Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah

This study examined the biodiversity and ecology (in the fields of species distribution, length-weight relationship, fecundity and diet) of elasmobranchs (sharks and batoids) in the waters off northeastern Sabah (included the waters off east Kudat Division and Sandakan Division). Samplings were car...

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Main Author:	Lim, Shung Zer
Format:	Thesis
Language:	English
Published:	2011
Subjects:	SH Aquaculture Fisheries Angling
Online Access:	https://eprints.ums.edu.my/id/eprint/7531/1/mt0000000250.pdf
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id	my-ums-ep.7531
record_format	uketd_dc
spelling	my-ums-ep.75312017-10-12T02:51:31Z Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah 2011 Lim, Shung Zer SH Aquaculture. Fisheries. Angling This study examined the biodiversity and ecology (in the fields of species distribution, length-weight relationship, fecundity and diet) of elasmobranchs (sharks and batoids) in the waters off northeastern Sabah (included the waters off east Kudat Division and Sandakan Division). Samplings were carried out from April 2009 to March 2010 on-board a commercial trawler operating in the study area. Overall, 340 specimens of elasmobranchs were collected and identified as belonging to 22 species (10 shark species and 12 batoid species). The distribution of species was known based on the locations of specimens caught. These locations were divided to seven zones, in which the position of these seven zones was distinguished to north (zone 1 and 2), centre (zone 3, 4 and 5) and south (zone 6 and 7) of study area. The species was supposed as either abundant or rare species in the study area. The different elasmobranch species were caught with different catch per unit effort (CPU E) at different locations, such as Himantura gerrardi was caught with high CPUE at the north and centre, Neotrygon kuhlii and Dasyatis zugei were caught with high CPUE at the south, Narcine prodorsalis and Narcine timlei restrictedly at the north of study area were caught with high CPUE at there, and so on. The five most abundant species (H gerrardi, 28.2%; N. kuhlii, 12.9%; Rhizoprionodon acutus, 11.8%; D zugei, 9.4% and Sphyrna lewini, 6.2%) owned more than 20 individual species to meet the criteria of analysing length-weight relationship. All these five species exhibited positive allometric growth. Only two species (N. kuhlii and D zugel) were caught with pregnant female to investigate fecundity. The fecundity of N. kuhlii is one pup and that of D. zugei is one to two pups. The stomach contents of 14 species were analysed by using the quantitative diet analysis method to find out their main diet. It was found out that the species from the same family preyed on the same important food items. The marine resources partitioned by different elasmobranch species in the study area were overviewed as shrimp resource which was mostly taken by four dasyatid stingrays (H gerrardi, Himantura uamacoides, N. kuhlii and D. zugel) and two hemiscylliid sharks (Chiloscyllium plagiosum and Chiloscyllium punctatum). Fish resource was mostly taken by three carcharhinid sharks (Carcharhinus dussumieri, carcharhinus sorrah and R. acutus), a scyliorhinid shark (Atelomycterus marmoratus) and a sphyrnid shark (S. lewim). Octopus resource was mostly taken by a hemigaleid shark (Hemigaleus microstoma), and polychaeta resource was mostly taken by two narcinid electric rays (N. prodorsalis and N. timlei). 2011 Thesis https://eprints.ums.edu.my/id/eprint/7531/ https://eprints.ums.edu.my/id/eprint/7531/1/mt0000000250.pdf text en public masters Universiti Malaysia Sabah Borneo Marine Research Institute
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English
topic	SH Aquaculture Fisheries Angling
spellingShingle	SH Aquaculture Fisheries Angling Lim, Shung Zer Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah
description	This study examined the biodiversity and ecology (in the fields of species distribution, length-weight relationship, fecundity and diet) of elasmobranchs (sharks and batoids) in the waters off northeastern Sabah (included the waters off east Kudat Division and Sandakan Division). Samplings were carried out from April 2009 to March 2010 on-board a commercial trawler operating in the study area. Overall, 340 specimens of elasmobranchs were collected and identified as belonging to 22 species (10 shark species and 12 batoid species). The distribution of species was known based on the locations of specimens caught. These locations were divided to seven zones, in which the position of these seven zones was distinguished to north (zone 1 and 2), centre (zone 3, 4 and 5) and south (zone 6 and 7) of study area. The species was supposed as either abundant or rare species in the study area. The different elasmobranch species were caught with different catch per unit effort (CPU E) at different locations, such as Himantura gerrardi was caught with high CPUE at the north and centre, Neotrygon kuhlii and Dasyatis zugei were caught with high CPUE at the south, Narcine prodorsalis and Narcine timlei restrictedly at the north of study area were caught with high CPUE at there, and so on. The five most abundant species (H gerrardi, 28.2%; N. kuhlii, 12.9%; Rhizoprionodon acutus, 11.8%; D zugei, 9.4% and Sphyrna lewini, 6.2%) owned more than 20 individual species to meet the criteria of analysing length-weight relationship. All these five species exhibited positive allometric growth. Only two species (N. kuhlii and D zugel) were caught with pregnant female to investigate fecundity. The fecundity of N. kuhlii is one pup and that of D. zugei is one to two pups. The stomach contents of 14 species were analysed by using the quantitative diet analysis method to find out their main diet. It was found out that the species from the same family preyed on the same important food items. The marine resources partitioned by different elasmobranch species in the study area were overviewed as shrimp resource which was mostly taken by four dasyatid stingrays (H gerrardi, Himantura uamacoides, N. kuhlii and D. zugel) and two hemiscylliid sharks (Chiloscyllium plagiosum and Chiloscyllium punctatum). Fish resource was mostly taken by three carcharhinid sharks (Carcharhinus dussumieri, carcharhinus sorrah and R. acutus), a scyliorhinid shark (Atelomycterus marmoratus) and a sphyrnid shark (S. lewim). Octopus resource was mostly taken by a hemigaleid shark (Hemigaleus microstoma), and polychaeta resource was mostly taken by two narcinid electric rays (N. prodorsalis and N. timlei).
format	Thesis
qualification_level	Master's degree
author	Lim, Shung Zer
author_facet	Lim, Shung Zer
author_sort	Lim, Shung Zer
title	Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah
title_short	Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah
title_full	Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah
title_fullStr	Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah
title_full_unstemmed	Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah
title_sort	biodiversity and ecology of elasmobranchs in the waters off northeastern sabah
granting_institution	Universiti Malaysia Sabah
granting_department	Borneo Marine Research Institute
publishDate	2011
url	https://eprints.ums.edu.my/id/eprint/7531/1/mt0000000250.pdf
_version_	1747836348427927552

Biodiversity and ecology of elasmobranchs in the waters off northeastern Sabah

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