An annotated checklist of the chondrichthyans of Papua New Guinea

White, William T.; Ko’Ou, Alfred

doi:10.11646/zootaxa.4411.1.1

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…Comparatively, only 20% of interviewees reported declines in other ‘sharks’ (all species as a general grouping), which may indicate disproportionate declines in sawfish. There is a wide diversity of sharks in PNG (White & Ko’ou, 2018) and differences in resilience between shark species (Cortés, 2002) may mask species‐specific declines within this broader ‘shark’ grouping.…”

Section: Discussionmentioning

confidence: 99%

“…Gathering information on sawfish and relevant small‐scale fisheries in southern PNG, however, presents many logistical challenges and knowledge gaps. The remoteness and inaccessibility of southern PNG has limited the amount of research that has been conducted, particularly on elasmobranch species (White & Ko'ou, 2018), while studies documenting small‐scale fishery characteristics are restricted to the South Fly Coast (e.g. Busilacchi et al, 2014; Busilacchi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Local knowledge surveys with small‐scale fishers indicate challenges to sawfish conservation in southern Papua New Guinea

Grant

White

Amepou

et al. 2021

Aquatic Conservation

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Sawfish (Pristidae) are considered to be among the most threatened families of elasmobranch (sharks and rays). There is a need to gather information on the status of poorly known sawfish populations to assist in global recovery initiatives. This study used interviews with local fishers to investigate the presence of sawfish in southern Papua New Guinea (PNG) and their interactions with and uses and values for small‐scale fishers. A range of sawfish size classes are still encountered throughout southern PNG, while juvenile largetooth sawfish Pristis pristis were additionally reported in the freshwater reaches of all rivers surveyed. Reports of large size classes in estuarine and marine environments provide an optimistic outlook that sawfish populations persist throughout southern PNG. Most fishers that catch sawfish retain them for various uses including consumption and for the sale of meat, fins and occasionally rostra. Negative population trends including decreases in catch frequency and/or size classes were reported by 66% of interviewees, with the largest declines being reported in the Kikori River. The increasing technical capacity of small‐scale fishers, their preference for gillnetting and the emerging market for teleost swim bladder (a high‐value fishery product) present a major ongoing threat to sawfish in southern PNG. Furthermore, the tendency of fishers to kill or remove rostra from entangled sawfish results in high fishing mortality regardless of any use by the fisher. This study indicates that considerable community engagement will be necessary to manifest any legislative actions or increased enforcement on international trade regulations for sawfish in PNG. This is due to traditional land and waterway ownership values throughout PNG and the local perception of sawfish as a traditional food resource rather than an animal of intrinsic biodiversity value as perceived by global conservationists. Future research should consider exploring culturally appropriate conservation initiatives that are likely to achieve engagement and participation from local fishers.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local knowledge surveys with small‐scale fishers indicate challenges to sawfish conservation in southern Papua New Guinea

Grant

White

Amepou

et al. 2021

Aquatic Conservation

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“…Monospondylous centra, 47 (45)(46)(47); n = 5); diplospondylous precaudal centra, 49 (48-54; n = 5); diplospondylous caudal centra, 44 (36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48); n = 5); total precaudal centra, 96 (95-101; n = 5); total centra, 140 (133-143; n = 5).…”

Section: Descriptionunclassified

“…albimarginatus. These two specimens differ in numerous morphological features (see in the Remarks section for D. albimarginatus above), leading to the juvenile specimen being considered a distinct species [37,38]. However, since the intraspecific variation is poorly known in Dichichthys, it is tentatively assigned to D. cf.…”

Section: Intraspecific Variationmentioning

confidence: 99%

Dichichthyidae, a New Family of Deepwater Sharks (Carcharhiniformes) from the Indo–West Pacific, with Description of a New Species

White,

Stewart,

O’Neill

et al. 2024

Fishes

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The genus Dichichthys was resurrected for five species previously allocated to the genus Parmaturus in the family Pentanchidae. Supraorbital crests on the chondrocranium distinguish Dichichthys from Parmaturus and other members of the family Pentanchidae. A new family, Dichichthyidae, has been proposed to contain Dichichthys. The sequence of the NADH2 mitochondrial gene confirms the placement of Dichichthys outside of the Pentanchidae family, as well as separate from the Atelomycteridae and Scyliorhinidae families. Dichichthys albimarginatus was described using a holotype collected off the coast of New Caledonia. A second juvenile specimen collected off the coast of Papua New Guinea was tentatively assigned as D. cf. albimarginatus. Dichichthys bigus is known from the holotype collected in the Coral Sea off the coast of Queensland, Australia. A new, parasite-afflicted underwater observation was reported further north of Queensland. The type species Dichichthys melanobranchus, previously only known from juvenile specimens, was redescribed based on adult specimens. Dichichthys nigripalatum is known from the holotype collected off Sumbawa, Indonesia, and a tentatively identified photo record from West Java. Dichichthys satoi n. sp. is described from the West Norfolk Ridge and off the North Island of New Zealand. Members of the genus Dichichthys have unique curved egg cases which have pliable ridges made up of numerous fibres and long coiled tendrils on the posterior end.

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Redescription of the longnose houndshark Iago garricki (Carcharhiniformes: Triakidae), based on specimens recently collected from the South China Sea

Liu

et al. 2022

Zootaxa

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The longnose houndshark, Iago garricki Fourmanoir & Rivaton 1979, was described based on five specimens collected from Vanuatu. Five additional specimens were recently collected from the waters off Dongsha Atoll, South China Sea. A redescription of this species is provided based on the holotype, non-types collected near the type locality and off Dongsha Atoll. The species is characterized by eye length larger than gill slit height; first dorsal-fin origin not reaching a vertical line through pectoral-fin base; head length 20.2–22.2% TL; preoral length 7.2–8.3% TL; upper labial furrow 2.2–3.4% TL; lateral teeth with 1–3 small cusplets on lateral side basally; diplospondylous centra 53–61; precaudal centra 94–102; and total centra 149–157. The specimens collected from the South China Sea represent the northernmost distributional record of this species.

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An annotated checklist of the chondrichthyans of Papua New Guinea

Cited by 4 publications

References 19 publications

Local knowledge surveys with small‐scale fishers indicate challenges to sawfish conservation in southern Papua New Guinea

Local knowledge surveys with small‐scale fishers indicate challenges to sawfish conservation in southern Papua New Guinea

Dichichthyidae, a New Family of Deepwater Sharks (Carcharhiniformes) from the Indo–West Pacific, with Description of a New Species

Redescription of the longnose houndshark Iago garricki (Carcharhiniformes: Triakidae), based on specimens recently collected from the South China Sea

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