Devasia, K V; Dr.Balakrishnan, K P(Cochin University of Science and Technology, November 10, 1983)
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Abstract:
This thesis Entitled Biology of Decapod crustaceans in different Environmental conditions. Prawn culture is practiced in Kerala in two types of fields namely seasonal and perennial; In seasonal fields paddy is grown during the monsoon period and prawns are cultured during the rest of the year. when compared to seasonal fields; perennial fields are subjected to much fluctuations in its environmental characteristics. The perennial fields were found more productive than seasonal fields. The benthic production in perronial fields were almost double that of seasonal fields. But in the matter of species diversity both fields were equal. Seasonal changes were observéd in the species abundance of benthic organisms in both the seasonal and perennial fields. Both isometric and allometric growth were noticed in P. indicus .But during most of the months the growth was near to isometric. The condition of the prawn also fluctuated between better and poor.During most of the months the prawn in perennial fields wore in good condition while in the seasonal fields the condition changed from year to year. This indicates that the perennial field provides a better habitat for P. indicus.
Description:
School of Environmental Studies, Cochin University of Science and Technology
Gopinathan,C P; Dr.Ramachandran Nair,P V(Cochin University of Science and Technology, December , 1981)
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Abstract:
This thesis deals with the results oi’
investigations on phytoplankton productivity and related
aspects conducted in various ecoaystms such as estuarine,
inshore and oceanic enviroments and certain special
ecosytans including the pu.-awn culture fields and associated
many-eves, mud bank and the seas around the Andaman-Nicobar
Islands. This study also includes the qualitative and
quantitative variations of phytoplankton production, their
seasonal abundance, factors controlling the same and the
magnitude of the potential resources derived 1!:-om it