Utilization of earthworms (Perionyx excavatus) as a protein source for growing fingerling marble goby (Oxyeleotris marmoratus) and tra catfish (Pangasius hypophthalmus)
Nguyen Huu Yen Nhi
Faculty of Agricultural and Natural resource, An Giang University,
Long Xuyen City, Vietnam
Biological characteristics and feeding behavior of two fish species
There are many reports on the effects of various animal wastes on growth and reproduction of earthworms. According to Chaudhuri and Gautam Bhattacharjee (2002), biomass production and reproduction of the earthworm Perionyx excavatus in four experiments with cow dung alone and in mixtures with straw, bamboo leaf litter or kitchen waste, showed maximum rate of biomass increase and reproduction in the mixtures with straw and bamboo leaf litter. Edwards et al (1998) reported that P. excavatus grew at similar rates in cattle manure, pig manure and aerobically digested sewage sludge, but the earthworms did not grow well in horse manure and grew only poorly in turkey excreta. However, the rate of growth and the time of maturation of this species were different under various population densities and temperatures between 15 and 300C. The highest rates of reproduction occurred at 25 0C both in cattle manure and sewage sludge. The species of earthworm also affects biomass production, fecundity and maturation. Surindra Suthar (2009) reported that the mean individual biomass of P. sansibaricus (768 mg) was higher than for P. excavatus (613 mg).
Read more: Utilization of earthworms