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Galeus polli, African sawtail catshark : fisheries
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Galeus polli
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Elasmobranchii (sharks and rays) >
Carcharhiniformes
(Ground sharks) >
Pentanchidae
(Deepwater catsharks)
Etymology:
Galeus:
galeos
, a small shark or dogfish according to Aristotle and others. (
See ETYFish
)
;
polli:
In honor of Belgian ichthyologist Max Poll (1908-1991), who first brought attention to this species. (
See ETYFish
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; bathydemersal; depth range 200 - 720 m (Ref.
244
), usually 300 - 500 m (Ref.
9996
). Deep-water; 26°N - 26°S
Eastern Atlantic: southern Morocco to Namibia (Ref.
244
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
30.5
  range ? - ? cm
Max length : 45.0 cm TL male/unsexed; (Ref.
5578
)
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 0;
Anal
spines
: 0;
Anal
soft rays
: 0. A long-nosed, dwarf catshark with a narrow head, large eyes, and small labial furrows; upper caudal fin margin with prominent crest of enlarged sawtooth-like denticles (Ref.
5578
). Pale brown, paler ventrally; juveniles have dark saddles that become less prominent in adults (Ref.
5510
).
Found on the outermost shelf and upper slope. Feeds mainly on small bony fish, including lanternfish, hakes, grenadiers, rockfish and lightfish, also squid and crustaceans. Ovoviviparous (Ref.
50449
). Tolerates bottom with low oxygen levels (Ref.
5578
). Utilized fresh (Ref.
244
).
Eggs are sometimes fertilized internally by accident via close apposition of gonopores in otherwise oviparous fishes and may be retained within the female's body and complete some of the early stages of embryonic development. Embryos feed solely on yolk (Ref.
50449
). Bears up to 12 young (Ref.
5578
), size at birth 11-12 cm (Ref.
5510
).
Compagno, L.J.V.
, 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref.
244
)
IUCN Red List Status (Ref.
130435
)
Vulnerable (VU)
(A2d); Date assessed:
31 August 2020
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries: minor commercial
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Estimates based on models
Preferred temperature (Ref.
123201
): 6.7 - 11, mean 8.7 °C (based on 38 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00229 (0.00140 - 0.00375), b=3.06 (2.92 - 3.20), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245
).
Trophic level (Ref.
69278
): 4.2 ±0.7 se; based on diet studies.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Fec=12).
Fishing Vulnerability (Ref.
59153
): Low to moderate vulnerability (35 of 100).
Price category (Ref.
80766
):
Low
.
Nutrients (Ref.
124155
): Calcium = 10.4 [1.8, 67.5] mg/100g; Iron = 0.351 [0.075, 1.198] mg/100g; Protein = 17 [14, 20] %; Omega3 = 0.218 [0.089, 0.525] g/100g; Selenium = 6.92 [2.23, 20.67] μg/100g; VitaminA = 21.2 [4.5, 99.2] μg/100g; Zinc = 0.409 [0.190, 0.785] mg/100g (wet weight);
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