Age, growth, and reproduction of silky sharks, Carcharhinus falciformis, in northeastern Taiwan waters

Joung, Shoou‐Jeng; Chen, Che‐Tsung; Lee, Hsian-Hau; Liu, Kwang‐Ming

doi:10.1016/j.fishres.2007.09.025

Cited by 57 publications

(74 citation statements)

References 18 publications

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“…1). Age at length information was derived from Joung et al (2008). Landing stage and release condition information was recorded for each shark (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Post-release survival of juvenile silky sharks captured in a tropical tuna purse seine fishery

Hutchinson¹,

Itano²,

Muir³

et al. 2015

Mar. Ecol. Prog. Ser.

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Juvenile silky sharks Carcharhinus falciformis comprise the largest component of the incidental elasmobranch catch taken in tropical tuna purse seine fisheries. During a chartered cruise on board a tuna purse seine vessel conducting typical fishing operations we investigated the post-release survival and rates of interaction with fishing gear of incidentally captured silky sharks using a combination of satellite linked pop-up tags and blood chemistry analysis. To identify trends in survival probability and the point in the fishing interaction when sharks sustain the injuries that lead to mortality, sharks were sampled during every stage of the fishing procedure. The total mortality rates of silky sharks captured in purse seine gear was found to exceed 84%. We found survival to precipitously decline once the silky sharks had been confined in the sack portion of the net just prior to loading. Additionally, shark interactions recorded by the scientists were markedly higher than those recorded by vessel officers and the fishery observer. Future efforts to reduce the impact of purse seine fishing on silky shark populations should be focused on avoidance or releasing sharks while they are still free swimming.

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“…1). Age at length information was derived from Joung et al (2008). Landing stage and release condition information was recorded for each shark (Table 1).…”

Section: Resultsmentioning

confidence: 99%

Post-release survival of juvenile silky sharks captured in a tropical tuna purse seine fishery

Hutchinson¹,

Itano²,

Muir³

et al. 2015

Mar. Ecol. Prog. Ser.

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“…Observations of these small freeswimming tiger sharks are a likely result of females aborting pups due to capture stress; a behaviour observed and recorded by contractors working with tiger sharks in the QSCP. Pup abortion is a post-capture stress response that has been reported previously in several other elasmobranch species (see Rincon, 2007, Joung et al, 2008, and may also explain the low mean litter size and the few extremely small free-swimming neonates observed in this study. Further, the range of sizes in a given litter may be considerable, with pups ranging from 66 -79.5 cm TL in one of the late-term litters analysed in this study.…”

Section: Reproductive Cyclesupporting

confidence: 82%

The biology and ecology of the tiger shark (Galeocerdo cuvier) on the east coast of Australia

Holmes¹

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The tiger shark (Galeocerdo cuvier) (Péron and Lesueur 1822) is the largest of the carcharhinids, with a circumglobal distribution in both tropical and warm temperate coastal and pelagic waters. In the western Pacific, G. cuvier movements are wide-ranging, encompassing the east coast of Australia and south Pacific Islands.Throughout the region, G. cuvier is exposed to a range of commercial, recreational, artisanal and illegal foreign fishery impacts, as both a target and by-product species.Listed as 'near threatened' on the International Union for Conservation of Nature (IUCN) Red List, suitable long term species-specific catch, catch rate and biological data are seldom available for large shark species like G. cuvier, particularly where historical commercial fishery logbook reporting has been poor.Shark control programs targeting large sharks along Australia's east coast have been in operation for over 60 years, using relatively standardised fishing gear in nearshore waters all year round, with historical catch and effort data recorded by shark contractors. Historical catch, catch rate and biological data collected through the Queensland Shark Control Program (QSCP) since 1993 were investigated, which revealed significant declines (p < 0.05) in catch rates of G. cuvier at some tropical and all sub-tropical locations along the Queensland coast. Significant temporal declines in the average size of G. cuvier also occurred at four of the nine locations analysed (p < 0.05), which could be indicative of fishing reducing abundance in these areas. Interannual variability in catches at each location was considerable and warranted careful interpretation with respect to estimating population abundance from these data.Investigation into the spatial and temporal movements of tiger sharks, and how their abundances fluctuate in relation to environmental influences, provided a basis for determining the factors driving this variability.Tiger shark movements were recorded using PAT Mk-10 and SPOT5 electronic tags to investigate G. cuvier spatial dynamics, site fidelity and habitat use off the east coast of Australia. Of the 18 tags deployed, 15 recorded information on depth and/or temperature, and horizontal movements, with tracking times ranging between four and 408 days. Horizontal movements were characterised by combinations of resident and transient behaviour that coincided with seasonal changes in water temperature, with summer migrations from sub-tropical Queensland waters to the southern temperate iii waters of New South Wales (NSW) to exploit the seasonally warm and prey abundant waters. While the majority of movement activity was focused around the continental slope, large-scale migration was evident with one individual moving from offshore Sydney, Australia, to New Caledonia (≈ 1800 km) in 48 days. Periods of tiger shark residency outside of Australia's fisheries management zones highlighted the potential vulnerability of the species to unregulated fisheries, and the importance of crossjurisdictional arrangemen...

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“…Nilai panjang asimtotik dari hasil penelitian ini lebih besar jika dibandingkan dengan hasil penelitian di wilayah perairan lainnya, kecuali di Perairan Taiwan (L  = 332 cmTL) (Joung et al, 2008). Meskipun demikian perbedaan panjang asimtotiknya tidak signifikan (kurang dari 1 cm).…”

Section: Bahasanunclassified

“…Kejadian yang hampir sama juga terjadi pada koefisien pertumbuhan, dimana nilainya (K = 0,42/th) lebih tinggi dibandingkan dengan yang terjadi di perairan lainnya seperti di Gulf of Mexico, Mexico (Branstetter, 1987), perairan Taiwan (Joung, et al, 2008), Baja California, Mexico (Sanchez, et al, 2010) dan di Samudera Pasifik (Oshitani, et al, 2003) (Tabel 1).…”

Section: Bahasanunclassified

PARAMETER POPULASI HIU KEJEN (Carcharhinus falciformis) DI PERAIRAN SELATAN NUSA TENGGARA BARAT

Chodrijah

Jatmiko²,

Sentosa³

2018

BAWAL Widya Riset Perikanan Tangkap

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ABSTRAKHiu kejen atau silky shark (Carcharhinus falciformis) merupakan salah satu spesies hiu dari famili Carcharhinidae yang banyak tertangkap di Samudera Hindia Selatan Jawa. Berdasarkan keputusan sidang CoP-17 di Johannesburg species ini masuk dalam daftar merah Apendik II CITES, sejak saat itu pengelolaan hiu kejen menjadi perhatian khusus pada perikanan tangkap. Tujuan penelitian ini adalah untuk mendapatkan informasi parameter populasi ikan hiu kejen di perairan Samudera Hindia bagian Selatan Nusa Tenggara. Penelitian dilakukan di Tempat Pendaratan Ikan Tanjungluar, Lombok Timur tahun 2016. Pengukuran contoh hiu meliputi panjang total tubuh, nisbah kelamin serta panjang klasper. Hasil penelitian terhadap 3002 ekor ikan contoh menunjukkan bahwa kisaran panjang total hiu kejen (Carcharhinus falciformis) antara 65-300 cm (betina) dan 74-315 cm (jantan). Rerata ukuran panjang total adalah 187,66 cm (betina) dan 195 cm (jantan). Parameter pertumbuhan menurut Von Bertalanffy, meliputi laju pertumbuhan (K), panjang asimptotik (L  ) dan umur ikan pada saat panjang ke-0 (t 0 ), masing-masing sebesar 0,42/tahun; 331,28 cmTL dan -0,20/ tahun. Persamaan kurva pertumbuhan von Bertalanffy untuk hiu kejen yaitu L t = 331,28 [1-e -0.,42(t+0.20) ]. Parameter mortalitas hiu kejen meliputi laju kematian total (Z), laju kematian alamiah (M) dan laju kematian karena penangkapan (F) masingmasing sebesar 2,79/tahun; 0,49/tahun dan 2,30/tahun. Laju eksploitasi (E) hiu kejen sebesar 0,82 menandakan eksploitasi terhadap spesies ini cenderung sudah tinggi. Kata Kunci: Carcharhinus falciformis; parameter populasi; Nusa Tenggara Barat ABSTRACT Silky shark (Carcharhinus falciformis) is one of the family Carcharhinidae that commonly caught in the Indian Ocean South of Java. The purpose of this study was to obtain information on the populations parameters of silky shark caught in the waters of Indian Ocean Southern part of Nusa Tenggara. The study was conducted at fish landing sites in Tanjungluar, East Lombok from January to December 2016. The method used in this research was survey method. Observations included total body length, sex ratio and clasper length measured with direct measurements and visual observations in the field. From a total 3002 fish samples showed that the total length range for silky shark (Carcharhinus falciformis) caught in the waters of the Indian Ocean landed inTanjungluar were between 65-300 cm TL (female) and , with the average length of 187, 66 cmTL (female) and 195 cm TL (male). The estimated Von Bertalanffy growth parameters of length infinity (L  ), growth rate (K) and theoretical age of fish at zero length (t 0 ) were 331.28 cmTL, respectively. The Von Bertalanffy growth equation for silky shark was ]. The calculated Parameters for silky shark mortality including total mortality rate (Z), the natural mortality rate (M)

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Age, growth, and reproduction of silky sharks, Carcharhinus falciformis, in northeastern Taiwan waters

Cited by 57 publications

References 18 publications

Post-release survival of juvenile silky sharks captured in a tropical tuna purse seine fishery

Post-release survival of juvenile silky sharks captured in a tropical tuna purse seine fishery

The biology and ecology of the tiger shark (Galeocerdo cuvier) on the east coast of Australia

PARAMETER POPULASI HIU KEJEN (Carcharhinus falciformis) DI PERAIRAN SELATAN NUSA TENGGARA BARAT

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