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Stromateidae
Stromateidae
Stromateidae
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Butterfish
Temporal range: Early Oligocene–present
Peprilus paru
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Clade: Percomorpha
Order: Scombriformes
Suborder: Stromateoidei
Family: Stromateidae
Rafinesque, 1810
Genera

See text for species.

The family Stromateidae or butterfish contains 15 species of ray-finned fish in three genera. Butterfishes live in coastal waters off the Americas, western Africa and in the Indo-Pacific.

The endemic New Zealand species Odax pullus is commonly called butterfish, but is from a separate family Odacidae. The Japanese butterfish Psenopsis anomala is from the separate family Centrolophidae. The African butter catfish is also known as the butter fish. In South Australia, the Argyrosomus japonicus is commonly called butterfish as well.

Species

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Fossil species

[edit]
  • †Pinichthys Bannikov, 1985
    • †P. fractus Bannikov, 1985
    • †P. pulcher Bannikov, 1988
    • †P. shirvanensis Bannikov, 2021

The only known fossil butterfish is Pinichthys from the Early Oligocene to Miocene of Germany, Poland, Ukraine, North Caucasus (Russia) and Azerbaijan. It may potentially be the common ancestor of all extant butterfish genera.[3][4][5]

Timeline

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QuaternaryNeogenePaleogeneHolocenePleist.Plio.MioceneOligoceneEocenePaleoceneStromateusQuaternaryNeogenePaleogeneHolocenePleist.Plio.MioceneOligoceneEocenePaleocene

Mislabelling

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Escolar is sometimes fraudulently labelled as butterfish. This can be more hazardous than other fish mislabeling due to the potential health effects of escolar.

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Stromateidae

View on Grokipedia
from Grokipedia
Stromateidae, commonly known as butterfishes or pomfrets, is a family of ray-finned fishes in the order Scombriformes, consisting of three genera (Stromateus, Peprilus, and Pampus) and 17 species characterized by their deep, compressed bodies, continuous dorsal fin, and the absence of pelvic fins in adults despite the presence of a pelvic girdle. The name derives from the Greek stromatos (bedspread) and stromateios (flattened, spotted fish), alluding to their distinctive body shape and coloration. These coastal, benthopelagic fishes typically feature an anal fin with 2–6 spines followed by 30–50 soft rays and are adapted to marine and brackish waters, often forming schools in shallow to moderate depths. Distributed across the Atlantic coasts of North and , western , and the Indo-Pacific regions, Stromateidae species inhabit diverse coastal environments from subtropical to temperate zones, with some tolerating brackish conditions. Ecologically, they play roles as mid-trophic level predators and prey, feeding on small , zooplankton, and , while juveniles often exhibit pelagic habits before settling into benthic or near-bottom lifestyles. They are generally not suitable for aquarium maintenance due to their specific needs. Several species hold economic significance, particularly in fisheries; for instance, the Atlantic butterfish (Peprilus triacanthus) supports sustainable U.S. wild-capture fisheries, while pomfrets in the genus Pampus, such as the silver pomfret (Pampus argenteus), are valued globally for their nutritional content and are commercially harvested in the Indo-Pacific for human consumption.

Taxonomy and Systematics

Classification

Stromateidae belongs to the kingdom Animalia, phylum Chordata, class Actinopterygii, order Scombriformes, suborder Stromateoidei, and family Stromateidae. This hierarchical placement reflects the family's position among ray-finned fishes, characterized by advanced percomorph traits such as a spinous and specific cranial modifications. Phylogenetically, Stromateidae is nested within the diverse clade, a major subdivision of Acanthopterygii that encompasses over 17,000 species of advanced bony fishes. Within Scombriformes, the family shares close affinities with other pelagic groups, including the suborder Icosteoidei (containing families like Icosteidae), supported by molecular and morphological data indicating a shared ancestry in the series Pelagiaria. This positioning highlights Stromateidae's evolutionary ties to open-ocean lineages adapted to epipelagic environments. The family was originally established by in 1810, based on observations of butterfish-like species with distinctive compressed bodies and fin structures. Subsequent revisions have maintained the name Stromateidae without significant synonymy, though earlier classifications sometimes grouped it under broader arrangements before molecular phylogenies refined its placement in Scombriformes. The family currently includes 3 genera and 21 species.

Genera and Species Diversity

The family Stromateidae encompasses three genera: Peprilus Cuvier, 1829, with 9 valid ; Stromateus Linnaeus, 1758, with 3 valid ; and Pampus Bonaparte, 1834, with 9 valid , yielding a total of 21 extant . Recent phylogenetic studies have proposed revisions, suggesting approximately 7 valid in Pampus due to synonymies and cryptic diversity. The genus Peprilus, derived from the ancient Greek "peprilos," an obscure name for a Thracian fish, comprises the most species within the family and is distinguished by its primarily Atlantic distribution, with additional representation in the eastern Pacific; species such as P. triacanthus and P. paru are widespread along western Atlantic coasts from North America to Argentina, while P. simillimus occurs in the northeastern Pacific from Canada to Mexico. In contrast, Stromateus, named from the ancient Greek "stromateus" meaning a flat, patchwork-like fish alluding to its compressed body and coloration, features species in tropical and subtropical waters across the Atlantic and Indo-Pacific; for instance, S. fiatola ranges from the Mediterranean to South Africa, S. stellatus inhabits the Indo-West Pacific, and S. brasiliensis is restricted to the southwestern Atlantic off Brazil and Argentina. Pampus, etymologically from the Spanish/ vernacular "" for silvery, compressed fishes, shows the highest within the Indo-West Pacific, with all confined to coastal and shelf waters from the to the western Pacific; notable examples include P. argenteus and P. chinensis, which exhibit broad distributions across the Indian and western Pacific Oceans, reflecting historical connectivity via the Tethys Seaway. Diversity patterns indicate a concentration of in Peprilus and Pampus, with over 80% of the family's in these two genera, while Stromateus represents a transitional form bridging Atlantic and Indo-Pacific realms; overall, the family displays a bimodal distribution, with Atlantic-centric (Peprilus) and Indo-Pacific-dominant (Pampus) clades separated by limited across the .
GenusValid Species CountPrimary Distribution Patterns
Peprilus9Atlantic (widespread, western and eastern); eastern Pacific (limited)
Stromateus3Tropical/subtropical Atlantic and
Pampus9 (coastal to shelf waters)

Physical Characteristics

Morphology

Stromateidae, commonly known as butterfishes, exhibit a distinctive characterized by a deep, laterally compressed form that is often oval or disc-like, facilitating maneuverability in coastal and pelagic environments. This compressed morphology reduces drag and enhances stability during schooling behaviors typical of the family. The body is covered in tiny scales that are easily shed, contributing to a smooth, slippery texture. The fin structure of Stromateidae is adapted for agile swimming in open water. A single continuous dorsal fin spans the length of the back, often falcate or triangular in profile, providing lift and propulsion without interruption. The caudal fin is deeply forked, aiding in rapid acceleration, while pectoral fins are long and pointed for fine control. Adults lack pelvic fins entirely, though remnants of the pelvic girdle persist internally, a derived trait reflecting evolutionary reduction in the suborder Stromateoidei. The dorsal and anal fins incorporate spinous anterior rays, typically numbering 2-6 in the anal fin, followed by numerous soft rays (30-50 in the anal), which support undulating movements. Head morphology in Stromateidae features a relatively small mouth suited to their diet, paired with large eyes that enhance vision in low-light pelagic zones. dentition is minimal, consisting of small, uniserial teeth or sometimes absent, an adaptation linked to feeding on soft-bodied gelatinous prey like jellyfishes, which requires little mechanical processing. The scales impart a silvery sheen to the body, aiding in against predators by reflecting ambient light from above. Internally, Stromateidae display variations in swim bladder morphology, with some species possessing a reduced or physoclistous bladder that limits extensive control. This structure, often elongate and without pneumatic ducts, correlates with their passive drifting lifestyle among gelatinous organisms.

Size, Coloration, and Adaptations

Species in the Stromateidae family generally reach maximum standard lengths of 15 to 30 cm, with some, like Stromateus fiatola, attaining up to 50 cm. Juveniles are notably smaller, often measuring under 10 cm, and possess a more translucent body that facilitates integration into open-water environments. Coloration across the family features silvery or whitish sides and ventral surfaces contrasted with darker blue-green or brownish dorsal regions, often accented by irregular dark spots. This pattern imparts an iridescent sheen and exemplifies , which minimizes visibility in pelagic zones by blending the against light from above and light from below. Juveniles may display additional vertical bars or pale orange hues that enhance their translucency. Key adaptations include oily flesh rich in wax esters and diacylglyceryl ethers, which aids buoyancy alongside the swim bladder in these deep-bodied pelagic fishes. Certain species, such as pomfrets (Pampus spp.), demonstrate tolerance to low-oxygen conditions, with larvae maintaining metabolic functions at reduced dissolved oxygen levels. Juveniles frequently form protective associations with jellyfish through mimicry of their appearance and swimming behavior, a widespread trait in the suborder Stromateoidei that reduces predation risk during early ontogeny.

Distribution and Habitat

Geographic Distribution

The family Stromateidae, comprising butterfishes and related species, exhibits a widespread but discontinuous global distribution primarily in coastal marine waters of the Atlantic and oceans. The primary ranges include the Western Atlantic from the northern temperate waters off southward to subtropical and temperate regions of , the Eastern Atlantic along the western coast of , and the along tropical and subtropical coasts of and . This distribution reflects the family's adaptation to varied coastal environments, though specific habitat preferences such as depth and substrate are detailed elsewhere. In the Western Atlantic, Stromateidae are well-represented from and southward to , encompassing both temperate and tropical zones. For instance, Peprilus triacanthus (Atlantic butterfish) occurs from to the Gulf coasts of , with peak abundance between and the . Further south, Peprilus paru extends the family's range along the eastern coasts of North and South America, while Stromateus brasiliensis is confined to the Southwest Atlantic from southern to . The Eastern Atlantic hosts fewer species, primarily along western , where Stromateus fiatola ranges from the and Mediterranean southward to the in . In the Indo-Pacific, the genus dominates, with distributed along the coasts of , the , Arabian Gulf, and Japan Archipelago. Pampus chinensis and Pampus cinereus further occupy tropical waters from the western Pacific to the . Biogeographic patterns within Stromateidae show a clear tropical-temperate overlap, with species like Peprilus triacanthus bridging colder northern waters and warmer southern extensions, while taxa remain largely subtropical. The family is also present in the Eastern Pacific, particularly off , with species such as Peprilus medius from to and the Galapagos, and Stromateus stellatus from to , indicating trans-Pacific representation in southern latitudes. Overall, the three genera—Peprilus, Stromateus, and —exhibit distinct regional : Peprilus and Stromateus in the Atlantic (with Eastern Pacific extensions), and Pampus exclusively in the Indo-West Pacific.

Habitat Preferences and Migration

Stromateidae species occupy a range of depths from pelagic surface waters to near-bottom habitats at 0-200 m, primarily over sandy or muddy substrates on continental shelves. They are frequently associated with soft-bottom environments in coastal and shelf areas, where juveniles often aggregate under floating debris or with for protection. During summer months, these fishes shift inshore toward shallower coastal zones, while in winter they migrate offshore to deeper shelf edges, adapting to seasonal environmental changes. These fishes thrive in temperate to tropical marine environments, typically in waters with temperatures between 10-25°C and salinities of 30-35 ppt, though some species exhibit broader eurythermal and tolerances. They show a strong association with oceanographic features such as currents and zones, which enhance and support their prey availability in coastal shelf ecosystems. Migration patterns in Stromateidae include seasonal latitudinal shifts, with northward movements in summer for spawning and feeding in warmer inshore areas, followed by southward retreats in winter to offshore overwintering grounds. For instance, the Atlantic butterfish (Peprilus triacanthus) overwinters along the 183 m isobath of the continental shelf and migrates inshore north of during spring and summer. Additionally, many species undertake daily vertical migrations, remaining near the bottom during the day and ascending into the water column at night, a observed in species like the Gulf butterfish (Peprilus burti).

Biology and Ecology

Reproduction and Life Cycle

Members of the Stromateidae family are oviparous and pelagic spawners, releasing buoyant, transparent, spherical eggs measuring 0.68–0.84 mm in diameter into the open water column. Spawning typically occurs in summer months, with peaks observed in July in the North Atlantic for species such as Peprilus triacanthus, where reproduction begins in June and subsides by August in regions like the Gulf of Maine. Many species exhibit batch spawning, allowing females to release multiple egg batches per season; for instance, Peprilus medius females can spawn at least three times during the spawning period, supporting higher overall reproductive output. Fecundity varies by species and size, reaching up to approximately 88,000 eggs per female in Pampus argenteus based on relative batch fecundity of 176 eggs per gram of body weight. The eggs hatch into planktonic larvae that drift in the upper water layers, where they undergo early development over several weeks, with hatching times influenced by temperatures around 14–15°C. Larval stages feature typical perciform characteristics, including early fin formation and pigmentation patterns that aid in identification from related taxa. As juveniles reach 2–5 cm in length, they often form symbiotic associations with medusae and drifting macroalgae, using these gelatinous hosts for protection from predators and possibly for camouflage in coastal frontal zones. This behavior is documented across genera, such as in Stromateus stellatus and Peprilus paru, where early juveniles aggregate near scyphomedusae like Aurelia aurita. Sexual maturity is generally attained at 1–2 years of age and lengths of 10–15 cm, as seen in Peprilus triacanthus, where most individuals become reproductively active by age 1. Lifespans typically range from 3–6 years, though few P. triacanthus exceed 3 years due to high natural mortality rates. Batch spawning strategies in species such as Pampus argenteus enable multiple reproductive events over 4–6 months, from mid-May to early October, enhancing lifetime reproductive success within their short lifespans. Recent studies suggest that warming ocean temperatures may be altering spawning timings and larval survival rates in some populations (as of 2023).

Diet and Feeding Habits

Members of the Stromateidae family primarily consume , including (such as in the genera Chrysaora and Cyanea), salps (Salpidae), and ctenophores (like Mnemiopsis leidyi), alongside small crustaceans such as copepods and euphausiids (e.g., Meganyctiphanes norvegica), polychaetes, larvae, squids, and arrow worms. This diet reflects an opportunistic planktivorous strategy, where gelatinous prey can constitute up to 80% of stomach contents in some , such as Peprilus triacanthus, allowing exploitation of abundant but low-nutritional-value resources in pelagic environments. Prey availability is influenced by oceanographic conditions in their preferred semi-pelagic habitats, where aggregations of concentrate near thermoclines or surface layers. Stromateids employ a combination of filter-feeding and active predation tactics, utilizing elongated gill rakers to small planktonic organisms during ram ventilation while swimming. Larger gelatinous prey are often consumed by biting or tearing, facilitated by a specialized pharyngeal sac lined with papillae that aids in grinding and processing soft-bodied items, preventing escape of low-density foods. Feeding activity peaks nocturnally at the surface, where individuals disperse from schools to target concentrated patches, enhancing encounter rates with evasive prey. Ontogenetic shifts in diet occur as larvae and juveniles initially focus on smaller planktonic particles like copepods and appendicularians, transitioning to larger and occasional larvae or polychaetes in adults. This progression aligns with increasing body size and mobility, positioning Stromateidae as mid-level planktivores at a of approximately 3.9, where their high-lipid, oily body composition (approximately 10% fat content) supports sustained energy needs despite the low caloric density of their primary prey.

Behavior and Predation

Members of the Stromateidae family, commonly known as butterfishes, exhibit schooling behavior as a primary defensive strategy in their pelagic environment. Adults form large, loose schools over continental shelves, which provide protection against predators through collective vigilance and confusion effects during attacks. Juveniles, in particular, aggregate in these schools to enhance in open waters, transitioning from earlier associations with floating debris. This schooling is semi-pelagic and often occurs during daylight hours, aiding in and foraging efficiency while minimizing individual exposure to threats. Stromateidae species face predation from a diverse array of higher organisms, including larger predatory fish such as tunas, billfishes like (Xiphias gladius), (Pomatomus saltatrix), and weakfish. s, notably terns (e.g., Sterna hirundo) and alcids (e.g., razorbills Alca torda), also consume butterfishes, particularly in the Northeast U.S. where they comprise 1-5% of diets in most years, though rates can increase with shifts in preferred prey availability. Marine mammals prey upon them as part of broader consumption, contributing to high natural mortality rates observed in the family. To evade these predators, Stromateidae rely on rapid swimming speeds and tight schooling formations that disrupt targeting by visually hunting assailants. Ecologically, Stromateidae play a vital role as intermediate prey linking lower trophic levels to apex predators, supporting through top-down control in marine food webs. Their abundance serves as an indicator of productivity and overall , given their position as key forage in pelagic systems. Juveniles engage in symbiotic associations with , hovering beneath the bell or among tentacles for and protection from predators, a behavior that leverages the host's stinging defenses while juveniles develop schooling capabilities. This temporary enhances juvenile survival in predator-rich open oceans before shifting to independent adult behaviors.

Paleontology

Fossil Record

The fossil record of Stromateidae is sparse and primarily represented by the extinct genus Pinichthys Bannikov, 1985, known exclusively from deposits in the region. This genus spans from the Early to the early Middle , providing the only direct evidence of the family's prehistoric diversity. Three species of Pinichthys have been described. P. pulcher Bannikov, 1988, the oldest known, occurs in Lower (Rupelian stage) sediments of the Maikop Formation in the , with additional records from Rupelian deposits in and possibly . P. fractus Bannikov, 2014, is documented from early (Burdigalian stage) layers in (Apsheronskiy Peninsula) and (, ). The youngest species, P. shirvanensis Bannikov, 2021, comes from lowermost Middle (Tarkhanian, early Langhian) strata in the Northwestern (Russia) and ( region). These fossils, often preserved as articulated s, highlight the family's presence in ancient epicontinental seas of the Eastern and adjacent areas during a period of significant paleogeographic change. A notable recent find (as of July 2025) includes the first preserved in situ within a of P. shirvanensis from the Tarkhanian of the northern , offering new details on the structure and comparing it to otolith-based fossil species of stromateids. Morphologically, Pinichthys species exhibit a deep-bodied form akin to extant stromateids, with compressed bodies, small mouths armed with tricuspid teeth, and dorsal and anal fins positioned posteriorly. However, they differ notably from modern genera (Stromateus, Peprilus, Pampus) in retaining well-developed pelvic fins into adulthood, lacking elongation of the first dorsal-fin ray, possessing fewer vertebrae (approximately 30 versus over 42 in Stromateus), and having a larger mouth with three epurals. These plesiomorphic features suggest Pinichthys represents an early divergent lineage within Stromateidae, with no direct descendants among living species, underscoring the family's evolutionary history of specialization in pelagic environments post-Oligocene.

Evolutionary Timeline

The family Stromateidae originated in the Early , approximately 33 million years ago, as evidenced by the earliest known fossils of the genus Pinichthys, including P. pulcher from deposits in the region. These fossils mark the initial appearance of the family within the suborder Stromateoidei, which itself has ancestral roots in the Eocene, with the oldest stromateoid body fossils dating to the earliest Eocene, such as Butyrumichthys henricii from Denmark's Fur Formation around 56 million years ago. Possible ancestors of Stromateidae likely resided within the broader Stromateoidei lineage, which exhibited early diversification in Eocene marine environments before the family's distinct emergence post-Eocene. Diversification of Stromateidae accelerated during the (23–5.3 million years ago), with multiple Pinichthys species appearing across and related seaways, including P. fractus in the Lower (approximately 20–15 million years ago) and P. shirvanensis in the Middle (Langhian stage, 15–13 million years ago). This period of radiation followed the Eocene-Oligocene transition and involved adaptations to coastal and neritic niches, enabling the family to exploit shallow marine habitats in temperate to subtropical regions. The fossil record indicates a spread from the Eastern and Basin to the Mediterranean, reflecting tectonic and climatic shifts that facilitated niche expansion. Since the Pliocene (5.3–2.6 million years ago), Stromateidae has maintained stability with no major extinctions documented in the fossil record, transitioning to a modern assemblage dominated by extant genera such as Pampus, Peprilus, and Stromateus. The extinction of Pinichthys by the late Miocene appears isolated, with the family persisting through Quaternary climatic fluctuations without significant lineage losses, underscoring its resilience in coastal ecosystems.

Human Interactions

Commercial Importance

The (Peprilus triacanthus), a key within the Stromateidae family, forms the primary target of commercial fisheries in the United States, particularly along the Mid-Atlantic coast. Annual U.S. landings in recent years (2019–2023) typically range from 1,000 to 3,000 metric tons, with a 2021 quota set at 6,350 metric tons to support sustainable harvesting; actual catches in that year reached 1,524 metric tons, valued at approximately $2.3 million ex-vessel. This is harvested mainly through mid-water and is utilized both as bait for larger fisheries like and , and for human consumption in fresh, frozen, or canned forms, though its small size (rarely exceeding 30 cm) often leads to processing into fillets or meal. As of 2025, the butterfish stock is not and not subject to , with the commercial quota increased to 22,894 metric tons. Globally, Stromateidae fisheries extend across the Atlantic and oceans, with significant harvests of pomfret species such as the silver pomfret (Pampus argenteus). In the , production is substantial, exemplified by approximately 40,000 metric tons landed annually from India's west coast, including 18,000 metric tons from alone, supporting regional markets for fresh and dried products, though populations in face declines due to , mechanized practices, , and . In the Atlantic, efforts focus on butterfish stocks, managed sustainably through quotas and monitoring by bodies like NOAA's Mid-Atlantic Fishery Management Council to prevent and maintain balance. Stromateidae species offer notable nutritional benefits, particularly their high omega-3 fatty acid content, which supports cardiovascular health and averages around 1.0-1.5 grams of EPA and DHA per 100 grams serving in butterfish. However, their diminutive size restricts direct consumption in some markets, where they are more commonly used in mixed products or as rather than as a standalone food .

Misidentification and Safety Concerns

One of the primary misidentification issues involving Stromateidae species arises from the substitution of escolar (Lepidocybium flavobrunneum, family Gempylidae) for true butterfish, such as those in the genus Peprilus. This fraudulent labeling occurs because escolar is cheaper and visually similar, but consumption can lead to keriorrhea, a condition characterized by oily, orange diarrhea, due to the fish's high content of indigestible wax esters that pass through the human digestive system unmetabolized. Additional confusions affect the Stromateidae , as like Odax pullus (family Odacidae), endemic to waters and commonly marketed as butterfish, are not true members of Stromateidae despite the shared name. Similarly, Psenopsis anomala (family Psenopsidae), known as Japanese butterfish, belongs to a distinct , leading to potential market mix-ups in Asian fisheries where regional naming overlaps without posing direct health risks. The U.S. (FDA) has addressed mislabeling since the early 2000s, issuing advisories following reports of gastrointestinal illnesses linked to mislabeled imports and restaurant servings; for instance, investigations in the mid-2000s revealed widespread substitution in establishments, prompting enforcement actions against improper naming. Regional market issues persist, particularly in the U.S. and , where DNA testing has uncovered substitution rates exceeding 30% for premium fish like or butterfish, exacerbating safety concerns in high-volume trade areas. To mitigate risks, regulatory agencies like the FDA mandate that cannot be labeled or sold interstate as butterfish, white , or similar names, requiring explicit identification to inform consumers of potential adverse effects. Consumers are advised to scrutinize labels for high-fat "butterfish" alternatives, limit portions if unsure, and report suspected mislabeling, as guidelines emphasize avoiding substitutes prone to wax ester-induced issues while promoting verified Stromateidae sourcing.

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  67. https://www.mafmc.org/newsfeed/2025/june-2025-meeting-summary
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