EFFECT OF PARTIAL SUPPLEMENTATION OF DUCKWEED (LEMNA MINOR) ON GROWTH AND SURVIVAL OF LABEO ROHITA (HAMILTON, 1822) , 1822) , 1822) FRY

Abstract

The acceptable nutritional value of Lemna as an ingredient in diets for Labeo rohita fry was experimented under aquarium culture system for 60 days. For that purpose fry of approximately equal weight(51.70 mg ± 1.18)were distributed in groups of 15 to each four aquaria at 0% (T1), 10% (T2), 20% (T3), 30% (T4) and 40% (T5) inclusion levels of Lemna. Maximum mean weight gain (136.19 ± 26.85 mg) was observed in T1 and minimum (106.11 ± 36.60 mg) was observed in T5 at the end of the experiment.Among the treatments tested, the highest survival (86.66% ± 9.43) was recorded in treatment T3 and minimum was found in T5 (41.66% ± 13.74). Lowest FCR was recorded in treatment T3 (2.36 ± 0.55) and highest was found in T5 (2.65 ± 0.14).Higher SGR was observed in treatment T1 (226.98 ± 44.74%) and minimum was observed in T5 (176.84 ± 61.00%). Higher PER was observed in Treatment T3 (1.10 ± 0.22) and minimum was found in T5 (0.34 ± 0.31).The study clearly showed that fry fed diet of 20% duckweed dietary inclusion performs best result and fishmeal was non replaceable but can be supplemented with duckweed up to an optimum level to produce cost effective feed.