NATURAL FEED (ROTIFER) MANAGEMENT ON ORANGE SPOTTED GROUPER Epinephelus coioides LARVAL REARING

Abstract

According to Indonesian Standard Quality, the optimal seed production of orange spotted grouper (Epinephelus coioides) Keywords: rotifers, feeding time, Orange Spotted grouper larvae, Epinephelus coioides ABSTRAKProduksi benih ikan kerapu lumpur (Epinephelus coioides) dalam jumlah yang optimal dan kualitas yang sesuai Standar Nasional Indonesia (SNI) masih belum dapat dipenuhi, seiring dengan terjadinya berbagai kendala selama periode pemeliharaan larva. Upaya pemeliharaan larva secara masal telah dilakukan dalam penelitian ini dengan mengoptimalkan pemberian pakan alami (rotifer). Tujuan penelitian adalah untuk mendapatkan informasi lama waktu pemberian pakan alami (rotifer) secara tepat sehingga dihasilkan kelangsungan hidup yang tinggi. Perlakuan berupa pemberian rotifer sampai larva berumur (A) 20 hari, (B) 25 hari, (C) 30 hari, dan (D) 35 hari. Rotifer yang diberikan terlebih dulu diperkaya dengan DHA Selco. Penelitian menggunakan wadah fiber kapasitas 1 m 3 yang diulang 3 kali dan dilaksanakan dengan rancangan acak lengkap (RAL). Pemeliharaan larva dilakukan hingga mencapai fase juvenil (D 45 ). Hasil terbaik dari perlakuan tersebut diterapkan untuk pemeliharaan larva secara masal dengan menggunakan wadah bak beton kapasitas 6m 3 dan 10m 3 . Hasil penelitian menunjukkan bahwa pemberian rotifer hingga larva berumur 25 hari pada wadah fiber (1 m 3 ) menghasilkan sintasan tertinggi sebesar 7,63%, sedangkan pada pemeliharaan secara masal (6 m 3 dan 10 m 3 ) dihasilkan sintasan masing-masing sebesar 4,9±3,54% dan 8,8±2,26%. Tingkat keseragaman ukuran benih cukup tinggi (80%) dan persentase abnormalitas benih relatif rendah (0,4%).

Enhanced larval survival in orange‐spotted grouper ( Epinephelus coioides ) using optimized feeding regime

“…and Oithona sp.) (Toledo et al, 1999) to 8.8 ± 2.26% when using different combinations of feed and tank size (Aslianti & Setyadi, 2014) and finally to 9.3 ± 4.9% when fed with rotifers and pond collected copepods (Yousif et al, 2016). Fourooghifard et al (2017) had reported maximum larval survival of 16 ± 9.94% after 30 days of rearing; however, at metamorphosis on 43 DPH, survival rate was not estimated and, therefore, results appear inconclusive.…”

“…Optimizing the feeding protocol during various phases of larval rearing culminated in a larval survival rate, which is the highest ever recorded for the species. Earlier workers (Aslianti & Setyadi, 2014; Doi et al, 1991; Duray et al, 1997; Lim, 1993; Su et al, 1997; Toledo et al, 1999; Yousif et al, 2016), during larval rearing for orange‐spotted grouper, had not attempted to optimise the densities and combinations of live feed, and their supplementation during larval rearing was more depending on the availability rather than on the requirement. Therefore, optimum larval survival for orange‐spotted grouper has never been achieved.…”

“…and Oithona sp.) (Toledo et al, 1999) to 8.8 ± 2.26% when using different combinations of feed and tank size (Aslianti & Setyadi, 2014) and finally to 9.3 ± 4.9% when fed with rotifers and pond collected copepods (Yousif et al, 2016). Co-feeding of screened and enriched rotifers with nauplius of Parvocalanus crassirostris at 2 copepod nauplii +10 rotifers ml −1 drastically improved the survival during initial feeding for orange-spotted grouper larvae.…”

“…Copepods, when fed an adequate mixture of microalgae, are excellent sources of highly unsaturated fatty acids (HUFA's), docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA) and arachidonic acid (ARA) (Ajiboye et al, 2011; Støttrup & Jensen, 1990; Watanabe et al, 1983). Nevertheless, larval survival up to metamorphosis was usually low, <10% with an average of 4% (Aslianti & Setyadi, 2014; Rimmer, 2000).…”

Identificaton of grouper parasites (Epinephelus coioides) in Talawi District, Batubara Regency

“…Environment is the most important factor for grouper cultivation in ponds or KJA (Rumondang et al, 2020); (Annur et al, 2021). The growth of grouper is relatively rapid; consequently, both the local market and the export market can be satisfied (Aslianti and Setyadi, 2015).…”