Rearing Silver Therapon Leiopotherapon plumbeus (Teleostei: Terapontidae) Larvae Using Euryhaline Rotifers as Starter Food

Authors

Frolan A. Aya, Binangonan Freshwater Station, Aquaculture Department, Southeast Asian Fisheries Development Center, Binangonan, Rizal 1940, PhilippinesFollow
Vicar Stella Nillasca, Binangonan Freshwater Station, Aquaculture Department, Southeast Asian Fisheries Development Center, Binangonan, Rizal 1940, Philippines
Luis Maria B. Garcia, Institute of Biology, College of Science, University of the Philippines Diliman, Quezon City 1101, PhilippinesFollow

Publication Date

12-1-2021

Abstract

The silver therapon Leiopotherapon plumbeus is an important but dwindling freshwater food commodity in the Philippine freshwater habitats. The influence of feeding regimes on growth performance and survival of first-feeding silver therapon larvae fed euryhaline rotifers (Brachionus rotundiformis and B. plicatilis) as starter food was examined. Larvae at two days post-hatch (DPH) (1.93 ± 0.07 mm; 200 larvae/basin) were initially reared on rotifers for 12 days followed by Artemia nauplii from 14 to 35 DPH as follows: (A) B. rotundiformis from 2-13 DPH; (B) B. rotundiformis from 2-7 DPH and Moina micrura from 8-13 DPH; and (C) B. plicatilis from 2-13 DPH. After 35 days of rearing, mean survival rates were significantly higher in larvae fed B. rotundiformis (69.2%) than those co-fed B. rotundiformis and M. micrura (34.6%) or B. plicatilis alone (26.3%). Higher ingestion rates were observed for B. rotundiformis-fed larvae (1.6 ± 0.5 to 4.4 ± 0.5 ind larvae-1) than larvae fed B. plicatilis (0.0 to 3.2 ± 0.8 ind larvae-1) during the critical initial feeding stage. However, larvae fed B. plicatilis (20.75 ± 0.48 mm) were significantly longer than those fed B. rotundiformis alone (15.62 ± 0.40 mm) or co-fed B. rotundiformis and M. micrura (18.57 ± 0.58 mm). The fastest growth was observed in larvae fed B. plicatilis, with length increment (LI) and specific growth rate (SGR) of 18.8 mm and 6.8% day-1, respectively. Eye diameter, head length, snout length and pre-anal length increased but were not affected when larvae were fed two rotifer species. These results demonstrate that feeding euryhaline rotifer B. rotundiformis from 2 to 13 DPH followed by Artemia is a suitable feeding regime for better survival of silver therapon larvae under laboratory rearing conditions.

Recommended Citation

Aya, Frolan A.; Nillasca, Vicar Stella; and Garcia, Luis Maria B. (2021) "Rearing Silver Therapon Leiopotherapon plumbeus (Teleostei: Terapontidae) Larvae Using Euryhaline Rotifers as Starter Food," The Philippine Agricultural Scientist: Vol. 104: No. 4, Article 5.
Available at: https://www.ukdr.uplb.edu.ph/pas/vol104/iss4/5