Studies on parasitic infestation of Nematopalaemon tenuipes Henderson, by Bopyrus squillarum Latreille at Bombay Part 1. Effects on size and growth of N. tenuipes

摘要

1.78% of Nematopalaemon tenuipes Henderson were found to be infected by the branchial isopodudparasite Bopyrus squillarum Latreille at Bombay. Both the sexes of N. tenuipes were equally infected and theyudshowed two peaks of infection - May and October, in all the three years from 1979 to 1981. The peaksudof infection were observed to coincide with the peak recruitment of N. tenuipes. The infected individuals wereudsmall, mostly below 50 mm in length. The size of the host and its parasite also showed a positive correlation.udThe parasite affected the growth by 34% and made the host stunted and weak in appearance whichudwas reflected in their length-weight relationship showing significant differences. Death appears to be causedudby the slow attrition caused by the blocking of the branchial surface by the parasite.