International Journal of Aquaculture, 2017, Vol.7, No.24, 159-165
163
at E = 0.014. The present E (0.53) has not exceeded the optimum exploitation rate (Emsy = which maintain the 50%
of the stock biomass). The optimum yield per recruit is 0.017 g. It is suggested that for attaining the maximum
yield the fishing pressure could be increased by 0.53% from the present level L50/L∞ value are given in the
Figure 7.
S. gibbus
, the studies showed that the urgent need to conserve parrot fish stocks of Tuticorin coast, India.
Robertson et al. (1999) study revealed that the all coral reef fishes to extended life-spans, slow growth rates
(tropical/temperate region), low natural mortality rates that the indication of marine species vulnerable to
extinction through man-kind activities, to alarm of overexploitation.
Figure 6 Yield/Recruit and Biomass/Recruit of
Scarus gibbus
Figure 7 Yield isopleth of
Scarus gibbu
Authors’ contributions
Dr. V.K. Venkataramani, Dean and Principal Investigator, ICAR/NATP/CGP Mode project, and Dr. Vaitheeswaran Thiruvengadam,
Senior Research Fellow, ICAR/NATP/CGP Mode project, he has been working as Senior Researcher of this project, he was
involving and dedication of the project, sixteen species of stock assessment of marine ornamental finfishes and length frequency data
collection, catch and effort data assessment, various parameters has been analysis and biodiversity assessment of marine
ornamental of Gulf of Mannar, India, FiSAT package analysis in this coast.
Acknowledgements
The authors are thankful to Indian Council of Agricultural Research, National Agricultural Technology Project, New Delhi, India, for
providing funding facilities. I wish to thank Vice Chancellor, TamilNadu Veterinary and Animal Sciences University, Chennai,
TamilNadu, India for providing all facilities and laboratory instruments, encouragements and supports.
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