Sphyraena viridensis

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Sphyraena viridensis
Bicuda (Sphyraena viridensis), franja marina Teno-Rasca, Tenerife, Espana, 2022-01-08, DD 40.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Istiophoriformes
Family: Sphyraenidae
Genus: Sphyraena
Species:
S. viridensis
Binomial name
Sphyraena viridensis
Cuvier, 1829 [2]

Sphyraena viridensis, the yellowmouth barracuda or yellow barracuda is a predatory ray-finned fish from the family Sphyraenidae, the barracudas. It is found in the warmer waters of the eastern Atlantic Ocean and the Mediterranean. It is often confused with the European barracuda.

Contents

Description

S. viridensis has a fusiform body with a long, streamlined pointed snout which has a long mouth lined with two rows of sharp, fang-like teeth and a jutting lower jaw. There are no scales on the preoperculum, unlike the European barracuda, which has scales on both the anterior and posterior margins of the preoperculum. There are numerous transverse dark bars on the dorsum; these usually extend below the lateral line, while the same lines in the European barracuda do not do so. [3] The bars fade in dead specimens. Generally, the colouration of adult S. viridensis is dark above and silvery below (this is an example of countershading), [4] while juveniles are dark yellow or greenish in colour. [5] S. viridensis is smaller than its European counterpart, growing to a standard length of 65 cm, although the average length is 35–40 cm. [4] However, specimens up to 114.5 cm have been caught off the Azores. [5] The rod caught record is 10.2 kg, which was caught off Lanzarote in the Canary Islands in 2007. [6]

Distribution

The exact distribution of S. viridensis is unclear because of confusion with the European barracuda; however, it is known that it occurs in subtropical areas of the eastern Atlantic (around the Azores, Madeira, Cape Verde Islands and the Canary Islands). It has also been recorded in the Mediterranean, including off the coasts of Lebanon, [2] Israel, Algeria, Corsica and Sicily, and in the Adriatic Sea and the Aegean Sea. [3] [5]

Prey and Predators

In a study in the Azores, fish made up all of the diet of S. viridensis, with the most important species being the bluejack mackerel, which was found as having been preyed upon by 72.4% of the fish sampled and making up nearly two thirds of the weight of prey taken. [5] Other species recorded in this study included bogues, ornate wrasses and axillary sea breams, as well as an unidentified species of flying fish. [5] Unidentified fish remains were found in nearly 20% of the specimens sampled. The predatory behaviour of S. viridensis was observed in the same study; they were found to be active pursuit predators of fish, with one or many barracudas hunting together, either singling out lone prey or attacking shoals of prey fish. The pursuit was rapid and was usually over in 8–40 seconds, and the more fish involved, the higher the rate of success was. [5]

Some other known prey species of S. viridensis include the longspine snipefish, the boar fish, [5] and cephalopods and crustaceans. [4]

Bicudas (Sphyraena viridensis), franja marina Teno-Rasca, Tenerife, Espana, 2022-01-05, DD 60.jpg

Juveniles of S. viridensis are preyed upon by the lizard fish. This shows that there is an overlap in habitat between the juvenile barracudas and the lizard fish, which occurs in sheltered, very enclosed bays with sandy substrates. [7]

Behaviour

In summer, S. viridensis may form schools of up to 180 fish (although most schools only number 30-40 fish) in areas where there are strong currents. These schools are predominantly made up of sub-adults, with the smaller fish nearer to the surface and the larger ones, usually female, at the bottom, at depths of up to 30m. In winter, the only aggregations are small groups of juveniles in shallow bays. No territorial behaviour has been observed. Schooling is thought to be an anti-predator defence, to facilitate mating (with the smaller males being attracted to the larger females), and to increase the success rate of hunting. This species does not appear to mix with other barracuda species in mixed schools, but there are reports of these fish associating with whale sharks in the Azores and an instance of them actively swimming towards a manta ray. [5]

Fisheries

S. viridensis is landed in small quantities in the eastern Mediterranean by fishermen using in trammel-nets and beach-seines. [4] It has been reported from markets in Turkey but it is generally caught as a bycatch, although as numbers increase in the Mediterranean, it may be becoming a more important species for fisheries. [1]

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References

  1. 1 2 de Morais, L.; Smith-Vaniz, W.F.; Kara, M.; Yokes, B.; Pollard, D.; Carpenter, K.E.; de Bruyne, G. (2015). "Sphyraena viridensis". IUCN Red List of Threatened Species . 2015: e.T198714A15596713. doi: 10.2305/IUCN.UK.2015-4.RLTS.T198714A15596713.en . Retrieved 20 November 2021.
  2. 1 2 "Sphyraena viridensis Cuvier, 1829". fishbase.org. Retrieved 14 January 2017.
  3. 1 2 Jakov Dulĉić; Alen Soldo (2004). "On the occurrence of the Yellowmouth Barracuda Sphraena viridensis Cuvier 1829 (Pisces: Shyraenidae) in the Adriatic Sea" (PDF). Annales, Series Historia Naturalis. 14 (2): 225–227.
  4. 1 2 3 4 "Fishes of the NE Atlantic and the Mediterranean : Yellowmouth barracuda (Sphyraena viridensis)". Marine Species Identification Portal. ETI Bioinformatics. Retrieved 14 January 2017.
  5. 1 2 3 4 5 6 7 8 João Pedro Barreiros; Ricardo Serrão Santos; Alfredo E.S. Borba (2002). "Food habits, schooling and predatory behaviour of the yellowmouth barracuda, Sphyraena viridensis (Perciformes: Sphyraenidae) in the Azores". Cybium. 26 (2): 83–88.
  6. "barracuda, yellowmouth (Sphyraena viridensis)". International Game Fish Association. Retrieved 14 January 2017.
  7. João P. Barreiros; Frederico Cardigos; Marta S.C. Soares; Leonardo F. Machado (2007). "Juvenile Sphyraena viridensis, preyed by the lizard fish Synodus saurus, a new predatory association from the Azores (NE Atlantic Ocean)" (PDF). Cybium. 32 (3): 272–274.