The free-living nematode Panagrellus redivivus was used as a feed to replace microalgae during the protozoeal (PZ) stage of Penaeus indicus and Anemia nauplii during the mysis and early post-larval (PL) stages. The nematodes promoted higher survival and similar growth and development when fed as an Artemia replacement. Adequate feeding density of the nematodes was 30/ml during PZ stages and 60/ml during subsequent stages to metamorphosis. Larvae fed nematodes from the first feeding stage to PL displayed comparable survival (p lt 0.05) but lower growth and slower development than those fed algae plus Artemia (p lt 0.05). Provision of algae as a co-feed with the nematodes for 24 hours significantly improved the survival and growth during larval development (p lt 0.05). Larvae fed nematodes and algae from PZ1 to PZ2 had significantly higher trypsin activity than those fed nematodes alone (p lt 0.05). It is concluded that algal co-feed significantly induces endogenous enzymes in larvae, enhancing digestion of the nematodes.
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