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Turkish Journal of Fisheries and Aquatic Sciences 2021, Vol 21, Num, 12     (Pages: 575-588)

Diversity, Length-Weight Relations, and Condition Factor of Sea Cucumbers in Three Coastal Areas Along the Southern Coast of Sri Lanka: A Case Study

Lalith Kumara Thiththagalle Gamage 1 ,Gajahin Gamage Nadeeka Thushari 2 ,Keerthi Sri Senevirathna Atapaththu 3 ,Rasika Sampath Kumara Hewa Kondaramage 1 ,Jayan Duminda Mahesh Senevirathna 2

1 University of Colombo, Institute for Agro-Technology and Rural Sciences, Weligatta-New Town, Hambantota, 82004, Sri Lanka
2 Uva Wellassa University, Faculty of Animal Science and Export Agriculture, Department of Animal Science, Passara Road, Badulla, 90000, Sri Lanka
3 University of Ruhuna, Faculty of Fisheries and Marine Sciences & Technology, Department of Limnology and Water Technology, Wellamadama, Matara, 81000, Sri Lanka
DOI : 10.4194/1303-2712-v21_12_01 Viewed : 531 - Downloaded : 708 Economically and ecologically important ecosystems that consist of diverse finfish and shellfish resources are found along the southern coast of Sri Lanka. Thus, the current study intends in assessing the species diversity, length-weight (L-W) relationships, and condition factor of sea cucumber stocks in selected coastal sites of southern Sri Lanka. The diversity of sea cucumber species was surveyed using the systematic sampling technique in three selected sites (Bandaramulla, Mirissa, and Weligama) during February-December 2019. The growth pattern of each species was identified using a least-squares regression model computed for length-weight relationships. Fulton`s condition factor (K) was analysed for each species. There were four common sea cucumber species (Holothuria atra - Lolly Fish, Bohadschia marmorata - White Thread fish, Actinipyga miliaris- Deep Water Blackfish, and Thelenota ananas- Prickly Redfish) in study sites, while Holothuria atra and Bohadschia marmorata were recorded as the most abundant species. The length-weight relationship derived for the above four species exhibited a negative allometric growth pattern (`b` < `3`), indicating faster length increment compared to weight. The habitat qualities of all sea cucumber species were in optimum environmental condition. Our findings would benefit as baseline data for implementing sustainable management practices of sea cucumber resources. Keywords : Holothuroidea, Length-Weight Relationship, Allometric Growth Pattern, Condition Factor, Fishery Management