FT Vol.59(3)
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- ItemFish Attractants used in Deep Pool at Hogenakkal Falls of River Cauvery, India(ICAR-Central Institute of Fisheries Technology, Cochin, India, 2022-08-02)
- ItemA Comprehensive Account of Fishing Crafts and Gears of River Tapti, India(ICAR-Central Institute of Fisheries Technology, Cochin, India, 2022-08-02)
- ItemEconomics of Cage Culture of Fish in Karnataka(ICAR-Central Institute of Fisheries Technology, Cochin, India, 2022-08-02)Cage culture has emerged as a suitable alternative to fishermen to sustain their livelihood. Cage culture is extensively practiced in Karnataka. The present study aimed at assessment of economics of cage culture in Udupi district of Karnataka. Cage culturing of sea bass and red snapper in two small cages (2S), one small and one large cage (S+L) and two small and one large cage (2S+L) was observed in the study area. The capital investment was highest in case of 2S+L at Rs. 1,34,380. The total cost incurred on production of sea bass and red snapper came to Rs. 4,38,885 and Rs. 8,11,939.20 in case of S+L and 2S+L, respectively. Fishermen following 2S+L was found to be economically successful in terms of net returns (Rs. 233.37/kg and Rs. 122.94/ kg) compared to S+L (Rs. 226.45/kg and Rs. 78.14/ kg) in cage culture of sea bass and red snapper due to the operation of scale economies. The cage system 2S+L was found economically viable but was fraught with constraints in operational and financial management.
- ItemAssessing the Safety of Fish Retail Shops and Associated Environment for Antimicrobial Resistant Non–Typhoidal Salmonella(ICAR-Central Institute of Fisheries Technology, Cochin, India, 2022-08-02)Non-typhoidal salmonellosis stands among the major foodborne illnesses. Outbreaks from contaminated fishes have been witnessed worldwide. A cross-sectional study was performed. A total of 368 samples (fish and associated environmental samples) were collected to assess the presence of non– typhoidal Salmonella in fishes and associated environment of 22 retail fish meat shops. The overall occurrence of the organisms was found to be 4.35% (16/368) with highest in fish rinsing water (18.18%, 4/22) followed by knife swabs (11.11%, 3/27), chopping board swabs (8.33%, 2/24), meat swabs (6.52%, 3/46), floor swabs (4.54%, 1/22), gill and intestine swabs (4.34%, 1/23), fish holding water (2.43%, 1/41). S.Typhimurium (87.5%, 14/16) was found as the prevalent serovar. Major virulence genes harboured were sipA gene (87.5%) followed by stn (75%), sopB (68.75%), sopE1 (56.25%) mgtC (43.75%) and spvC and gipA (12.5%) genes each. The isolates were highly resistant against Tetracycline and Ampicillin (93.75%, 15/16) followed by Nalidixic acid (50%), Ciprofloxacin (37.5%) Ofloxacin, Cefotaxime and Sulfisoxazole (25%) each, Chloramphenicol (12.5%) and Streptomycin (6.25%). Ten Salmonella (62.5%) isolates were multi drug resistant (MDR). The most commonly occurring resistance genes were gyrA (92.30%, 12/13), blaTEM (53.33%, 8/ 15), aadA1 and strA (50%, 2/4), sul1 (30.76%, 4/13) while tetA was not found in any of the isolates. Resistance to critically important fluoroquinolones and highly important Cephalosporin and Tetracy-cline antibiotics detected in Salmonella isolates is a serious threat to public health.
- ItemEffect of Frozen Storage on Physical and Chemical Quality Changes in White Leg Litopenaeus vannamei, Beheaded at Various Stages of Rigor(Society of Fisheries Technologists (India), 2022-08-02)In this study effect of severing skeletal muscle by beheading at different stages of rigor on the quality of pacific white shrimp Litopenaeus vannamei during frozen storage for a period of six months was investigated by physical, chemical and sensory evaluation. Moisture content, NPN and Sarcoplasmic protein showed a decreasing trend, whereastotalprotein content increased in all the treatments during frozen storage. pH value showed anincreasing  trend during the storage study in all the treatments.  TMA-N, TVB-N, Peroxide value and Thiobarbituric acid value also increased  in all the treatments during the storage study, however all the values were well within the acceptable limit.There was a significant decrease in the hardness, cohesiveness, springiness and chewiness in all the treatments during the storage. The final lower value of hardness was recorded in T3 indicating that serving of skeletal muscle in pre-rigor stage resulted in the better textural properties. The initial highest L* value was found in T2 followed by T1 and T3. Values of a* and b* showed a decreasing trends during the storage study indicating greener and blue colouration. Colour parameters showed significant differences (p<0.05) as storage progressed. Sensory score showed a decreasing trend with the storage reaching to the final value of as low as 6.38. However the shrimp were still acceptable after six months of frozen storage. There was not a significant difference among different treatments indicating that severing of skeletal muscle in different stages of rigor does not affect the quality of the shrimp.