FT Vol.17(2)
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- ItemSalinity and Survival of Martesia striata (linn) in Cochin Harbour(Society of Fisheries Technologists (India) Cochin, 1980)The effects of salinity vanatwns on the survival of M artesia striata from Cochin Harbour are presented. It is observed that at least a few of the animals survive the low saline conditions during monsoon. Laboratory experiments showed the lethal salinity as 6 ~~o when animals acclimatised in 34 %o were subjected to abrupt changes in salinity. But acclimatisation to 17 %o salinity showed a downward shift in the lethal salinity to 4%0 • The present observations indicate that M. striata is euryhaline arid the extent of tolerance to lower salinities depends on the degree of acclimatisation.
- ItemProtein Concentrate from Shark(Society of Fisheries Technologists (India) Cochin, 1980)A simple method of leaching the minced muscle with water repeatedly followed by cooking, pressing, drying the cake and powdering has been described for the preparation of :fish protein concentrate (FPC) from shark without the use of solvents. The FPC thus prepared had a high protein content and was completely free of urea. It contained all the essential amino acids in a balanced proportion with a high lysine content and had a storage life upto 12 months. This product can be used for the fortification of bread, biscuits and 'chappathis' respectively at 10, 5 and 2% levels.
- ItemPreparation of Edible Powder from Jawla (Acetes sp.) Prawns(Society of Fisheries Technologists (India) Cochin, 1980)Four methods were employed for the preparation of prawn powder in this study.In the first method fresh jawla prawns were thoroughly washed with potable water to remove slime and dirt and were spread in thin layers on shelves of a hot oven at 40°C. After 24-28 h drying, prawns were pulverized to a fine powder in a table mill and sieved using a sieve of 3600 meshes/sq. inch; moisture, protein, fat,ash and bacterial load of the powder were determined. In the second method, prawns were washed and oven dried at 60°C for 8-10 h, pulverized to a fine powder and studied as described above. In the third method the washed jawla prawns were beheaded, washed again and oven dried at 40°C for 24-28 h and powdered. In the fourth method the sun dried prawns procured from the market were dried for 4-6 h in oven at 40°C and used.
- ItemHydrography of Fishing Grounds of Arabian Sea off Mangalore(Society of Fisheries Technologists (India) Cochin, 1980)Hydrographical parameters, namely temperature, salinity, disi>olved oxygen and density of the fishing grounds off Mangalore extending over an are2. of ca 850 km2 have been studi~d during March 1976-March 1977. Twelve stations o.long three transects up to 50 m Isobath were located for sampling. The vertical distribution of temperature show three distinct phases, namely, a period of conspicuous variation, a short intermedjary phase and a period of thermal stability. The disso]ved oxygen of the bottom waters was drastically low during September. Salinity :fluctuations were not considerable between months an~ depths. Dense waters existed over the shelf region, especially along the bottom dunng Septemb~r and to a certain extent in October also. The distribution patterns of temperature, dtssolved oxygen . and density cl~arly indicate the movement of cold, dense, oxygen-poor- bottom waters from greater depths to the upper reaches of the shelf during September
- ItemFat and Water Contents of The Muscle and Gonad of Otolithus argenteus in Relation to Gonad Growth(Society of Fisheries Technologists (India) Cochin, 1980)Fat and water contents of the muscles and gonads in relation to gonad growth in Otolithus argentes from Karwar are reported. Water content showed an inverse relationship to lipid in both the sexes. Variation in somatic body weight was found associated with the fluctuations in Jjpid contents.