Data on the bycatch fishery and reproductive biology of mobulid rays (Myliobatiformes) in Indonesia

White, William T.; Giles, Jenny; Dharmadi,; Potter, I. C.

doi:10.1016/j.fishres.2006.08.008

Cited by 123 publications

(167 citation statements)

References 7 publications

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“…All acoustically tagged individuals traveled frequently among high-use receiver locations and reefs and demonstrated fidelity to specific sites 1 3 often used in shark fin soup (Shen et al 2001;Alava et al 2002). Demand for gill rakers and fin meat drive directed manta ray fisheries throughout much of their range (Alava et al 2002;Dewar 2002;White et al 2006). There are also more cryptic threats to mantas including mooring and fishing line entanglement (Bigelow and Schroeder 1953;Deakos et al 2011), boat strikes (Deakos 2010), and pressure from ecotourism operations (Dewar et al 2008;Couturier et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…However, despite the presence of significant directed fishing effort and a susceptibility to human exploitation, we lack basic ecological information on life history parameters, movements, and habitat use of mantas (Couturier et al 2012;Walter et al 2013). This knowledge gap represents a significant impediment to the development of conservation and management strategies for mobulid rays (White et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Movements of the reef manta ray (Manta alfredi) in the Red Sea using satellite and acoustic telemetry

Braun

Skomal²,

Thorrold

et al. 2015

Mar Biol

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within the array. Estimated and realized satellite tag data indicated regional movements <200 km from the tagging location, largely coastal residency, and high surface occupation. GPS-tagged individuals regularly moved within the coastal reef matrix up to ~70 km to the south but continued to return to the tagging area near the high-occupancy sites identified in the acoustic array. We also tested the accuracy of several geolocation models to determine the best approach to analyze our light-based satellite tag data. We documented significant errors in light-based movement estimates that should be considered when interpreting tracks derived from light-level geolocation, especially for animals with restricted movements through a homogenous temperature field. Despite some error in satellite tag positions, combining results from PSAT and acoustic tags in this study yielded a comprehensive representation of manta spatial ecology across several scales, and such approaches will, in the future, inform the design of appropriate management strategies for manta rays in the Red Sea and tropical regions worldwide.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Movements of the reef manta ray (Manta alfredi) in the Red Sea using satellite and acoustic telemetry

Braun

Skomal²,

Thorrold

et al. 2015

Mar Biol

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“…Komposisi hasil tangkapan ikan termasuk famili Mobulidae dari perairan Samudera Hindia didominasi oleh M. japanica (50%), kemudian diikuti oleh M. tarapacana (24%), Manta birostris (14%), M. thurstoni (9%) dan M. cf kuhlii (2%) (White et al, 2006a). Produksi ikan pari famili Mobulidae (Mobula sp.…”

Section: Pendahuluanunclassified

PERIKANANDANASPEKBIOLOGI IKANPARI LAMPENGAN, Mobula japanica DI PERAIRANSELATAN JAWA

Dharmadi

Sunarno

Edrus

2017

BAWAL Widya Riset Perikanan Tangkap

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ABSTRAKIkan pari merupakan salah satu jenis ikan yang banyak didaratkan berasal dari Selatan Jawa. Salah satu jenis ikan pari yang belum banyak dilakukan penelitian adalah ikan pari lampengan (Mobula japanica). Tujuan penelitian ini adalah untuk mengetahui tentang perikanan dan aspek biologi jenis ikan tersebut di perairan Selatan Jawa sebagai informasi dasar bagi penentuan kebijakan pengelolaan perikanan Elasmobranchii. Penelitian menggunakan metode survei yang berlangsung dari Januari hingga Desember 2010 di Pelabuhan Perikanan Samudera Cilacap-Jawa Tengah. Sejumlah 165 ikan pari yang tertangkap oleh jaring insang diamati tingkat kematangan seksual, tingkat kematangan gonad, jenis kelamin dan ukuran lebar cawannya. Wawancara dilakukan terhadap para nelayan dan nahkoda kapal yang menangkap ikan pari lampengen tersebut secara langsung dan atau oleh enumerator. Hasil penelitian menunjukkan bahwa tangkapan per satuan usaha (CPUE) ikan pari lampengan bervariasi, yakni tertinggi pada bulan Juli (22,6 kg/ hari) dan terendah pada bulan Oktober (6,6 kg/hari). Frekuensi lebar tubuh ikan pari lempengen terendah terdapat pada ukuran antara 100-140 cm dengan modus 120 cm yang termasuk kelompok muda, sedangkan ukuran antara 150-200 cm dengan modus 170 cm, termasuk kelompok dewasa. Frekuensi lebar tubuh tertinggi terdapat pada ukuran antara 200-260 cm dengan modus 230 cm. Ikan pari lempengen sedikitnya terdiri atas 3 kelompok umur dengan modus sebaran lebar tubuh masing-masing 120, 170, dan 230 cm. Hubungan lebar tubuh (y) dan panjang klasper (x) mengikuti persamaan y=0,3784e 0,0131x (r 2 =0,85), semakin bertambah lebar tubuh semakin bertambah panjang klaspernya. Perbandingan kelamin jantan dan betina adalah tidak seimbang (1,5:1). Sebagian besar kelompok umur ikan pari lampengan yang tertangkap tergolong usia muda, yang belum mencapai pertumbuhan optimum (growth over fishing).KATA KUNCI: perikanan, aspek biologi, ikan pari lampengan, Mobula japanica, Selatan Jawa, ABTRACT:Fisheries and biological aspects of Stingray, Mobula japanica caught from South of Java, By: Dharmadi, Mas Tri Djoko Sunarno, and Isa Nagib Edrus Stingray is one of the species of fish that many landed came from the South of Java. One of the species that have not many research is Japanese Devilray (Mobula japanica). The purpose of this study was to determine fisheries and biological aspects of Japanese Devilray, Mobula japanica in Indian Ocean as basic information for managing the elasmobranches fisheries. This study was conducted from January to December 2010 in the Ocean

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“…Therefore, some high valued species are already threatened before any management responses could be put into place (Camhi ef a/., 1998 (Simpfendorfer, 1992;Liu ef a/., 1999). Knowing size at first maturity is essentiai that allows us to examine mature and spawning stocks for managing the species exploitation (Jennings el a/., 1998 (White & Dharmadi, 2007) (Howell, 1997;Zar,1999 White et al, 2006a;White & Dharmadi, 200V White et al, 2002). The examination of female reproduction was conducted only when the species was being processed in the market and embryos were counted if existing.…”

Section: Introductionmentioning

confidence: 99%

“…Size at first maturity of males was assessed by plotting clasper length against body size (total iength or disc width), according to the calcification of the claspers. Whilst the 50% of males attain maturity {the DWuo at maturity)was derived from a logistic regression (White et al.2006a), where the proportion (Pow) of those rays that were mature at size disc width was (White & Dharmadi,2007) was about similar to those recorded from the west and east north Java, south Java, Malacca, and east Sumatera regions, whiles size range of Neotrygon kuhlii(Bali form) was about similar to those recorded in south Natuna.…”

Section: Introductionmentioning

confidence: 99%

SIZE AT FIRST MATURITY OF THE BLUE SPOTTED MASKRAY, Neotrygon kuhli lN INDONESIAN, WATERS

Fahmi

Adrim

Dharmadi³

2017

Indonesian Fisheries Research Journal

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The biue spotted maskray, Neotrygon kuhtii is the most common rays occurred in Indonesian waters. This species is often caught as bycatch in trawl fisheries targeting demersal fishes and shrimps. The unselected ancl intensive catches of this species can influence to its sustainable in the future. A study on this species was conducted at several areas in Indonesia from 2003 to 2006. A total of 1,122 individuals, consisting of 523 females and 599 males were measured from some areas in western lndorresia including the Java Sea, the Malacca Strait, South Java, East Sumatera, West Kalimantan, and South Natuna waters. Size ranges o'f Neotrygon kuhlii were varied among regions.In general, mature individuals were caught more often than neonates in all areas. The minimtlm size was 130 mm disc width and maximum size was 415 mm disc width. Females usually produce one pup in its reproduction cycle and the smallest recorded pregnant female was 240 mm disc width, while the largest was 317 mm disc width. Males attain maturity at size between 215 and 295 mm disc width. There were also differences in size at first maturity lor Neotrygon kultlii caught from each area.The rays seemed to be mature earlier at the Java Sea, West Kalimantan, East Sumatera and the Malacca Strait, as an indication of the plasticity in their life histories to cope with fishing pressure and environmental degradations in their habitats.

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Data on the bycatch fishery and reproductive biology of mobulid rays (Myliobatiformes) in Indonesia

Cited by 123 publications

References 7 publications

Movements of the reef manta ray (Manta alfredi) in the Red Sea using satellite and acoustic telemetry

Movements of the reef manta ray (Manta alfredi) in the Red Sea using satellite and acoustic telemetry

PERIKANANDANASPEKBIOLOGI IKANPARI LAMPENGAN, Mobula japanica DI PERAIRANSELATAN JAWA

SIZE AT FIRST MATURITY OF THE BLUE SPOTTED MASKRAY, Neotrygon kuhli lN INDONESIAN, WATERS

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