanlanffy’s growth parameters for O. niloticus in Kanigiri reservoir were L = 29.12 cm, K= 0.69 per year and to = 0.07 and based on these values the growth at the end of I - IV years were 15.2, 22.13, 25.61 and 27.36 cm respectively. The mortality co-efficient (Z, M and F) for Nellore reservoir were estimated as 5.32, 1.70 and 3.62 and for Kanigiri reservoir 5.09, 1.50, 3.59 respectively.
Open Access
Studies on Water and Sediment characteristics of Krishnapatnam coastal region, Southeast coast of India
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-08) SRI DATTATREYA, P; MADHAVI, K (MAJOR); PRABHANJAN KUMAR REDDY, C; NEERAJA, T
The present investigation on water and sediment quality of Krishnapatnam coastal region (Southeast coast of India) with respect to mangrove and beach areas was carried out for a period of ten (10) months from June, 2016 to March, 2017. Surface water and sediment samples were collected from the chosen sampling stations at fortnightly intervals and analyzed as per APHA (2005) standard methods to provide base line information on the physico-chemical characteristics of these coastal biotopes. During the study period, variations observed in different water quality parameters of mangrove and beach stations respectively are as follows: pH (7.4-8.1 and 7.6-8.6), salinity in ppt (21-33 and 30-35), EC in mS/cm (32.81-51.56 and 46.88 -54.69), DO in mg/L (2.7-5.0 and 5.4-8.9), BOD in mg/L (1.14-3.68 and 0.98-2.3), total alkalinity in mg/L (112-168 and 116-184), total hardness in mg/L (3349-5463 and 4389-6204), total solids in g/L (24.5-33.7 and 26.1-34.0), TSS in g/L (0.7-3 and 0.9-3.9), total ammonia in μg/L (3.6-19.8 and 1.2-10.8), nitrite in μg/L (0.36-3.52 and 0.14-3.6), nitrate in μg/L (1.84-4.85 and 1.2-4.34), phosphate in μg/L (1.021-3.65 and 0.116-0.824). With respect to sediment quality, during the study period the ranges observed were pH (6.9-7.9 and 7.2-8.3), EC in mS/cm (3.27-3.75 and 3.27-3.68), organic carbon in % (0.33-2.93 and 0.43-2.41), available nitrogen in Kg/ha (187-796 and 245-721), available phosphorus in Kg/ha (10-93 and 5-59), available potassium in Kg/ha (410-947 and 231-889), zinc in mg/Kg (2-34 and 1-93), iron in mg/Kg (2.68-35.8 and 4.7-13.5), Boron in mg/Kg (1-4.8 and 1-4.6) and sulphur in mg/Kg (70-147 and 21-146) for the samples collected from mangrove and beach areas respectively.
Open Access
EFFECT OF BIOFLOC BASED CULTURE SYSTEMS ON MICROBIAL COMPOSITION, GROWTH AND IMMUNE RESPONSE IN PACIFIC WHITE SHRIMP, LITOPENAEUS VANNAMEI
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-07) LAVANYA, CH.; Neeraja, T (MAJOR); Haribabu, P; Ravindra Kumar Reddy, D
A 49 day indoor trail was conducted with three treatments and one control to evaluate only biofloc (T1), biofloc+substrate (T2) and only substrate (T3) based rearing systems on the microbial composition of rearing water, growth performance and immune response of pacific white shrimp Litopenaeus vannamei. Wheat flour was used as carbon source to maintain C/N ratio at 15:1 in treatments T1 and T2. Each experimental group consisted of four replicates in rectangular HDPE tanks of 70 lit capacity filled with 10 ppt salinity treated sea water were stocked with 10 numbers/tank of uniform sized L. vannamei juveniles (4.56 ±0.13 g). The net weight gain, SGR, FCR, FER and survival rate were significantly higher (P < 0.05) in the treatment groups than control. Among the treatments, higher net weight gain (10.38 ± 0.14 g), SGR (2.42 ± 0.02), FER (8.85 ± 0.09), survival (77.50 ± 0.95 %) and lowest FCR (1.27 ± 0.12) were recorded in T2. The water quality parameters viz., DO, water temperature, pH, salinity, total ammonia-N (TAN), nitrite and nitrate were in manageable range for L. vannamei. The addition of wheat flour in the treatments T1, substrate in T3 and both wheat flour and substrate in T2 has significantly reduced TAN, nitrite and nitrate in treatment tanks than the control. At the end of the experiment, water samples analyzed for microbial population has shown significantly higher (P < 0.05) total heterotrophic bacteria (THB), Bacillus, Lactobacillus and Vibrio counts in all the treatments than control. Among the treatments, significantly higher microbial count was recorded in T2 followed by T1 and T3. The haemolymph and serum samples collected at the end of the experiment to study the immune status of shrimp has shown significantly higher (P < 0.05) total haemocyte count (THC), total hyaline cells, total granuloc ytes, serum protein, phenoloxidase (PO) activity, serum lysozyme activity in treatment groups when compared to the control. Among the treatments, T2 with biofloc and substrate combination has recorded with significantly higher THC (47.24 ± 4.49 x 106 cells ml- 1), hyaline cells (18.21 ± 2.22 x 106 cells ml-1), total granulocytes (29.04 ± 2.89 x 106 cells ml-1), serum protein (82.67 ± 0.01 mg/ml), serum PO activity (0.73 ± 0.03 OD at 490 nm) and serum lysozyme activity (56.32 ± 0.03 %). The study revealed that biofloc, substrate and biofloc+substrate combination systems have performed significantly better in terms of water quality, beneficial bacterial loads in water, growth performance and immune response in L. vannamei juveniles. Further, it could be concluded that the integration of substrates in BFT has resulted in higher production of L. vannamei.
Open Access
EFFECT OF BIOFLOC TECHNOLOGY ON GROWTH AND IMMUNE RESPONSE OF NILE TILAPIA, OREOCHROMIS NILOTICUS
(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2017-02) ANUSHA, S; NEERAJA, T (MAJOR); HARIBABU, P; CHANDRASEKHARA RAO, A
The present study: “Effect of biofloc technology on growth and immune response of Nile tilapia, O. niloticus” was conducted in the Wet Laboratory of the Department of Aquaculture, College of Fishery Science, Sri Venkateswara Veterinary University, Muthukur. A 60 day indoor trail was carried out to evaluate biofloc and biofloc cum substrate based rearing systems on the growth performance, non-specific immune response of Nile tilapia, Oreochromis niloticus fingerlings. The C/N ratio of 15 was maintained in three biofloc treatments viz., T1 (only biofloc), T2 (biofloc + bamboo) and T3 (biofloc + nylon mat substrates) using wheat flour as carbon source along with control (without biofloc and substrate). Each “Effect of biofloc technology on growth and immune response of Nile tilapia, O. niloticus” Master of Fishery Science in Aquatic Animal Health Management Department of Aquatic Animal Health Management group consisted of four replicate aquarium tanks of 70 lit capacity with each tank stocked with 15 fingerlings (4.40 g±0.05) of O. niloticus for growth performance. The water quality parameters viz., DO, water temperature, pH, TAN, NO2-N and NO3-N were in manageable range for tilapia. At the end of the study period blood and serum samples were collected for the evaluation of hematological, non-specific immune and stress parameters. The results indicated that tilapia reared in treatment groups showed significantly (p<0.05) higher performance, than the control. Among the treatments, T2 has shown higher serum protein, anti-protease activity, lysozyme activity and lower serum glucose and cortisol when compared to T3 and T1. Growth, food conversion ratio (FCR), feed efficiency ratio (FER) and specific growth rate (SGR) of fishes in biofloc (T1) and biofloc cum substrate (T2 and T3) treatments were significantly (p<0.05) higher than the control. The treatment T2 showed significantly higher RBC, WBC, platelet count, Hb, HCT, MCV, MCH and MCHC values than the treatments T3, T1 and control. The study revealed that, tilapia reared in biofloc based culture system in combination with substrates for periphyton growth can enhance growth, non-specific immune response and lower stress under minimal water exchange and restricted feeding.

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