Atlantic horse mackerel

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Atlantic horse mackerel
Atlantic Horse Mackerel.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Carangiformes
Family: Carangidae
Genus: Trachurus
Species:
T. trachurus
Binomial name
Trachurus trachurus
Synonyms [3]
  • Scomber trachurusLinnaeus, 1758
  • Caranx trachurus(Linnaeus, 1758)
  • Trachurus vulgarisFleming, 1828
  • Trachurus europaeusGronow, 1854

The Atlantic horse mackerel (Trachurus trachurus), also known as the European horse mackerel or common scad, is a species of jack mackerel in the family Carangidae, which includes the jacks, pompanos and trevallies. It is found in the eastern Atlantic Ocean off Europe and Africa and into the south-eastern Indian Ocean. It is an important species in commercial fisheries and is listed as a Vulnerable species on The IUCN Red List of Threatened Species.

Contents

Description

The Atlantic horse mackerel has quite a slender, quite compressed body with a large head in which the rear of the upper jaw reaches the front of the eye and the lower jaw projects beyond the upper jaw. The eye has a well developed adipose eyelid. [4] It has two dorsal fins, [5] the first is tall [3] and has seven thin spines, with the final spine being much shorter than the others. The second dorsal fin is separated from the first by a narrow gap and is considerably longer than the first [5] with 29-33 soft rays. [6] The anal fin is about as long as the second dorsal fin and there are two separate spines at its anterior end. [5] The moderately sized pelvic fin has a single spine and five soft rays and has its origin below the end of the pectoral fin base. [4] A curved line of 33–40 bony scutes runs from the head to the tail, each having a small spine which increase in size and become bonier towards the tail. [7] The lateral line has a total of 66–67 scales, of which 31–36 are scutes. [5] [6] It is dark blue in colour with silvery flanks and a white belly, there is a dark spot on the operculum. This species attains a maximum fork length of 60 centimetres (24 in), [6] although they are normally around 25 cm (10 in) and a weight of 1.5 kg (3 lb). [5]

Distribution

The Atlantic horse mackerel occurs in the north and eastern Atlantic Ocean, the Mediterranean Sea and Sea of Marmara and the Black Sea. In the Atlantic it is found from Norway to South Africa where it may extend around the Cape of Good Hope along the southern African Indian Ocean coast Maputo in Mozambique. [1] However, if Trachurus capensis is considered to be a valid species then this species is restricted to the north east Atlantic. [8] It has been recorded in Cape Verde but is thought to occur there only as a vagrant. [1]

Habitat and biology

The Atlantic horse mackerel is a benthopelagic species which normally occurs over sandy substrates at depths of 100–200 m (50–110 fathoms; 330–660 ft), although it has been reported as deep as 1,050 m (570 fathoms; 3,440 ft) and it is sometimes found nearer the surface waters. [4] It is a migratory species, moving northwards in the summer months and returning southwards when the sea temperature starts to fall. [7] In the north east Atlantic two stocks are recognised, the western stock spawns in a wide area from Ireland to the Bay of Biscay in the early Spring and moves northward to the southern coats of Norway and the northern North Sea in the summer. The North Sea stock spawns in the southern part of the North Sea during the summer and then migrates northwards into the central North Sea, the Skagerrak and the Kattegat. Off Mauritania this species has its main spawning season in November to January while the related Cunene horse mackerel (Trachurus trecae) spawns in June and August. [1] Off Ireland spawning occurs irregularly during the summer from June to August reaching its peak in July. The females spawn in batches, each of up to 140,000 eggs and hatching larvae 5 mm (316 in) in length. Spawning is indeterminate meaning that the total number of eggs a female can produce is dependent on factors which can change over the course of a spawning season. [7] The eggs and larvae are pelagic. [4]

The juveniles of thus species frequently often shoal with the juveniles of other fish species, mainly Atlantic herring (Clupea clupea) and with other species of horse mackerels such as the Mediterranean horse mackerel (T. mediterraneus) and blue jack mackerel (T. picturatus). [4] Juveniles are also often encountered sheltering in the tentacles of jellyfish. In South Africa the maximum recorded age is 24 years while 40 years of age has been recorded in the northeast Atlantic. They are thought to breed from two to four years old for females. Off Mauritania, the juveniles are caught at depths of 200–300 m (110–160 fathoms; 660–980 ft) while mature fish are taken in shallower waters of less than 100 m (55 fathoms; 330 ft).The age and growth of the Atlantic horse mackerel vary across its extensive range and are affected by the levels to which stocks are exploited. [1]

The diet of this species, in both juveniles and adults, is copepods, shrimps, small fishes and squids. [6] An examination of the stomach contents of Atlantic horse mackerels caught in the Aegean Sea recorded a total of 60 different prey species which belonged to five major systematic groups, polychaetes, crustaceans, molluscs, arrow worms and bony fish. Copepods, Euphasids and Mysids made up the highest percentage of food eaten. Bony fish were the secondmost numerous food ingested, while polychaeta and arrow worms were infrequently recorded food items. The diet showed very little seasonal variation with copepods and mysids making up the largest proportion of prey throughout the year, with fishes being most frequent prey except in the spring. Larger fish – those over 16.9 cm (6+58 in) – feed largely on the larvae of bony fishes. No less than 45 species of copeopod were identified in this study, and Acartia clausi and Oncea media were numerous and important throughout the year. Crustaceans were the most important prey to be eaten by this species in all seasons, however, bony fish were the most important prey items for larger fish. [9]

Taxonomy and naming

The Atlantic horse mackerel is the type species of the genus Trachurus but when Constantine Samuel Rafinesque created the genus in 1810 he used Trachurus saurus as the type species but Carolus Linnaeus had used the name Scomber saurus and had already described Scomber trachurus so Rafinesque's name was invalid. [10] The genus Trachurus is part of the subfamily Caranginae of the family Carangidae, which is the largest family in the order Carangiformes. [11] The generic and specific names are a compound of the Greek trachys meaning "rough" and oura meaning "tail", this appears to be an ancient name for horse mackerels, presumably in reference to the spiny scutes on the caudal peduncle. [12]

The common name horse mackerel has been said to derive from the belief that other fishes rode on its back but it may derive from the old Dutch word Horsmakreel which means a mackerel which spawns over a shallow or bank, a hors, and this was taken into English as "horse mackerel". [13]

The Cape horse mackerel (Trachurus capensis) is considered to be the subspecies T. trachurus capensis of the Atlantic horse mackerel by some authorities and it is thought that there is no adequate series of these specimens of this taxa along the coast of Africa available to confirm the validity of this taxon. [8]

Fisheries

Trachurus trachurus catch Trachurus trachurus (catch).jpg
Trachurus trachurus catch

The Atlantic horse mackerel is fished for commercially using trawls, longlines, purse seines (using artificial light), traps and on line gear. In 1999 the Food and Agriculture Organization stated that the total catch reported to it was 322 207 tonnes with the largest catches being in the Netherlands and in Ireland. [4] There is a total allowable catch (TAC) in the North Sea for this species and landings have consistently been below this level [14] but the TAC is not in line with the scientific advice. There have been calls to create a management plan for the Atlantic horse mackerel in the North Sea but currently there are no specific management objectives for it. The stock needs to be assessed and management objectives should be set before the fishery can be shown to be sustainable. [15]

Conservation

The IUCN classify the Atlantic horse mackerel as Vulnerable because even if there has been no decline in the population in European waters there have been greater than ninety percent declines off the West African coast which means that this species will have undergone a decline of at least 35-40% over the past three generation lengths, which are estimated at 30–35 years. [1] The International Council for the Exploration of the Sea (ICES) classifies the population of this species as below the safe biological limit for exploitation. [7] The populations are experiencing a slow decline with increased fishing pressure at the maximum sustainable yield since 2006 with low recruitment since 2004. [7]

Human uses

The Atlantic horse mackerel is consumed fresh. It may be preserved by freezing, salting and drying, smoking and canning. It can be prepared by frying, broiling or baking. [4] The flesh is said to have a pleasant flavour with an oily delicate texture which is a good source of omega-3 fatty acids. [16] Nutritionally 100g of the flesh of the Atlantic horse mackerel provides 97 kcal of energy and is made up of: [17]

Chicharros en escabeche Chicharros en escabeche.jpg
Chicharros en escabeche

In Iberia it may be prepared as an escabeche while some are exported to Japan as aji to be used in sushi. [18] They are also an important ingredient in Sicilian cuisine. [17]

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<span class="mw-page-title-main">Atlantic mackerel</span> Species of fish

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<span class="mw-page-title-main">Crevalle jack</span> Species of fish

The crevalle jack, also known as the common jack, black-tailed trevally, couvalli jack, black cavalli, jack crevale, or yellow cavalli is a common species of large marine fish classified within the jack family, Carangidae. The crevalle jack is distributed across the tropical and temperate waters of the Atlantic Ocean, ranging from Nova Scotia, Canada to Uruguay in the western Atlantic and Portugal to Angola in the eastern Atlantic, including the Mediterranean Sea. It is distinguishable from similar species by its deep body, fin colouration and a host of more detailed anatomical features, including fin ray and lateral line scale counts. It is one of the largest fish in the genus Caranx, growing to a maximum known length of 124 cm and a weight of 32 kg, although is rare at lengths greater than 60 cm. The crevalle jack inhabits both inshore and offshore waters to depths of around 350 m, predominantly over reefs, bays, lagoons and occasionally estuaries. Young fish dispersed north by currents in the eastern Atlantic are known to migrate back to more tropical waters before the onset of winter; however, if the fish fail to migrate, mass mortalities occur as the temperature falls below the species' tolerance.

<span class="mw-page-title-main">Pacific jack mackerel</span> Species of fish

The Pacific jack mackerel, also known as the Californian jack mackerel or simply jack mackerel, is an abundant species of pelagic marine fish in the jack family, Carangidae. It is distributed along the western coast of North America, ranging from Alaska in the north to the Gulf of California in the south, inhabiting both offshore and inshore environments. The Pacific jack mackerel is a moderately large fish, growing to a maximum recorded length of 81 cm, although commonly seen below 55 cm. It is very similar in appearance to other members of its genus, Trachurus, especially T. murphyi, which was once thought to be a subspecies of T. symmetricus, and inhabits waters further south. Pacific jack mackerel travel in large schools, ranging up to 600 miles offshore and to depths of 400 m, generally moving through the upper part of the water column.

<span class="mw-page-title-main">Golden trevally</span> Species of fish

The golden trevally, also known as the golden kingfish, banded trevally or king trevally, is a species of large marine fish classified in the jack and horse mackerel family Carangidae, and the only member of the monospecific genus Gnathanodon. The golden trevally is widely distributed throughout the tropical and subtropical waters of the Indian and Pacific Oceans, ranging from South Africa in the west to Central America in the east, extending to Japan in the north and Australia in the south. The species predominantly occupies inshore waters where it inhabits both reef and sandy substrates. The golden trevally is easily distinguished from its relatives by its fleshy, rubbery lips and unique colouration, which ranges from bright yellow with black bars as a juvenile to a golden-silvery colour as an adult. It is known to grow to 120 centimetres (47 in) in length and 15 kilograms (33 lb) in weight. The golden trevally schools as a juvenile, often closely following larger objects including sharks and jellyfish. The species uses its protractile jaws to suck out prey from the sand or reef, and consumes a variety of fish, crustaceans and molluscs. Spawning aggregations gather at night at different times of the year throughout its range. The golden trevally is a considerable constituent of several Middle Eastern fisheries and being of minor importance to many others, with a worldwide annual catch of 1,187 metric tons to 3,475 metric tons recorded between 2000 and 2010. The golden trevally is a popular gamefish, taken by bait, lure, fly and also spear throughout its range. Several Asian countries currently farm the fish in caged aquaculture. Due to their brilliant colouration, juveniles are popular in marine aquaria.

<span class="mw-page-title-main">Yellowtail horse mackerel</span> Species of fish

The yellowtail horse mackerel, also known as the yellowtail scad, is a jack in the family Carangidae found around Australia and New Zealand at depths to 500 m. Its length is up to 50 centimetres (20 in). The yellowtail scad is the only member of the monotypic genus Atule and is distinguished from similar species by a well-developed adipose eyelid and finlet-like extensions of the last rays of the dorsal and anal fins. It inhabits coastal areas such as bays and coral reefs, preying on small fishes and crustaceans. The yellowtail scad is an important component of fisheries throughout its range, taken by a number of netting and hook-and-line methods. It is a prized food fish in some regions and is cooked or preserved by a variety of methods.

<span class="mw-page-title-main">Shrimp scad</span> Species of fish

The shrimp scad, is a species of widespread tropical marine fish of the jack family, Carangidae. The shrimp scad is widely distributed in the tropical and subtropical western Indian Ocean and areas of the eastern Pacific Ocean, ranging from South Africa in the west to Hawaii in the east, including Japan and Australia to the north and south. The species is commonly found on inshore reefs and sandy substrates. It has the common body profile of a scad, and may be difficult to differentiate from others in the genus Alepes. It is one of the larger scads, growing to 40 cm, but often is encountered at much smaller sizes. The shrimp scad often forms large schools, and is carnivorous, consuming a variety of crustaceans and small fish. It is of moderate importance to fisheries throughout its range.

<span class="mw-page-title-main">Malabar trevally</span> Species of fish

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<span class="mw-page-title-main">Yellowtail scad</span> Species of fish

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The blacktip trevally, also known as the blacktip kingfish or yellowtail kingfish, is a species of large marine fish classified in the jack family Carangidae. The blacktip trevally is distributed throughout the tropical to subtropical Indian and West Pacific Oceans, ranging from South Africa in the west to Fiji, Japan and northern Australia in the east. It inhabits coastal waters throughout its range, preferring moderately deep clear waters over rocky and coral reefs. The blacktip trevally is easily distinguished by its yellow fins and a dark upper caudal fin lobe which gives the species its common name, as well as a host of other anatomical features. The species is known to reach a maximum size of 1 m. It is a benthopelagic predator, commonly forming small shoals where it takes a variety of fishes, cephalopods and crustaceans as prey. Little is known of reproduction in the species, and spawning is assumed to take place in more tropical regions of its range, with juveniles known to inhabit bays and large estuaries. Blacktip trevally are often caught using hook and line and various nets in commercial fisheries although don't make up a large part of the market. They are also popular with anglers due to their fighting ability and decent table qualities.

<span class="mw-page-title-main">False scad</span> Species of fish

The false scad, also known as the spotfin scad, ten-finned horse mackerel and yellow horse mackerel, is a species of medium-sized marine fish classified in the jack family Carangidae. The false scad is distributed throughout the tropical and temperate waters of the eastern Atlantic Ocean from Namibia in the south to Spain and throughout most of the Mediterranean in the north. The species has an atypical body form compared to other species of Caranx, and can be distinguished from these on its elongate 'scad-like' body shape alone. Distinguishing the species from members of Decapterus and Trachurus is more difficult, requiring detailed anatomical analysis. The false scad is known to grow to a length of 60 cm and a weight of 1 kg. The species lives both pelagically and demersally in continental shelf waters, ranging from depths of 15 to 200 m. It is a predatory fish, taking small fishes, crustaceans including euphausiids and shrimps, and cephalopods as its main prey, with significant dietary shifts as it ages. The false scad reaches sexual maturity at 2 years of age, with spawning occurring between April and July in shallow inshore waters, where the juveniles remain. The species is of major importance to fisheries throughout its range, but particularly from Morocco to Senegal, with annual catches ranging from 500 to 19000 t. The species is caught using trawls, seine nets and gill nets and sold fresh, frozen or salted.

<span class="mw-page-title-main">Torpedo scad</span> Species of fish

The torpedo scad, also known as the hardtail scad, finny scad, finletted mackerel scad or cordyla scad, is a species of moderately large marine fish classified in the jack and horse mackerel family, Carangidae. The torpedo scad is distributed throughout the tropical Indo-Pacific region, ranging from South Africa in the west to Tonga in the east, extending to Japan in the north and Australia in south. It is a schooling pelagic fish which occupies the surface layers of both inshore and offshore oceanic waters. The torpedo scad is easily identified by both its 'torpedo' shaped body and a series of detached finlets at the rear of both the dorsal and anal fins. The largest recorded individual was 80 cm long and weighed 4 kg, although it is more common at lengths less than 40 cm. It is a predatory species, taking a variety of fish, cephalopods and crustaceans by both active and filter feeding. There is a shift in diet as the species grow; however fish is the dominant prey in all size classes. Torpedo scad reach sexual maturity at 22 cm in females and 26.4 cm in males, with spawning occurring between March and July in India, where significant research into larval growth and morphometrics has been carried out.

<span class="mw-page-title-main">Chilean jack mackerel</span> Species of fish

The Chilean jack mackerel, sometimes called the Inca scad or Peruvian jack mackerel, is a species of jack mackerel in the genus Trachurus of the family Carangidae. Since the 1970s, it has become one of the world's more important commercial fish species. High volumes have been harvested, but the fishery may now be in danger of collapsing.

<span class="mw-page-title-main">Cape horse mackerel</span> Species of fish

The Cape horse mackerel is a mackerel-like species in the family Carangidae. It is a pelagic species of the south eastern Atlantic Ocean which is a target of fisheries, mainly as bycatch.

<span class="mw-page-title-main">Japanese jack mackerel</span> Species of fish

The Japanese jack mackerel, also known as the Japanese horse mackerel or Japanese scad, is a species named after its resemblance to mackerel but which is in the family Carangidae, the jacks, pompanos, trevallies and scads. Their maximum reported length is 50 cm (20 in) with a common length of 35 cm (14 in). They have a maximum reported weight of 0.66 kg (1.5 lb) and a maximum reported age of 12 years. They are found around the coast of Japan, apart from Okinawa Island, usually on sandy bottoms of 50–275 m (164–902 ft) deep. They feed mainly on small crustaceans such as copepods, and shrimps and small fish. They are similar to the yellowtail horse mackerel around New Zealand and Australia, apart from having more gill rakers and larger eyes.

<i>Trachurus lathami</i> Species of fish

Trachurus lathami is a species of fish in the family Carangidae and the genus Trachurus, the jack mackerels. Common names include rough scad and horse mackerel in English, as well as chinchard frappeur (French), chicharro garretón (Spanish), jurel, and carapau, garaçuma, surel, and xixarro. It is native to parts of the western Atlantic Ocean, including seas off the eastern coasts of North and South America and the Gulf of Mexico.

Trachurus delagoa, the African scad, is a species of jack mackerel from the family Carangidae which is found in the south western Indian Ocean.

<span class="mw-page-title-main">Arabian scad</span> Species of fish

The Arabian scad is a species of jack mackerel from the family Carangidae which is found in the Western Indian Ocean.

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