FT Vol.59(2)
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- ItemImpact of COVID-19 on Dry fish Production and Market-ing from India(Society of Fisheries Technologists (India), 2022-05-05)Drying is one of the oldest known techniques for preservation of fishes. Dry fish is a commodity which has demand both within and outside India. Indian dry fish exports contribute 7.45% to the total marine product exports valued at USD 156.94 million during 2020-21. The COVID-19 imposed lockdown led to disruptions in several segments of the economy and dry fish sector was no exception. The dry fish production is carried out as a smallscale activity along the coastal belt of the country providing source of livelihood for thousands of fisherfolk especially women. The dry fish value chain involves many players starting from fresh fish supplier, dry fish processor, dry fish agent, wholesaler, retailers and consumers. Owing to the outbreak of COVID-19 and the subsequent lockdown enforced from 24th March 2020, small scale dry fish processors suffered losses which have been estimated to the tune of Rs.0.5 to 1 lakh per month depending on the capacity of the unit. Women involved in household drying of fish experienced losses amounting to Rs.10,000 to Rs.12,000 per month. The dry fish exports from India, although seasonal has also registered a decline during the first three months of the pandemic and ensuing lockdown period. This paper presents an assessment of the impacts on the dry fish sector in the country.
- ItemA Study on the Influence of Bulbous bow on the Resistance of Fishing Vessel Hull form Using CFD Analysis(Society of Fisheries Technologists (India), 2022-05-05)Bulbous bow forms have a significant effect on the ship resistance components and are today an integral part of many ship designs. The hydrodynamic effect of the bulbous bow is based on the change of flow distribution around the bow, creating waves that interfere with the waves created by the hull, improving the flow around the bow. A properly designed bulb affects nearly all the hydrodynamic properties of the ship. The advancements in structural hydrodynamics is limited in Indian fishing industry and mechanised fishing vessels are not fitted with bulbous bows. This study illustrates the influence of bulbous bow on the resistance of fishing vessels. Computational Fluid Dynamics (CFD) analysis was used for optimisation of ship hull forms, full-scale predictions, and to appraise physical effects of bulbous bow. Geometrical 3D modelling of three reference hull forms namely conventional hull form, hull form with oval type bulbous bow and hull form with Nabla type bulbous bow created using Maxsurf software was chosen to perform test cases to evaluate the influence. Experimental data of three reference hull forms were collected for validation with results of CFD software. The CFD numerical setup stages were illustrated to estimate resistance components such as viscous resistance and wave making resistance. The mesh independency study of hull models were created with results of previous numerical studies. The comparison between the reference hull models and bulbous bow models show the amount of reduction in wave making resistance due to fitting of bulbous bow. The Nabla type hull form gave eduction in drag compared to the conventional hull form.
- ItemAlterations in the Growth and Haematological Response of Catla catla (Hamilton, 1822) Exposed to Different Salinities(Society of Fisheries Technologists (India), 2022-05-05)Investigation was carried out to study the effect of different salinities (3, 6, 9 ppt and control (0 ppt) on growth and haematological parameters of Catla catla juveniles having length and weight of 12.6±0.13cm and 18.26±0.07g respectively for about 30 days. The study revealed zero salinity (control) encouraged high growth (19.72±1.04 g), Specific Growth Rate (SGR) (0.52±0.13) and Protein Efficiency Ratio (PER) (3.08±0.26) at control than higher salinities. However, Food Conversion Ratio (FCR) was high at 9 ppt (7.30±2.04) and low at control (1.36±0.15). High leukocyte count was observed at 9 ppt (43.02±1.09) compared to control (36.87±0.50) whereas erythrocyte (2.29±0.19), haemoglobin (10.60±0.44) and haematocrit (31.53±1.12) were higher at control than at 9 ppt. Mean Corpuscular Volume (MCV) showed high at 3 ppt (141.14±09.98) while it was low at 9 ppt (131.79±13.46). Nevertheless, Mean Corpuscular Haemoglobin Concentration (MCHC) was high at zero salinity (33.64±1.17) and low at 9 ppt (28.34±1.050). Study inferred that alterations in the growth and haematological parameters occurred at higher salinities compared to lower salinity levels.
- ItemEffects of supplementation of shrimp head meal, chitin, chitosan and chitosan oligosaccharide in feed on the growth performance and survival in early post larval stages of Penaeus monodon (Fabricius 1798)(Society of Fisheries Technologists (India), 2022-05-05)Supplementation of shrimp shell by-products (shrimp head meal and chitin) and chitin derivatives (chitosan and chitosan oligosaccharide) in shrimp feed on feed characteristics, growth, survival and whole body composition of early post larvae of giant tiger prawns (Penaeus monodon Fabricius, 1798) was investigated. Five iso-nitrogenous diets were formulated with feed supplements viz., control (diet 1), shrimp head meal (SHM) at 6% (diet 2), chitin 5% (diet 3); chitosan 0.2% (diet 4) and chitosan oligosaccharide (COS) 0.2% (diet 5). Physical properties and proximate composition of the prepared feeds were compared. The experimental feeding trial was carried out for 30 days on early stages of post larvae of P. monodon. Growth performance and survival (%) were determined on 15th and 30th days of growth trial. Whereas, wholebody composition of P. monodon was determined at the end of the experiment. Physical properties of experimental feeds showed significant difference (p<0.05) in expansion ratio and water stability. Whereas, bulk density did not differ significantly. Higher body protein and survival rate were obtained for post larvae fed with diet 2, however, better growth performance was recorded for diet 4 (p<0.05). Significantly improved average weight gain (AWG), specific growth rate (SGR), feed conversion ratio (FCR), feed efficiency (FE), and protein efficiency ratio (PER) values were obtained for diet 4 on the 15th and 30th days respectively (p<0.05). Shrimp supplemented with 0.2% of chitosan was found superior compared to other diets. in improving the growth performance, survival, and composition of early post larval stages of P. monodon.
- ItemComparative Changes in the Quality of Pickles Preparedfrom Pacific White Shrimps (Litopenaeus vannamei) grownin Inland Saline Water and in Brackish Water duringStorage(Society of Fisheries Technologists (India), 2022-05-05)Rearing of Pacific white shrimp (Litopenaeus vannamei) in inland saline water, the non- natural environment and compromised or stressed condition, may affect the meat quality and flavour of the shrimp. In this study, an attempt has been made to develop shrimp pickles from inland saline water reared vannamei (ISRV) and compare its quality with that from brackish water reared vannamei (BWRV) at room temperature for 5 months. The pickles prepared from ISRV had tantamount protein (31.05% w/w), high fat (10.23% w/w) and low ash (6.79% w/w) content as compared with BWRV pickles, which had protein, fat and ash content as 29.55%, 9.32% and 7.74% respectively. No significant difference was observed in the sensory scores of the pickles. Trimethylamine, total volatile base nitrogen and total viable bacterial count were significantly increasing during storage, however, remained within the acceptable limits. The lipid oxidation and hydrolysis parameters like peroxide value and free fatty acid content increased during storage. It could be concluded that overall quality and shelf life of shrimp pickles prepared from ISRV was comparable with BWRV and there was no significant effect observed under storage conditions.