Mackerel
The term mackerel applies to over 30 different species across multiple fish families. Most belong to the family Scombridae, which also includes tuna and bonito. The type species for scombroid mackerels is the Atlantic mackerel, scientifically named Scomber scombrus. This species was first described by Linnaeus in 1758. Other species fall into tribes like Scombrini or Scomberomorini. Some confusion existed between the Pacific jack mackerel and the Chilean jack mackerel until they were recognized as separate species. These two are now classified under the family Carangidae rather than Scombridae. Additional species with mackerel-like characteristics appear in families Hexagrammidae and Gempylidae. The butterfly mackerel belongs to Scombridae but exhibits unique traits compared to its relatives. The Atlantic chub mackerel and Indo-Pacific chub mackerel were once thought to be subspecies of the same animal. In 1999, Collette established on molecular and morphological grounds that these are distinct species. The tribe Scombrini contains seven species split between two genera: Scomber and Rastrelliger. The genus Scomber includes the Atlantic mackerel and the chub mackerel. The genus Rastrelliger holds the short mackerel and the Indian mackerel. The tribe Scomberomorini comprises 21 species across three genera. Eighteen species reside within Scomberomorus while two belong to Grammatorcynus. A single species occupies the monotypic genus Acanthocybium known as the Wahoo.
Mackerel possess deeply forked tails and vertical tiger-like stripes along their backs. These stripes display an iridescent green-blue quality visible under sunlight. Their scales are extremely small if present at all. Unlike deep-bodied tuna, mackerel bodies remain cylindrical and slim. They lack a swim bladder entirely. Mackerel can retract their fins into grooves on their bodies for streamlining during high-speed swimming. The Atlantic mackerel swims at a sustained speed of 0.98 meters per second with burst speeds reaching 5.5 meters per second. Chub mackerel maintain a sustained speed of 0.92 meters per second but burst up to 2.25 meters per second. The Wahoo reaches speeds exceeding 70 kilometers per hour in short bursts. A layer of thin reflecting platelets exists on some mackerel stripes. In 1998 researchers E J Denton and D M Rowe argued these platelets transmit movement information to other fish. As orientation changes relative to another fish, light reflection shifts accordingly. This sensitivity gives mackerel considerable advantages while schooling or feeding. Fish have an optokinetic reflex sensitive to moving stripes that aids efficient schooling. The lateral line system helps maintain orderly formation within the school. Coastal mackerel tend to be smaller than open ocean varieties. The king mackerel represents one of the larger species found in tropical waters. Certain species maintain elevated body temperatures despite being cold-blooded generally. Endothermic bony fishes include the butterfly mackerel which is considered primitive among mackerels.
Most mackerel species inhabit temperate and tropical seas worldwide excluding Arctic and Southern Oceans. Some stocks migrate across oceans while others remain restricted to specific geographic ranges. Adult snake mackerel conduct diel vertical migration by staying deep during daylight hours. They rise to the surface at night to feed on available prey. Young and juvenile mackerel often reverse this pattern by staying near the surface during day. Atlantic chub mackerel has been spotted near Greenland in rare instances as global warming alters habitats. The Wahoo appears in all oceans between 59 degrees North latitude and 48 degrees South latitude. Mackerel spawn in fairly shallow waters before returning to deeper areas for winter inactivity. Spawning occurs near the surface because female eggs float freely in open sea. Individual females lay between 300,000 and 1,500,000 eggs per spawning event. Eggs and larvae drift pelagically until they develop into juveniles. Juvenile mackerel feed on zooplankton found floating in the upper water column. As adults they hunt small crustaceans including copepods and shrimp alongside squid. Schools of larger fish such as tuna follow migrating mackerel populations closely. Off Madagascar spinner sharks track these moving schools with precision. Bryde's whales utilize bubble nets to capture mackerel when possible. Some species migrate vertically based on food availability throughout daily cycles.
Chub mackerel account for about half the total capture production of scombroid mackerels globally. These two species combined represent approximately 75% of all scombroid mackerel catches worldwide. In 2009 commercial fishermen landed over five million tons of mackerel across global markets. Chilean jack mackerel remains the most commonly fished non-scombroid variety despite recent collapse risks. Purse seining captures smaller mackerel efficiently by encircling surface schools with fast auxiliary boats. Huge purse-seine vessels employ spotter planes to locate schooling fish before deployment. Sophisticated sonar systems track school shape while surrounding boats deploy nets rapidly. Lampara lamps attract chub mackerel at night for surround net operations. Drift nets and suitable trawls also catch these migratory fish effectively. Trollers use long booms lifted and dropped via topping lifts to haul lines electrically or hydraulically. Fish aggregating devices target mackerel swimming near ocean surfaces. The North Sea experienced severe overfishing that disrupted ecological balance and eliminated many jobs. Overfishing of king and Spanish mackerel occurred during the 1980s in Southeast US regions. Regulations restricted size limits fishing locations and bag amounts for recreational anglers. Gillnets were banned from waters off Florida starting in the late twentieth century. By 2001 mackerel stocks had recovered sufficiently after regulatory interventions.
Smaller mackerel function as critical food sources for larger predators including sharks whales and seabirds. Flocks of seabirds follow mackerel schools and attack them using sophisticated cooperative methods. Atlantic cod hunt smaller mackerel alongside other predatory fish species. Schools of tuna and marlin pursue migrating mackerel populations across vast distances. Spinner sharks follow these schools off Madagascar with remarkable precision. Bryde's whales feed on mackerel when available through skimming surface water or lunging techniques. Bubble net feeding allows whales to capture large quantities efficiently. Pelicans dive into schools to snatch individual fish from dense formations. Mackerel eggs float freely in open sea creating abundant food for larval stages. Zooplankton forms the primary diet for juvenile mackerel before they develop sharp teeth. Adult mackerel consume copepods shrimp squid and small crustaceans found throughout pelagic zones. Their position near the top of the food chain makes them vulnerable to overpredation. Large pelagic animals such as billfish and sea lions target adult mackerel regularly. The loss of mackerel populations disrupts entire marine ecosystems dependent on their biomass.
Mackerel flesh contains high levels of omega-3 fatty acids making it nutritionally valuable globally. Spoilage occurs quickly especially within tropical regions causing scombroid food poisoning risks. Fish should be consumed on day of capture unless properly refrigerated or cured immediately. Before nineteenth century canning development salting and smoking served as principal preservation methods. Historical records show stinking mackerel referenced more frequently than any other fish in English literature. France traditionally pickled mackerel with large amounts of salt allowing widespread distribution across regions. A 1976 survey by White Fish Authority revealed reluctance among British housewives to purchase mackerel. Less than ten percent of respondents had ever bought mackerel while only three percent did so regularly. Many UK fishmongers during the 1970s refused to display or stock this species due to low demand. Folklore suggested mackerel fed on dead sailor corpses leading to unclean status perceptions. Modern consumers increasingly recognize nutritional benefits despite historical stigma surrounding consumption practices. Proper handling prevents spoilage issues associated with rapid decomposition in warm climates.
The North Sea experienced overfishing crises that disrupted ecological balance and eliminated numerous jobs. Southeast US regions spanning Gulf of Mexico and Caribbean Sea faced similar challenges during the 1980s. Regulations restricted size limits fishing locations bag limits for recreational anglers and commercial operators alike. Gillnets were banned from waters off Florida beginning in late twentieth century years. By 2001 mackerel stocks recovered sufficiently after implementing strict regulatory measures. Chilean jack mackerel fisheries face potential collapse due to heavy exploitation levels. The International Union for Conservation of Nature lists several species as vulnerable or near threatened. Short mackerel and island mackerel carry Vulnerable designations under current assessments. Atlantic horse mackerel also holds Vulnerable status according to recent evaluations. Data deficient categories apply to Indo-Pacific king mackerel and Queen mackerel populations. Sustainable management requires balancing economic needs with ecological preservation goals. Regional organizations monitor stock levels continuously to prevent future collapses. Public awareness campaigns encourage responsible consumption habits among global markets.
Common questions
What is the scientific name of the Atlantic mackerel?
The type species for scombroid mackerels is the Atlantic mackerel, scientifically named Scomber scombrus. This species was first described by Linnaeus in 1758.
When did Collette establish that chub mackerel are distinct species?
In 1999, Collette established on molecular and morphological grounds that the Atlantic chub mackerel and Indo-Pacific chub mackerel are distinct species. They were once thought to be subspecies of the same animal before this classification change.
How fast can the Wahoo swim compared to other mackerel species?
The Wahoo reaches speeds exceeding 70 kilometers per hour in short bursts. The Atlantic mackerel swims at a sustained speed of 0.98 meters per second with burst speeds reaching 5.5 meters per second while Chub mackerel maintain a sustained speed of 0.92 meters per second but burst up to 2.25 meters per second.
Where do mackerel spawn and how many eggs do females lay?
Mackerel spawn in fairly shallow waters near the surface because female eggs float freely in open sea. Individual females lay between 300,000 and 1,500,000 eggs per spawning event.
What happened to mackerel stocks by 2001 after overfishing crises?
By 2001 mackerel stocks had recovered sufficiently after implementing strict regulatory measures following severe overfishing that disrupted ecological balance. Regulations restricted size limits fishing locations bag amounts for recreational anglers and banned gillnets from waters off Florida starting in the late twentieth century.