FT Vol.44(2)
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- ItemStorage Characteristics of Restructured Ready-to-Cook Imitation Shrimp Fingers under Refrigerated Storage at 40C(Society of Fisheries Technologists (India)Cochin, 2007)The imitation shrimp fingers (ISF) prepared from Nemipterus bleekeri were packed in air pack and vacuum pack and stored at 40C. Quality characteristics viz. proximate composition, biochemical, microbial and sensory characteristics were investigated and shelf life determined. Salt (NaCl) concentration of 1.5% with sucrose concentration of 1% and setting process at 40oC with 20 min duration were found to be optimum for good gel formation. The moisture, protein, fat and ash contents remained almost unchanged during storage. pH gradually decreased while TMA-N and TVB-N contents increased during storage period. Microbial parametrs such as total plate count, staphylococcal count and psychrophilic counts also increased significantly. Organoleptic evaluation revealed that the air packed samples had the storage life of 15 days while vacuum packed samples had the shelf life of 18 days. One day icing of fish before processing did not affect the quality of ISF under same experimental conditions
- ItemTraditional Riverine Fish Catching Devices of Assam(Society of Fisheries Technologists (India)Cochin, 2007)Traditional riverine fish catching devices operated in the Barak, Dhaleswari, Jatinga, Brahmaputra, Dhansiri and Dorika rivers, in Assam have been studied with regard to their structure, operation and productivity. The study revealed the occurrence of 18 types of fish catching devices, which have been categorized into seven groups, viz., (i) hook and line gear (lar barshi and kupa barshi), (ii) traps (dori, polo, dhu, hogra and chairon jal), (iii) towed gear (km jal and pelain jal), (iv) dip nets (dheki jal and dorar jal), (v) entangling gillnets (patan jal ), (vi) seines (maha jal, pan jal and basta jal) and (vii) falling gears (jhaki jal, rekh jal and utar jal). The trap polo of river Dorika obtained the highest catch per man-hour (22.52 kg) followed by jhaki jal in river Brahmaputra (1.11 kg) and polo in river Barak (1.00 kg). Maha jal, though a massive gear, has given poor catch per man-hour (< 0.005 kg).
- ItemSimulated Live Transportation of Fishes in Tanks Under Light and Dark Conditions(Society of Fisheries Technologists (India)Cochin, 2007)Live fish command higher price in the fresh fish market than dead iced fish. Preliminary trials were held to find the effect of light and dark conditions on live fish transportation for the fresh fish market. Sub-adult Rohu (Labeo rohita) of 220-250g were held at high density (130 fish.m"3) in aquarium and plastic tank to simulate live fish transportation conditions. The effect of light and dark conditions on oxygen consumption, ammonia build-up, pH and temperature were monitored during the study. Average rates of decrease in dissolved oxygen (DO) were highest under full light conditions (3.2ppm DO.h"1) followed by semi dark and least in fully dark conditions (1.94 ppm DO.h"1). Similar results were seen when fish were held in plastic tanks as well. Increased levels of salinity in water decreased the DO depletion rates (1.5-1.98 ppm DO.h"1). Ammonia concentrations increased rapidly under fully dark conditions in presence of 0.9 and 1.1% salt (0.8-1.59 ppm NHj.h"1). Lowest rates of increase in ammonia concentrations were seen under full light conditions (0.68 ppm NHj.h"1). The pH under all conditions of holding decreased steadily in spite of the increase in ammonia. It is concluded that dark conditions are beneficial for live fish transportation provided the fecal matter could be removed effectively to counter the build-up of ammonia.
- ItemInvestigation on the Shelf Life and Changes of Lipid and Fatty Acid Composition of Sturgeon (Acipenser stellatus) in Frozen Storage(Society of Fisheries Technologists (India)Cochin, 2007)A study was carried out on the shelf life, fatty acid composition and changes in lipid profile of Sturgeon (Acipenser stellatus) from the Southern Caspian Sea for twelve months in frozen storage at -220C. Fresh fish tissue had 84.41% unsaturated fatty acids whereas in the case of twelve month frozen samples it was 77.45%. Significant amount of polyunsaturated fatty acids (PUFA) was present in the samples. The amount of tissue lipid (9.71%) and co- 3 fatty acids (16.64%) has come down to 8.03 and 8.98%, respectively during frozen storage. The peroxide value increased to 20.11 meq/kg by twelve months in frozen storage from the initial level of 7.24 meq/kg. There were significant variations in the amount of some fatty acids like myristic, a - linolenic and arachidonic acids. Significant difference was also observed in co-3 and co-6 fatty acids series during frozen storage. The results of this study indicate that the maximum shelf life for Sturgeon is up to six-months in frozen storage.
- ItemInfluence of Extract Isolated from the Plant Sesuvium portulacastrum on Growth and Metabolism in Freshwater Teleost, Labeo rohita (Rohu)(Society of Fisheries Technologists (India)Cochin, 2007)Fishmeal, containing high protein content is becoming very expensive and the search for locally available growth enhancing plant extracts has gained wide acceptance in the present aquaculture scenario. Crude aqueous extract of a plant Sesuvium portulacastrum (Linn) at 10% concentration was evaluated for its effect on growth of Labeo rohita by incorporation in diet. The growth performance was evaluated for a period of 90 days in three phases of 30 days duration. Parameters like length, weight, food conversion efficiency (FCE), food assimilation efficiency (FAE), specific growth rate (SGR), protein and nucleic acid contents were studied. The results indicated significant enhancement of growth in L. rohita fed with diet containing S. portulacastrum extract