Some Biological Aspects and Rearing of Ragged Sea Hare (Bursatella leachii de Blainville, 1817) in the Hatchery

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ragged sea hare Bursatella leachii aquaculture

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Wasana Arkronrat
Klongwan Fillheries Research Station, Academic Support Division, Faculty of fisheries, Kasetsart University, Thailand
Vutthichai Oniam
Klongwan Fillheries Research Station, Academic Support Division, Faculty of fisheries, Kasetsart University, Thailand
Nurul Najuatul Wahidah Binti Khalid
Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, Malaysia
Norhasmariza Binti Mohamed
Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, Malaysia

Abstract

Samples of the ragged sea hare, Bursatella leachii, were collected in the marine shrimp ponds during December 2014-January 2015 to study some biological aspects (spawning and egg development) and condition factors (feedstock, substrates and stocking density) on reared B. leachii. The results showed that under hatchery conditions (salinity 32 ppt, water temperature 28.5-29.1°C, DO 4.19-5.11 mg/L and pH 8.14-8.32), B. leachii adults were clustered together in groups of 3-5 individuals for spawning. Egg development from brownish to dark brown took 6-7 days until newly hatched veligers (larval stage 1) were produced. The results of the condition factors experiment showed that the mean body weight of B. leachii fed with seaweeds (Caulerpa sp.) and mixed feeds (50% seaweeds, fresh weight and 50% shrimp feed No. 2, pellet size about 0.8-1 mm) increased, whereas it decreased when B. leachii was fed with shrimp feed No. 2. Rearing without or with sand substrate increased the growth of ragged sea hare, but having a clay substrate adversely affected growth. The growth and survival rates of B. leachii reared at stocking densities of 5, 10 and 15 sea hares/100 L (or about 2.5, 5.0 and 7.5 kg sea hares/m3, respectively) were not significant different. This study recommends that B. leachii can be reared and spawned in a hatchery, with feedstock and substrates affecting growth, whereas stocking density not affecting growth and survival.

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Arkronrat, W., Oniam, V., Khalid, N. N. W. B., & Mohamed, N. B. (2016). Some Biological Aspects and Rearing of Ragged Sea Hare (Bursatella leachii de Blainville, 1817) in the Hatchery. Journal of Fisheries and Environment, 40(2), 79–87. Retrieved from https://li01.tci-thaijo.org/index.php/JFE/article/view/81247
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Vol. 40 No. 2 (2016): May-August
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Articles

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