Effects of feeding rate and sediment depth on the survival, growth performance, and biomass of mud polychaete Marphysa iloiloensis from early juvenile to adult in grow-out tanks
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Polychaete aquaculture has progressed in some countries to meet the high demand of fish bait and aquaculture industries. However, knowledge on the aquaculture requirements of polychaetes in the grow-out is still scarce. The present study aimed to determine the optimal feeding rate (FR) and sediment depth (SD) for the grow-out culture of mud polychaete Marphysa iloiloensis from early juvenile to adult stage. The effects of two FRs (50 and 100 g m−2) with three different levels of SD (2, 3, and 5 cm) on M. iloiloensis survival, growth performance, and biomass were evaluated. The study was performed in a 2 × 3 factorial experiment using completely randomized design with four replicates per treatment that lasted 120 days. Early juveniles (30 days old) were stocked in glass tanks at 1000 individuals m−2 and grown for 120 days (herein refer as 'adult', with musculature and capable of reproduction). Regardless of FR, M. iloiloensis had the highest survival of 45 ± 2% in 5 cm SD but statistically comparable to 3 cm SD (34 ± 5%), while survival was significantly lowest in 7 cm SD (26 ± 3%). The levels of nitrite (NO2) and total ammonia nitrogen (TAN) was significantly higher in the rearing water of 100 g m−2 FR than in 50 g m−2 FR. Higher FR resulted to poor water quality and appeared to contribute to the low M. iloiloensis survival in 100 g m−2 FR. Growth performance was similar among treatments. There was a significant interaction between FR and SD on M. iloiloensis biomass (p < 0.05). In 50 g m−2 FR, no difference was observed in the different levels of SD while in 100 g m−2 FR, biomass was significantly higher in 5 cm SD than in 7 cm SD (p < 0.05). M. iloiloensis biomass in 50 g m−2 FR was higher compared to 100 g m−2 FR, regardless of the SD. Overall, the culture of M. iloiloensis using 50 g m−2 FR in 3–5 cm SD showed the best survival and biomass. Based on these findings, it is recommended that the grow-out culture of M. iloiloensis from early juvenile to adult should follow the 50 g m−2 FR and should be done in tanks with 3–5 cm SD to improve production.
Mandario, M. A. E., Castor, N. J. T., & Balinas, V. T. (2021). Effects of feeding rate and sediment depth on the survival, growth performance, and biomass of mud polychaete Marphysa iloiloensis from early juvenile to adult in grow-out tanks. Aquaculture, 737731. https://doi.org/10.1016/j.aquaculture.2021.737731
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