FT Vol.23(1)

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    DoI Net Fishery off Nawabunder (Gujarat)
    (Society of Fisheries Technologists (India) Cochin, 1986) KHAN, MOHAMMAD ZAFAR
    Extimated catch of 6,484.9; 3,505.6 and 4,797.7 t of fishes were landed at Nawabunder in 'dol.' net during 1976-77, 1977-78 and 1978-1979 respectively. There has been an increasing trend. in effort and decline in catch and catch rate. The catch rate came down from 174.8 kg in 1976-77 to 84 kg in 1978-79. The detailed studies on the catch composition revealed that the Bombay duck formed about 68.6 - 77% of the total catch. The other important constituents being Coilia dussumieri 1.5 9.2%, ribbon fish 3.0 - 6.5%, non-penaeid prawn, namely, Acetus indicus, Nematopalaemon tenuipes and Hippolysmata ensirostris together formed about 6.1 - 13.7% and penaeid prawns 1.5 - 3.1% of the total `dol' net landings. In addition, quality fishes such as `ghol', 'warn', pomfret and catfishes were also landed in considerable quantities. The landings of `ghol' is on the increase from 4.9 t in 1976-77 to 59 t in 1978-79. Large number of juveniles of economically important fishes namely, Harpodon nehereus, Pampus argenteus, Trichiurus lepturus and Ilisha filigera have been observed in the catch particularly during February-May. The destructive nature of the gear has been commented along with the suggestions for regulation of the fishery.
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    Hydrobiological studies of an irrigation Tank with Reference to the culture of Large Murrel,Channa marulius (Hamilton) and Striped Murrel Channa striatus (Bloch)
    (Society of Fisheries Technologists (India) Cochin, 1986) George, J.P; Venugopal, G; Hingorani, H.G; Venkateshvaran, K
    The importance of selection of species for culture according to the ecological niches and fish food organisms is highlighted with respect to the Fox sagar,an irrigation tank.The tank was infested withsubmerged vegetation as well as minnows and weed fishes which rendered the tank unsuitable for the culture of Indian major carps.Therefore ,the tank was stocked with 8000fingerlings of Channa marulius and C.stiatus during 1981 by the local fishermen co-operative society.Only partial harvest was possible during 1982 because of high water level .The final harvest was done by the members of the society using conventional traps dragnets and castnet in april-may 1983
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    On the eye diameter- Total length relationship of the Indian Mackerel Rastrelliger Kanagurta (Cuvier)
    (Society of Fisheries Technologists (India) Cochin, 1986) UDUPA, K. S; BHAT, C. H. KRISHNA
    791 mackerel along the coast Karnataka during 1979-80 season was studied for total length-eye diameter relationship. It was found that mackerel having the eye diameter range 0.5 to 0.9 cm belong to 1 year old group, 1.0 to 1.2 cm to 2 year old group and 1.3 to 1.5 cm to 3 year old group. Among the many morphemetric characters, eye diameter of fish has attracted little attention in the field of fishery research. When compared to other morphometric characters, eye diameter seems to have no significant role to play in taxonomical work. The present note aims in correlating the eye diameter of the Indian u ackerel R. kanagurta to total length and hence to age of the fish.
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    Oxygen Consumption Under Copper and Zinc Stress in Perna viridis
    (Society of Fisheries Technologists (India) Cochin, 1986) PRABHUDEVA, K. N; MENON, N. R
    The rate of oxygen consumption by Perna viridis pre-exposed to copper and zinc was studied. Those test individuals pre-exposed to various zinc concentrations showed variability in oxygen consumption irrespective of concentrations and preexposure period. While those animals pre-exposed to various copper concentrations registered decrease in oxygen consumption at concentrations above 0.06 p.p.m. copper, pre-exposure to concentrations below 0.02 p.p.m. copper did not result in any clear cut change in the rate of oxygen consumption.
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    Preservation of Indian Oil Sardine (Sardinella Longiceps) in ice and chilled seawater.Part II - Changes During Storage with Particular Reference to salt Penetration and Lipid Deterioration During C S W Holding*
    (Society of Fisheries Technologists (India) Cochin, 1986) KRISHNAKUMAR, S; HIREMATH, G. G; MENON, N. R
    Oil sardines in prime condition were chilled onboard. Two lots were chilled in CSW (samples C & CI), one lot ice (sample I) and a fourth lot was left un-iced on deck (sample AI). Sample AI was iced after landing and sample CI was taken out of the chilled seawater and. iced. All the four samples were kept in a chilled room for storage studies. Sample C, chilled and stored in CSW, recorded a gradual gain in weight and an increase in salt content of the muscle. Presence of salt did not seem to cause any excessive protein denaturation. Salt extractability decreased at a gradual rate in all cases. Presence of salt seemed to wield no noticeable influence on lipid hydrolysis and subsequent peroxidation. Results of chemical and sensory evaluations highlight this. Holding sardines in CSW gave a product of excellent quality for the first four to five days of storage. Beyond the fifth day of storage quality deteriorated rapidly and there was no noticeable superiority for this sample (sample C) over the onboard iced fish. This was evident in the sensory evaluation as well. However, a storage life of five days in a readily acceptable state is sufficient for the fish to be disposed in the market at a premium sale price over other landings of the same species.
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    Temporal Behaviour of Marine Landings Along Coastal Karnataka III.Cyclical Patterns*
    (Society of Fisheries Technologists (India) Cochin, 1986) GADAGKAR, SUDHINDRA R.; SUNDARARAJ, N
    Marine landing data for Karnataka during 1956-1978 were subjected to timeseries analysis and cyclical periodicities isolated in the case of seven fisheries namely, ribbon fish (five year cycle); Caranx spp., Leiognathus spp, and mackerel (six year cycle each); the combined landings of Hernirhamphus spp. and Belone spp., 'Lesser Sardines' and 'Other Clupeids' (seven year cycle each). 'Total' demonstrated an eight-year cyclical periodicity.