Chrysoblephus gibbiceps

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Chrysoblephus gibbiceps
Chrysoblephus gibbiceps1.jpg
Chrysoblephus gibbiceps P4110448.JPG
Old (above), young (below)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Acanthuriformes
Family: Sparidae
Genus: Chrysoblephus
Species:
C. gibbiceps
Binomial name
Chrysoblephus gibbiceps
(Valenciennes, 1830)
Synonyms [2]
  • Chrysophrys gibbicepsValenciennes, 1830

Chrysoblephus gibbiceps, the red stumpnose, red stumpnose seabream or Miss Lucy, is a species of marine ray-finned fish belonging to the family Sparidae, the seabreams and porgies. This fish is endemic to the southwestern Indian Ocean off the coast of South Africa. The International Union for Conservation of Nature classifies this species as Endangered.

Contents

Taxonomy

Chrysoblephus gibbiceps was first formally described in 1830 as Chrysophrys gibbiceps by the French zoologist Achille Valenciennes with its type localitygiven as the Cape of Good Hope in South Africa. [3] In 1839 William Swainson classified Valenciennes' C. gibbericeps in a new subgenus of Chrysophrys he called Chrysoblephus and named it as its only species, making this species the type species of Chrysoblephus by monotypy. [4] The genus Chrysoblephus is placed in the family Sparidae within the order Spariformes by the 5th edition of Fishes of the World . [5] Some authorities classify this genus in the subfamily Sparinae, [6] but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae. [5]

Etymology

Chrysoblephus gibbiceps has the specific name gibbiceps, which is a combination of gibbus, meaning "hump", with ceps. which means "head". This is a reference to the bulbous forehead in adult males of this species. [7]

Description

Chrysoblephus gibbiceps has a deep and compressed body, its standard length is between 2 and 2.4 times its depth. The dorsal fin is supported by 11 or 12 spines and 10 or 11 soft rays while the anal fin contains 3 spines and between 7 and 9 soft rays. The dorsal profile of the head is very steep between the snout and the nostrils. As they grow, a bulge develops in the area between the eyes and in large adults there is a large hump on the nape, creating a protruding forehead. It has a reddish orange body with golden flecks, slightly lighter in colour ventrally, with between 5 and 7 indistinct vertical red bars and a lot of irregularly shaped dark spots on the upper body. [8] The red stumpnose seabream has a maximum published total length of 75 cm (30 in), although 50 cm (20 in) is more typical. [2]

Distribution and habitat

Chrysoblephus gibbiceps is found in the extreme south eastern Atlantic and the southwestern Indian Ocean off the southern coasts of South Africa between False Bay and East London, with records as far north as Margate, South Africa, although these may be misidentifications of similar species such as C. anglicus . [1] This species occurs in coastal waters at depths between 10 and 100 m (33 and 328 ft). [8] The adults are found on offshore reefs while the juveniles shoal over rocky reefs in shallow water. [1]

Biology

Chrysoblephus gibbiceps, unlike some of its congeners, appears to be gonochoristic, not hermaphroditic. They spawn from October to January, peaking in December at the Agulhas Bank. [1] Males have a very low gonadosomatic index (GSI) of 1.6% and this suggests that they are polygamous and that they compete with other males for access to females. [9] It is a predator on benthic organisms and it has been recorded feeding on crustaceans, molluscs and small fishes, [8] although its main prey are brittle stars. [9] Adults are territorial, but will aggregate to spawn, when they come inshore. [10] The monogenean Anoplodiscus cirrusspiralis is an ectoparasite of this species. [2]

Fisheries and conservation

Chrysoblephus gibbiceps is regarded as a highly palatable food fish. [8] It has been targeted by commercial fisheries on the Agulhas Bank [1] and in False Bay. [8] It is also pursued by recreational anglers. Bag and size limits have been imposed, [1] but the stock has been described as having collapsed due to overfishing. [9] The IUCN classifies this fish as Endangered. [1]

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References

  1. 1 2 3 4 5 6 7 Mann, B.Q.; Buxton C.D.; Pollard, D. & Carpenter, K.E. (2014). "Chrysoblephus gibbiceps". IUCN Red List of Threatened Species . 2014: e.T170256A1302981. doi: 10.2305/IUCN.UK.2014-3.RLTS.T170256A1302981.en . Retrieved 9 January 2024.
  2. 1 2 3 Froese, Rainer; Pauly, Daniel (eds.). "Chrysoblephus gibbiceps". FishBase . October 2023 version.
  3. ↑ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Chrysoblephus". Catalog of Fishes . California Academy of Sciences . Retrieved 9 January 2024.
  4. ↑ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Genera in the family Sparidae". Catalog of Fishes . California Academy of Sciences . Retrieved 9 January 2024.
  5. 1 2 Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 502–506. doi:10.1002/9781119174844. ISBN   978-1-118-34233-6. LCCN   2015037522. OCLC   951899884. OL   25909650M.
  6. ↑ Parenti, P. (2019). "An annotated checklist of the fishes of the family Sparidae". FishTaxa. 4 (2): 47–98.
  7. ↑ "Order SPARIFORMES: Families LETHRINIDAE, NEMIPTERIDAE and SPARIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf. 22 December 2023. Archived from the original on 30 October 2023. Retrieved 9 January 2024.
  8. 1 2 3 4 5 Yukio Iwatsuki and Phillip C Heemstra (2022). "Family Sparidae". In Phillip C Heemstra; Elaine Heemstra; David A Ebert; Wouter Holleman; and John E Randall (eds.). Coastal Fishes of the Western Indian Ocean (PDF). Vol. 3. South African Institute for Aquatic Biodiversity. pp. 284–315. ISBN   978-1-990951-32-9.
  9. 1 2 3 Attwood, CG; Dawson, ME; Kerwath, Sven & Wilke, C. (2019). "Life history, distribution and seasonal movements of a threatened South African endemic seabream, Chrysoblephus gibbiceps". African Journal of Marine Science. 41 (4): 395–411. doi:10.2989/1814232X.2019.1686423.
  10. ↑ Francis Beukes (November 2020). "Catching Miss Lucy". Ski Boat. Retrieved 9 January 2024.
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