FT Vol.50(2)

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    Adoption of Improved Practices in Freshwater Fish Farming
    (Society of Fisheries Technologists (India)Cochin, 2013) Kappen, Daisy C; Thomson, K.T; Dinesh, K
    The study was undertaken to know the extent of adoption of improved practices in freshwater fish farming in the state of Kerala and to find out the relationship between the socio-psychological and economic characteristics of freshwater fish farmers with the level of adoption. One hundred fish farmers from all the 14 districts of Kerala were selected using proportionate random sampling technique. Data were collected with the help of a structured interview schedule. The results showed that majority (70%) of the respondents had medium level of adoption. Maximum adoption was observed in the practices of stocking the pond with selected species, followed by acclimatization of the seeds. Least amount of adoption was noticed in the case of maintenance of dissolved oxygen followed by application of inorganic fertilizer. The variables viz., information source utilization, social participation, marketing orientation and extension participation showed positive and significant association with level of adoption of the respondents, while risk orientation was negatively and significantly correlated. Twelve variables taken together for the multiple regression analysis explained 71% of variation in the adoption level. Out of the total 71% variations explained by the independent variables together, 70% was explained by the variables viz., occupation, information source utilization, risk orientation, marketing orientation and extension participation.
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    Degradation Analysis of Polyamide 6 Monofilament Fibers Coated with Thermoplastic Polyurethane Thin Films
    (Society of Fisheries Technologists (India)Cochin, 2013) John, Baiju; Furukawa, Mutsuhisa
    Degradation studies were conducted on high performance polyamide (PA) 6 monofilament fibers prepared with various types of thermoplastic thin film coatings. Polyether, polyester and polycarbonate based polyurethane thin film coatings were used with changes in the molecular weight of the polyols and NCO index. It was found that the thermoplastic coating significantly protected the core PA6 monofilament fibers from degradation, analyzed through sliding abrasive wear and accelerated weathering irrespective of the type and nature of the thermoplastic polyurethane (TPU) thin film coating. The structural and physical changes were analyzed after exposure to degradation tests. Polycarbonate based TPU thin film coated PA6 monofilament fibers showed significant resistance towards degradation factors as compared to the polyether and polyester based TPU thin film coatings. The TPU thin film coated PA6 monofilament fibers are potential candidates as material for fishing gear
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    Economics of Fish Production in Bharatpur District, Rajasthan, India
    (Society of Fisheries Technologists (India)Cochin, 2013) Kumar, Brijesh; Biradar, R.S; Debnath, Biswajit; Sharma, Rama
    Fish culture in Rajasthan is a promising sector and the potential for growth in the state is still far from exhaustion. Among the 32 districts of this state, Bharatpur has good potential for fish culture. The present study is based on a cross-sectional primary data collected from 60 farmers from this district through random sampling method under two different categories viz., farmers having own ponds (n=30) and farmers with leased ponds (n=30). Besides, analysis was carried out in small sized (<1 ha) and large sized farms (>1 ha) for both categories for a better understanding of production economics. The study indicated that fish farmers followed a low input based traditional type of fish farming. Higher average cost per ha was observed in smaller farm size (< 1 ha) for both owned and leased ponds. It was observed to be Rs. 57 129 and Rs. 65 774 for owned and leased small ponds against Rs. 46 194 and Rs. 24 950 for owned and leased large ponds. Level of productivity also followed a similar trend and it was higher in smaller ponds for both owned (2 538 kg ha-1 yr-1) and leased ponds (2 270 kg ha-1 yr-1) against the productivity of large ponds (1 230 kg ha-1 yr-1and 1 568 kg ha-1 yr-1 for owned and leased ponds respectively). Benefit cost ratio (BCR) was found to be 2.19 and 2.28 for owned and leased ponds respectively. BCR was higher in small owned ponds (2.34) when compared to small leased ponds (2.12). In the case of large sized ponds, it was higher in
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    Fish Consumers’ Behaviour at Selected Fish Markets of Tripura, India
    (Society of Fisheries Technologists (India)Cochin, 2013) Das, Apu; Kumar, Nalini Ranjan; Debnath, Biswajit; Barman, Debtanu; Datta, Manik
    Knowledge on preference for fish is important for producers and traders at micro-economic level and also for policy makers and planners at macroeconomic level. An attempt has been made to analyse the consumers’ preference for fish in Tripura. One hundred and sixty fish consumers were randomly selected from four wholesale-cumretail fish markets. The frequency, percentage analysis and Rank Based Quotient (RBQ) techniques were used to analyse consumers’ preferences and constraints. Highest preference was for freshwater local fishes (96.87% of the consumers). Among the species, 42% of consumers preferred rohu, 26% preferred catla and remaining 32% showed their preferences towards other fishes like mrigal, hilsa, pabda, carpio and tilapia. It was observed that 45% of the consumers was in the age group of 35-45 years and 53.75% had a family size of 5-7 members. Purchasing of fish was done mainly by the male members of the family (86.87%). Price (level & fluctuation) is the major constraint faced by the consumers of the state followed by availability of fish, lack of fresh fish, non availability of preferred species and lack of hygiene.
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    Organic Load Induced Black Gill Discoloration in Farmed Litopenaeus vannamei and its Mitigation Using a Pond Sanitizer
    (Society of Fisheries Technologists (India)Cochin, 2013) Babu, P. P. Suresh; Razvi, S. S. H.; Venugopal, G; Reddy, P. Rami; Mohan, K. Murli; Rao, P. Srinivasa; Acharyulu, V. N.
    In a nutshell, the present study indicates that the excess accumulation of organic matter will lead to pollution which in turn may lead to the black/brown discolouration in shrimps. But this specific problem can be overcome by the application of oxidising agents that reduces the organic load to safer levels. Better feed management practices are the simplest way to prevent pollution in shrimp ponds.
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    Quality evaluation of a battered and breaded seafood product under chilled storage
    (Society of Fisheries Technologists (India), 2013) Hassan, F.; Joshy, C.G.; Mathew, S.
    The quality evaluation and shelf life studies were conducted for a novel battered and breaded snack product named as ‘Oyster pablano pepper fritter’ prepared from edible oyster (Crassostrea madrasensis) under chilled storage. The organoleptic, chemical and microbiological quality attributes were evaluated for the product both in Ready-to-Fry (RTF) and Ready-to-Eat (RTE) form under chilled storage. There was significant decrease in moisture and organoleptic scores on storage. The levels of other indices like TMA-N, TBA-N, pH, TBA value, FFA value and PV showed significant increasing trend on storage for both the RTF and RTE products. Sensory quality attributes of products decreased on storage and under chilled storage, RTF samples got spoiled on 10th day and RTE products on 14th day as indicated by sensory scores.
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    Standardization of process parameters for ready-to-eat crab koftha in indigenous polymer-coated tin-free steel cans
    (Society of Fisheries Technologists (India), 2013) Abhilash, S.; Sreenath, P.G.; Ravishankar, C.N.; Gopal, T.K.S.
    Koftha is a traditional North Indian food consisting of whole cooked potatoes in spicy gravy. Fried crab balls with koftha medium was packed in indigenous polymer-coated easy open-end tin-free steel cans of 307 ×109 size and processed at 121.1oC to three different F0 values of 5, 6 and 7 with cook values of 61, 75 and 78 min respectively. The fried and processed crab balls were evaluated by sensory analysis, instrumental texture and colour analysis. Even though the processed cans for all three F0 values were found to be commercially sterile, the product processed to F0 6 was found to be ideal with regard to all sensory attributes. The one way analysis of variance of all the instrumental textural characteristics viz., hardness 1, hardness 2, cohesiveness, springiness, gumminess and chewiness of different thermal process treatments were found to be significant at 5% level of significance. The treatment means comparisons for instrumental textural characteristics of different thermal process treatments were performed using Tukey’s Test and the values were maximum for fried crab balls and minimum for crab balls processed to F0 6 except for gumminess which was minimum for F0 7. Considering the sensory and instrumental textural characteristics, F0 6 was identified as the optimum process for crab koftha.
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    Trawl selectivity on Johnius dussumieri (Cuvier, 1830) along Gujarat, northwest coast of India
    (Society of Fisheries Technologists (India), 2013) Madhu, V.R.; Panda, S.K.; Meenakumari, B.
    The codend selectivity of Johnius dussumieri, an important resource targeted by trawlers along Gujarat coast was studied. Covered codend method was used to derive the selection parameters of J. dussumieri using a 40 mm diamond mesh codend. Stacked haul method was used to derive the selection parameters which were utilized for deriving the selectivity estimates. The data on the escapement through experimental codend collected from 6 hauls were used for the analysis. The length at 50% retention (L50)±SE of the species was derived as 7.55 ±0.12 cm. The selection range was worked out as 3.41 ±0.18 cm, selection factor as 0.19 and the selection ratio as 0.45. Considering the length at first maturity to be 122 mm, the optimum mesh size required in the codend (diamond mesh) for conservation of this species was found to be 64.2 mm.