Spawning, larval development, and juvenile rearing of white teatfish Holothuria fuscogilva in the hatchery in the Philippines
2022
Arriesgado, D.A. | Uba, K.I.N. | Tubio, E.G. | Navarro, V.R. | Bucay, D.M. | Besoña, J.F. | Magcanta-Mortos, M.L.M. | Uy, W.H.
The significant exploitation of the high-value white teatfish, Holothuria fuscogilva, has raised global concerns about the species' wild populations. Aquaculture technology development may potentially restore dwindling stocks; however, it remains to be established in the Philippines. This study reported the first successful mass production ofH. fuscogilvain the Philippines. The broodstock was collected on two occasions from Tubajon, Laguindingan, Misamis Oriental (May and June 2020). All broodstock survived with no evisceration in 30 min (27.835.2 deg C) of transport to the hatchery. Broodstock was induced to spawn using spawning techniques adopted from those of Agudo (2006) with modification in three events (July, August, and December 2020). However, successful spawning only occurred when the temperature was reduced by 7 deg C (extreme cold shock). H. fuscogilvaproduced 3.4 million eggs in three spawning inductions at 88% fertilization rate. The eggs hatched 23 d post-fertilization. Generally, the embryonic development of H. fuscogilva was radial holoblastic, and the larval development had the same pattern as other sea cucumber species. The auricularia stage was observed at Days 427, followed by the doliolaria stage at Days 2832, and pentactula stage at 3339 d post-fertilization. An average of 1.1% of the fertilized eggs proceeded to the juvenile stage at 4045 d post-fertilization. Over 4 mo, juveniles grew at 0.03 ± 0.002 g d1. This is the first documentation of the larval development ofH. fuscogilva and the first production of the juvenile stage in the Philippines, where 15,000 juveniles are being grown in the hatchery for future broodstock.
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