PERKEMBANGAN POST-LARVA IKAN NILEM Osteochilus hasselti C.V. DENGAN POLA PEMBERIAN PAKAN BERBEDA

Didi Humaedi Yusuf (1) , Gratiana E Wijayanti (2) , Sugiharto Sugiharto (3)


(1) Fakultas Biologi, Universitas Jenderal Soedirman
(2) Fakultas Biologi, Universitas Jenderal Soedirman
(3) Fakultas Biologi, Universitas Jenderal Soedirman


Abstract


Failure of adaptation in feed utilization can result in larval mortality. Post-larval stage is a critical period of fish development in which transition from internal feeding to external feeding occurs. This study aimed to determine the growth and survival of hard-lipped barb (Osteochilus hasselti C.V.) post-larvae fed with different feeding patterns. The experiment was conducted on an experimental basis with a completely randomized design (CRD). The treatments consisted of (P1) 100% Spirulina sp., (P2) 75% Spirulina sp. + 25% pellet powder, (P3) 50% Spirulina sp. + 50% powder pellet, (P4) 25% +75% sp Spirulina pellet powder, and (P5) 100% powder pellets. Day 1 post-hatching larvae were reared in aquaria with density of 17 fish / L for 8 weeks. The larvae were fed as much as 5% of the total weight of biomass. Post-larval development was evaluated by observing the development of the larvae morphology, the body length (every week), the biomass weight (every 2 weeks), and calculating their survival rate at week 8. Morphological data were analyzed descriptively. Data on body length, biomass weight and survival were analyzed using two-way ANOVA followed by LSD test. The results showed that the feeding pattern significantly affected the development of post-larvae (p<0.05). The most advance post-larval development was obtained from the post-larvae fed with 100% pellet powder. In this group, morphological characters of post-larvae in the first week were the mouth start opening, the skin was pigmented, and gall bladder in bi-lobes shaped, caudal fin and dorsal fins were differentiated. Completion of fins development was achieved by the third week when the post-larvae have adult morphological character. The highest body length and biomass weight of the post-larvae was obtained in the group fed with100% of pellets and the highest survival rate was found in the group fed with combination of 50% Spirulina sp. + 50% pellet powder (P3).


Keywords


Osteochilus hasselti;post-larvae development; survival rate; Spirulina platensis

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