Pristiophorus nancyae, African dwarf sawshark : fisheries

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Pristiophorus nancyae Ebert & Cailliet, 2011

African dwarf sawshark
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Pristiophorus nancyae   AquaMaps   Data sources: GBIF OBIS
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板鰓亜鋼(サメとエイ類) (sharks and rays) > Pristiophoriformes (Saw sharks) > Pristiophoridae (Saw sharks)
Etymology: Pristiophorus: Greek, pristis = saw + Greek, pherein = to carry (Ref. 45335);  nancyae: The species name nancyae is in honor of Nancy Packard Burnett for her gracious support of chondrichthyan research at the Pacific Shark Research Center at Moss Landing Marine Laboratories (Ref. 87357)

Environment: milieu / climate zone / depth range / distribution range 生態学

; 海; 深さの範囲 286 - 570 m (Ref. 97326), usually - m (Ref. ).   Tropical; 0°C -

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | Faunafri

Western Indian Ocean: central and southern Mozambique (Ref. 87357). Off Kenya and Yemen (Socotra Islands) (Ref. 97326). Records from off Somalia and the Arabian Sea off Pakistan appear to be a different, possibly undescribed, species (Ref. 87357).

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - 57 cm
Max length : 61.6 cm TL オス/雌雄の選別がない; (Ref. 97326); 62.1 cm TL (female)

簡単な記述 形態学 | 形態計測学

脊つい: 132 - 139. Diagnosis: A small five-gilled sawshark distinguished from its congeners by having the following characteristics: the presence of two rows of enlarged pre-barbel pits on the rostral ventral surface; rostral barbels closer to mouth than snout tip; base of large rostral teeth with ridges; eyes very large, oval-shaped, emerald green in life; first dorsal fin broadly triangular, with rear tip extending behind pelvic fin midbases; lateral trunk denticles imbricated; colouration in life brownish gray laterally, becoming lighter ventrally; fin margins lighter along posterior edges; dorsal rostrum surface with two distinct longitudinal dark stripes; lateral rostral teeth dark-edged (Ref. 87357).

生物学     用語集 (例 epibenthic)

This species is a poorly known inhabitant of the upper continental slope in tropical waters found at depths of 286-500 m (Ref. 87357). Stomach contents include an unidentified organic material, partially digested shrimplike crustaceans, and small decapod shrimps; no fish or cephalopod remains were found (Ref. 87357). Larger individuals had small puncture marks and elongated parallel cuts on their backs and tails suggestive of combat injuries from the rostra of other sawsharks (Ref. 87357). Unknown litter size; it may be caught and discarded as bycatch by offshore shrimp trawlers and other deepwater fisheries operations off Mozambique (Ref. 87357).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | | 生産力 | 幼生

主な参考文献 Upload your references | 参考文献 | コーディネーター : Compagno, Leonard J.V. | 協力者

Ebert, D.A and G.M. Cailliet, 2011. Pristiophorus nancyae, a new species of sawshark (Chondrichthyes: Pristiophoridae) from Southern Africa. Bull. Mar. Sci. 87(3):501-512. (Ref. 87357)

IUCNのレッドリストの状況は (Ref. 124695)

  軽度懸念 (LC) ; Date assessed: 24 April 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

水産業:
FAO - Publication: search | FishSource |

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Estimates based on models

Preferred temperature (Ref. 115969): 9.8 - 12.4, mean 11.4 °C (based on 18 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5156   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.8   ±0.6 se; based on size and trophs of closest relatives
回復力
弱み (Ref. 59153):  Low to moderate vulnerability (29 of 100) .