Diet analysis of dasy atid stingrays (order rajiformes; family dasyatidae) in the waters off Kota kinabalu, Sabah

Lim, Shung Ze (2008) Diet analysis of dasy atid stingrays (order rajiformes; family dasyatidae) in the waters off Kota kinabalu, Sabah. Universiti Malaysia Sabah. (Unpublished)


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This study examined the diet of dasyatid stingrays from the waters off Kota Kinabalu (that is including the water of Sepanggar Bay, Gantian Bay, Likas Bay and Gaya Bay). Specimens caught were firstly identified and their important food items (shown as an index of relative importance, IRI) and dietary type were investigated from analysis of the stomach contents. Four sampling stations were selected and the sampling period was 8 month (July 2007 to January 2008). Specimens were caught using passive fishing gears (three-layered gillnet, handline and bottom set long-line), while specimens were also obtained from artisanal fishermen fishing in the area. All specimens were either dissected within 3 hours after being caught, or frozen (-20° e) first. To analyse the diet, the stomach of each specimen was dissected. In total, 30 specimens from 5 species were caught, or obtained from fishermen during the study period. The species are Dasyatis kuhlii named commonly bluespotted stingray (nj=14), Himantura walga named commonly dwarf whipray (nj=8), Himantura gerrardi named commonly whitespotted whipray (nj=6), Himantura pastinacoides named commonly round whipray (nj=l) and Taeniura lymma named commonly blue spotted ribbon tail ray (nj=l). All the stomach of specimens was dissected to study their stomach content. However, only species that had more than one individual were analysed for their IRI of food item and type of diet. The hypothesis of dasyatids partitioning and competing living marine resource is supported by the observation of the similarities of important food and habitat between the 3 species.

Item Type: Academic Exercise
Uncontrolled Keywords: Dasyatidae, kota Kinabalu, Sabah
Subjects: Q Science > Q Science (General)
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 13 May 2013 04:41
Last Modified: 13 Oct 2017 09:00

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