Rajendran, C G; Dr.Damodaran,R(Cochin University of Science & Technology, 1995)
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Abstract:
The investigation was aimed at establishing the effect of salinity on the culture performance of Peneus Indicus in pokkali fields and also to find out the growth performance of the shrimp at varying salinities. The experiments were laid out at Rice Research Station, Vyttila of Kerala Agriculture University in three fields of area 1000 m2 each. The results of the experiment clearly establish that shrimps when stocked at higher salinity (20-25 ppt) for 45 days has given higher growth, survival and production than those stocked at lower salinity (10-15 ppt) in all the above parameters even when the culture experiment was maintained for longer periods in lower salinity. In the prolonged culture experiments conducted for 120 days in 10-25 ppt salinity, the results were poorer than the short period culture in higher salinity and the production values similar to lower saline culture. This clearly establishes the importance of salinity as an ecological factor which will have profound influence in shrimp farming operations.
Description:
Division of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology
Kuruvila, Mathew; Dr.Kurian, C V(Cochin University of Science And Technology, April , 1978)
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Abstract:
The present study was undertaken with a view to understanding some aspects of the morphology, bionomics and physiology of the sea anemone A.nigrescens. This species was selected for the study since it is abundantly available along the coast throughout the year and can successfully reared in the laboratory without much effort. The present study deals with the following aspects of A.nigrescens. description of the species, habitat, food and feeding, digestion, studies on salinity tolerance, studies on oxygen consumption, studies on tolerance to desiccation, asexual reproduction and regeneration.
Description:
School of marine sciences, Cochin University of Science And Technology
Cherian, C J; Dr.Kurian, C V(Cochin University Of Science And Technology, April 12, 1977)
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Abstract:
The present work comprises studies on the salinity tolerance
and respiratory metabolism of a mood-boring sphaeromid, Sphaeroma
annandalei, Stabbing and two free living,foulers of the family
Cirolanidae, Cirolana fluviatilis Stabbing and C. uilleyi Stabbing.
Except for the systematic accounts and general observations by
Pillai (1961) and the preliminary studies on the salinity tolerance
and respiration of C. fluviatilis by Nagabhushanam and Gopalakrishnamurthy
(1965, 1965a) very little is known about these isopods From
Indian waters. Studies by John (1968) on the habits, structure,
and development of Sphaeroma terebrans and by Cheriyan (1973) on the
eoéphysiology of the same are the recent major contributions on this
interesting group of animals. 5. annandalei is closely related to
S. terebrans and has been reported to occur on timber along with the
latter (Pillai, 1951). s. gggandalei is a serious pest attacking wood
along the Kerala coast, but detailed works on this species have not
been undertaken so Far
Description:
School Of Marine Sciences,Cochin University Of Science And Technology
Mohan, M V; Dr.Cheriyan, P V(Cochin University of Science And Technology, March , 1979)
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Abstract:
Teredinids (shipworms), a group of wood boring bivalves occurring in the Cochin Harbour region have been taken up for the eco-physiological studies. On the ecological part, the occurrence, abunance and seasonal intensity of the teredinids in relation to hydrographic conditions have been studied. On the physiological part, salinity tolerance and oxygen
consumption of the most commonly occurring shipworms, Nausitcra hedlgyi
and Teredo furcifera have been investigated. The hydrographic factors studied are temperature, salinity, dissolved oxygen, phosphate, nitrite, silicate and pH. The variation in temperature is found to be comparatively narrow. But seasonal variation in salinity, dissolved oxygen, phosphate, nitrite and silicate has been observed, with the highest values during the monsoon period. In the case of pH, the minimum value has been obtained during the low saline period and
the maximum value, during the high saline period. Of the various hydrographic factors studied, salinity has been found to be the most important fluctuating environmental parameter influencing the life of organisms in the habitat.
Description:
School of marine sciences, Cochin University of Science And Technology