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Black rockfish
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Black rockfish
At the Vancouver Aquarium
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Scorpaenidae
Genus: Sebastes
Species:
S. melanops
Binomial name
Sebastes melanops
Girard, 1856
Synonyms[1][2]
  • Sebastodes melanops (Girard, 1856)
  • Sebastosomus simulans Gill, 1864
  • Sebastodes columbianus Hubbs & Schultz, 1933

The black rockfish (Sebastes melanops), also known variously as the black seaperch, black bass, black rock cod, sea bass, black snapper and Pacific Ocean perch,[3] is a species of marine ray-finned fish belonging to the subfamily Sebastinae, the rockfishes, part of the family Scorpaenidae. It is sometimes misidentified as the "red snapper".[3]

Taxonomy

[edit]

The black rockfish was first formally described in 1856 by the French biologist Charles Frederic Girard with the type locality given as Cape Flattery, Washington, and Astoria, Oregon.[2] In 1864 Theodore Gill described a new species Sebastosomus simulans from Cape Flattery and none of Girard's specimens can be traced to that locality. S. simulans has been regarded as a synonym of Sebastes melanops but there are enough differences between Gill's type and specimens of black rockfish to suggest that it is a different taxon but more study is needed to identify which taxon.[4] Some authorities classify this species in the subgenus Sebastosomus. The specific name melanops is a compound of melanos meaning "black" and ops which means "appearance", presumed to be a reference to the blackish brown back with black spotted brownish flanks.[5]

Distribution

[edit]

The black rockfish is found in the northeastern Pacific Ocean from Amchitka Island in the Aleutian Islands of Alaska to Santa Monica Bay in California.[6] There have been two records of this species from the Iwate Prefecture of northern Japan.[4]

Habitat

[edit]

This species is found in the waters of the continental shelf[7] and is associated with reefs at depths down to 366 m (1,201 ft) but it is more typically found between 182 and 274 m (597 and 899 ft)[1] They frequent areas of rocky reefs and live among kelp, as well as jetties and other structures.[8]

Description

[edit]
At the Monterey Bay Aquarium
In Washington

The black rockfish attains a maximum total length of 63 cm (25 in) and has a maximum published weight of 4.8 kg (11 lb).[1] It has a fusiform body which is deep and laterally compressed.[6] The head is weakly spined with only the nasal spines always present while the preocular and postocular spines are normally absent and the supraocular, tympanic, coronal, parietal and nuchal spines are always absent.[1] The head eyes are moderately large eyes with a bulge in the intraorbital space and the upper jaw reaches to the posterior margin of the eye. They have a continuous dorsal fin which contains 13-14 spines and 13-16 soft rays. The membranes between the spines are deelply incised. The anal fin has a rounded posterior profile and contains 3 spines and 7-9 soft rays. The caudal fin is truncate to emarginate.[6]

The overall color is mottled grey and black with a black spot on the posterior of the spiny dorsal fin which fades as the fish grows. Adults can have dark stripes on the head running from the eye over the operculum. The dark color on the upper body is frequently paler than that on the flanks, leading to a mottled appearance. This dark color fades to white on the underside.[9]

Biology

[edit]
Juvenile, in California

Black rockfish are pelagic, that is, they occur on the continental shelf. Like other pelagic fish, they spend most of their time amid the water columns and are generally associated with rougher terra. This can make it somewhat inconvenient for commercial fisheries, which are often situated in nearshore, shallow water, and rocky areas (reefs). They make up an important component of nearshore fisheries in Southeastern Alaska.[7]

Rockfish are slow-growing and extremely long-lived, and black rockfish become sexually mature only after 6 to 8 years of age. Specimen collected off Alaska have been aged to 49 years old. In addition they benefit from a low natural mortality rate, at only about 7% of the total population.[7]

Black rockfish breed via internal fertilization, meaning that female members of the species store sperm until the development of the eggs. The phases between the start of the process and the end are separated by several months. The majority of the young are reared in late winter to early spring. Females produce between 125,000 and 1,200,000 eggs every breeding season. However, it has been noted that not all of the eggs are released every year. It has been occasionally observed that the female may absorb the eggs back into her system.[7]

Tagging studies off Washington, Oregon, and Southeast Alaska indicate that although for the most part they spend most of their life in a small area, some long-distance travel does occur.[7]

A potential PCR-RFLP genetic sex marker developed for gopher rockfish[10] does not successfully distinguish male and female black rockfish.[11]

Fisheries

[edit]
Black and widow rockfish catch, in Alaska

The black rockfish is a prime target for anglers, and a reproductive rate unusually high for its slow-growing genus makes it more resistant to fishing than its cousins, such as the yelloweye rockfish, are. They are harvested in Oregon, California, Washington, British Columbia, Alaska, and the Pacific. They are a fairly common catch along the West Coast of North America, where populations are stable.[3]

Schools of adults often aggregate over rocky bottoms or at the sea surface, habits that make them susceptible to targeted fishing.[7]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Black rockfish

View on Grokipedia
from Grokipedia
The black rockfish ( melanops) is a marine ray-finned in the , commonly known as rockfishes, characterized by a robust, bass-shaped body with a mottled gray-black coloration dorsally and a lighter white belly ventrally. Adults typically reach a maximum of 63–69 cm and weight of up to 4.8–5 kg, with females growing larger than males, and they possess 13–14 dorsal spines, a large , and mildly venomous spines that can cause minor pain upon contact. This species inhabits coastal waters of the northeastern , ranging from the in to , , and is noted for its schooling behavior, particularly among juveniles which are pelagic before settling. Black rockfish exhibit a biphasic life history, with larvae released live (viviparous reproduction) in spring after internal development in the female's ovaries, followed by a 1–2 month pelagic phase before juveniles settle into nearshore habitats such as eelgrass beds, kelp forests, and cobble fields. Adults prefer high-relief rocky reefs and can be found from surface waters to depths of 366 m, though they are most abundant in shallower areas less than 55–73 m. The species is long-lived, with a maximum age of about 50 years and maturity reached at 30–42 cm in length, and fecundity increases with age, though overall reproductive success is low and influenced by maternal effects on larval survival. Ecologically, black rockfish are reef-associated predators that form schools over rocky bottoms or open water above deep banks, feeding primarily on small fishes like and surfperch, as well as crustaceans such as crabs and shrimp, and benthic invertebrates including amphipods. They play a key role in nearshore marine ecosystems, serving as prey for larger predators, and are managed as distinct stocks in regions like due to varying abundance and habitat preferences between northern and southern populations. Economically, black rockfish support recreational and minor commercial fisheries across their range, valued for sport fishing, though populations in some areas like are classified as precautionary due to historical and slow recovery rates linked to their life history traits.

Taxonomy

Classification

The black rockfish is classified under the binomial name melanops, originally described by the French-American ichthyologist Charles Frédéric Girard in 1856 based on specimens from the northeastern Pacific coast. The type locality for the species includes in Washington and the vicinity of , near the mouth of the . It belongs to the family , commonly known as scorpionfishes and rockfishes, a group characterized by robust bodies and spiny fins adapted to temperate marine environments. Within this family, S. melanops is placed in the genus , which encompasses over 100 species of viviparous rockfishes primarily distributed across the North Pacific Ocean. Historically, Sebastosomus simulans (described by Theodore Nicholas Gill in 1864) has been treated as a junior synonym of S. melanops, but the original description of the holotype indicates morphological differences, such as fewer pectoral-fin rays (18 versus typically 19 in S. melanops) and a shorter upper jaw, suggesting it may represent a distinct species pending further study including examination of the holotype and genetic analyses. Phylogenetic analyses position S. melanops within a diverse subclade of Sebastes species exhibiting similar reproductive and ecological traits in coastal waters.

Etymology and Synonyms

The genus name Sebastes derives from the Greek sebastos, meaning "august" or "venerable," a reference to the dignified appearance of these fish. The specific epithet melanops combines the Greek words melas (black) and ops (face or eye), alluding to the species' dark coloration around the head. This nomenclature reflects the fish's distinctive visual traits within the family . The black rockfish was first formally described in 1856 by Charles Frédéric Girard in the Proceedings of the Academy of Natural Sciences of , based on specimens from the of . Over time, taxonomic revisions have clarified its , with historical synonyms including Sebastodes melanops (Girard, 1856) and Sebastosomus simulans (Gill, 1864), which were once considered separate but later synonymized under Sebastes melanops. Additional junior synonyms, such as Sebastes columbianus (Hubbs and Schultz, 1933), emerged from early morphological studies but were resolved through comparative examinations of type specimens. In early 20th-century , particularly in works by and Barton Warren Evermann, debates arose over subgeneric divisions within Sebastes, including whether species like the black rockfish belonged to subgenera such as Sebastodes due to variations in spine counts and body proportions; these discussions ultimately reinforced the current unified placement. Common names for the species include black rockfish (the standard vernacular), black seaperch, black bass, and , reflecting regional fishing traditions along the North American Pacific coast.

Description

External Morphology

The black rockfish (Sebastes melanops) exhibits a robust, body that is compressed laterally, giving it a streamlined yet sturdy appearance typical of the . The body is covered in small ctenoid scales, with a featuring 46-55 pores that aid in sensory detection. Adult coloration is predominantly mottled gray-black dorsally, often accented by dark stripes running from the eye to the gill plate, transitioning to a lighter, dirty white or whitish ventral surface. A diagnostic black spot marks the posterior portion of the spinous , which fades as the fish ages. The fins are generally dark, with the pelvic fins lighter in contrast. The head is equipped with a large , where the extends to or beyond the posterior margin of the , facilitating prey capture, and moderately large eyes. Head spines are weak to very weak, lacking prominent structures such as a strong symphyseal knob on the lower jaw. Diagnostic fin structures include a continuous with 13-14 sharp spines followed by 13-16 soft rays, where the spines are venomous and capable of inflicting painful stings or infections upon contact. The anal fin bears 3 spines and 7-9 soft rays, presenting a rounded or posteriorly slanted profile, while the caudal fin features an indented posterior margin. Juveniles display brighter, more vivid coloration upon settlement, ranging from orange to , with older juveniles adopting the mottled gray-black but retaining more pronounced spots and bars that gradually fade. manifests primarily in body size, with females achieving slightly larger dimensions than males, up to a maximum of approximately 69 cm.

Size and Growth Patterns

The black rockfish ( melanops) attains a maximum total length of 69 cm and a maximum weight of 5 kg. These dimensions represent the upper limits observed across populations, with females typically achieving larger sizes than males. Black rockfish exhibit slow growth, particularly in early life stages. Juveniles, which recruit to nearshore habitats at approximately 3.5–9.3 cm standard length after about six months of pelagic existence, reach 10–15 cm total length by the end of their first year under typical environmental conditions. Growth rates vary with temperature and food availability, ranging from -0.023 to 0.314 mm per day in length for juveniles of 35–93 mm, with optimal growth at higher rations and moderate temperatures around 12–18°C. By maturity, individuals approach an asymptotic length of around 50 cm, though regional studies indicate slight variations. The species has a lifespan of up to 50 years, with maximum observed ages of 48–56 years depending on the population. Age determination relies on annuli counts in otoliths, using methods such as break-and-burn, which yield low error rates (average 1%) and validate growth trajectories through back-calculation. Growth patterns are commonly modeled using the , which describes length-at-age as
L(t)=L∞[1−exp⁡(−K(t−t0))],L(t) = L_{\infty} \left[1 - \exp\left(-K(t - t_0)\right)\right],
where L(t)L(t) is length at age tt, L∞L_{\infty} is the asymptotic length, KK is the growth coefficient, and t0t_0 is the hypothetical age at zero length. For coastal populations in , , and Washington, sex-specific parameters include L∞≈55L_{\infty} \approx 55 cm and K≈0.1K \approx 0.1–0.2 year−1^{-1} for females (e.g., L∞=54.5L_{\infty} = 54.5 cm, K=0.15K = 0.15 year−1^{-1}) and slightly lower L∞L_{\infty} (46–51 cm) with higher KK (0.21–0.27 year−1^{-1}) for males, reflecting faster initial growth but smaller ultimate size in males. These parameters are derived from otolith-based age-length data and fit regional variations, emphasizing the species' over decades.

Distribution and Habitat

Geographic Range

The black rockfish (Sebastes melanops) inhabits the northeastern , with its primary range extending from Amchitka Island in the of southward to in , and further to northern , . This distribution spans coastal and shelf waters along the North American continent, where the species is endemic to the region. The species is most abundant north of , particularly along the coasts of , Washington, and , with populations decreasing in density southward toward its latitudinal limits of approximately 55°N to 30°N. It occupies a depth-integrated range from the surface waters down to 366 m, allowing for both pelagic and benthic occurrences. Rare vagrant records exist from in northern , likely resulting from larval drift , based on two specimens collected in 2012. As of 2025, black rockfish are considered highly vulnerable to in the , showing elevated growth but delayed maturation during intense , which may influence future distribution patterns. Ongoing monitoring is essential to detect potential alterations due to climate-driven changes in conditions.

Habitat Preferences

Black rockfish (Sebastes melanops) inhabit temperate coastal waters of the North Pacific, primarily along rocky substrates from shallow nearshore areas to deeper offshore banks. They occur from the surface to depths of 366 m, though they are most commonly found at depths of 0-73 m, where they associate with high-relief rocky reefs and beds. Adults exhibit semi-pelagic behavior, often aggregating near the surface or bottom in open water over deep banks, as well as around jetties and artificial structures. These fish prefer water temperatures of 8–15°C, characteristic of -influenced coastal regions that enhance productivity, and they demonstrate tolerance to periods of low dissolved oxygen associated with such events. Juveniles settle in shallower habitats, typically 0–30 m deep, favoring protected forests, eelgrass beds, and anthropogenic features like pilings and jetties in nearshore and estuarine environments. Ontogenetic habitat shifts are pronounced in black rockfish: larvae remain pelagic for several months before settling into nearshore shallows, while juveniles occupy intertidal and estuarine shallows before migrating to more offshore, deeper adult habitats as they mature.

Biology

Reproduction

Black rockfish (Sebastes melanops) exhibit viviparity, a reproductive strategy characteristic of the genus Sebastes, involving internal fertilization within the female's oviduct followed by the retention of developing embryos until live birth. Males mate with females from September to November, depositing sperm that females store for several months prior to fertilization, which occurs between December and January. This delayed fertilization allows for precise timing of embryonic development aligned with favorable environmental conditions. Parturition, or the extrusion of live young, takes place from mid-January to mid-March, peaking in , with older females tending to give birth earlier in the season. The period following fertilization lasts 1 to 2 months, varying with water temperature, during which females nourish the embryos internally. is moderate to high, with females producing 299,000 to 948,000 fertilized embryos per reproductive cycle, increasing with maternal age and size; relative ranges from 374 to 549 embryos per gram of female body weight. Sexual maturity is reached by males at approximately 6 to 7 years of age and 36 cm fork length, slightly earlier than females, which mature at 7.5 years and 39 cm fork length on average. Reproductive output benefits from the species' long lifespan, as older females (>10 years) exhibit higher and produce larvae of superior quality, with larger reserves enhancing early . Upon birth, black rockfish larvae are pelagic and well-developed, measuring about 5 in length with a yolk sac remnant enabling immediate exogenous feeding. The larval stage lasts 3 to 6 months (83 to 174 days), during which individuals disperse from natal areas, though evidence indicates limited dispersal distances, typically less than 120 km, due to behavioral and oceanographic factors. This pelagic phase ends with settlement to nearshore habitats, completing the reproductive cycle.

Diet and Feeding

Juvenile black rockfish (Sebastes melanops) are primarily planktivorous during their pelagic phase, consuming copepods (such as calanoid and harpacticoid species), gammarid amphipods, and zoea larvae. Adults exhibit a carnivorous diet, preying on smaller (including juvenile rockfish and other small species), benthic crustaceans such as , (including megalopae), mysids, and amphipods, as well as euphausiids, , and polychaetes. Black rockfish act as opportunistic mid-water predators, employing tactics while often aggregating in schools to over reefs; their daily ration is estimated at 2–4% of body weight based on gastric evacuation analyses. The species maintains a of approximately 4.0, positioning it as a mid-level predator, with seasonal dietary shifts driven by prey availability—such as increased consumption and variety in late summer and early fall.

Behavior and Ecology

Black rockfish (Sebastes melanops) exhibit schooling behavior, forming large mid-water aggregations that can number in the thousands, often over rocky reefs or beds in coastal waters. These schools facilitate foraging and predator avoidance in their semi-pelagic lifestyle, with individuals typically occupying depths of 10 to 120 meters. The species displays strong , with limited migration and average dispersal distances of approximately 12 to 19 kilometers, reflecting site fidelity to natal areas throughout their long lifespan. Predators of adult black rockfish include larger piscivores such as (Ophiodon elongatus), other species (Sebastes spp.), sharks, and marine mammals like sea lions (Zalophus californianus). As a defense mechanism, their dorsal and anal spines are mildly venomous, capable of inflicting painful wounds or infections upon contact, though the toxin is not highly potent. This structural adaptation, combined with schooling, enhances survival by deterring close-range attacks from predators. In marine ecosystems, black rockfish serve as key prey for upper trophic levels, supporting predators like seabirds, marine mammals, and larger fishes, thereby linking mid-trophic production to higher consumers. Their sensitivity to —due to slow growth, late maturity, and low natural mortality—positions them as indicators of and coastal , where population declines signal broader pressures like habitat degradation or unsustainable harvest. Recent assessments highlight their vulnerability, emphasizing the need for monitoring to maintain trophic balance. Black rockfish respond to environmental cues by aggregating in mid-water during coastal upwelling events, which bring nutrient-rich waters to the surface and boost plankton productivity, enhancing opportunities. Studies from 2021 indicate that ocean warming and are driving vertical distribution shifts in some rocky reef assemblages, with species moving to shallower depths; black rockfish show sensitivity to hypoxia in laboratory conditions. A 2023 study on larval stages highlights impacts on growth from anomalous ocean conditions. These behavioral adjustments reflect adaptations to climate-driven alterations in structure, potentially affecting school dynamics and prey availability. As of 2025, research on marine heatwaves shows black rockfish exhibit faster growth but delayed maturation, leading to lower and higher ovarian parasite loads during intense events.

Fisheries and Conservation

Commercial and Recreational Use

Black rockfish are primarily harvested commercially using hook-and-line gear over rocky reefs and bottom trawls in nearshore waters along the U.S. West Coast. These methods target aggregations in shallow to moderate depths, with hook-and-line dominating recent catches due to trawl restrictions in sensitive habitats. Landings peaked in the 1980s at approximately 1,500–2,000 metric tons annually across California, Oregon, and Washington, driven by expanded jig and trawl fisheries. In recent years, commercial landings have stabilized at lower levels, around 100–200 metric tons per year as of 2023, reflecting shifts to sustainable practices and quota allocations. Byproducts include fresh and frozen fillets, which are marketed for their mild flavor and firm texture, contributing to the species' economic value in regional markets. A minor portion enters the aquarium trade, though this is limited due to the fish's size and needs. Recreational fishing for black rockfish is popular along the West Coast, often involving or bait fishing from boats near reefs and beds. Anglers target them for and , with daily bag limits such as 10 fish in and varying limits in (e.g., 4–10 fish depending on season and area as of 2025). This fishery supports coastal tourism and local economies, with catches complementing commercial harvests. Historical trends show in the 1980s and 1990s from intense pressure, leading to subsequent restrictions that reduced landings and allowed stock recovery. The 2025–2026 harvest specifications maintain balanced exploitation amid healthy population levels, though with precautionary reductions in some areas like .

Population Status and Management

The black rockfish (Sebastes melanops) stock off was assessed in 2023 at approximately 38% of unfished spawning output, a level near the target threshold of 40% and indicative of stability following recovery from historical declines. In , the stock is considered healthy based on recent evaluations, with the 2025 fishery-independent survey providing data on that supports sustainable harvest levels despite a precautionary quota reduction. The species does not carry an overfished designation under U.S. federal management. Key threats to black rockfish populations include historical and in trawl and hook-and-line fisheries, which have contributed to past depletions. exacerbates vulnerabilities through altered patterns that disrupt larval transport and survival, as well as marine heatwaves delaying maturation; studies from 2022 to 2025 project potential range contractions in response to warming oceans and reduced suitability. Management is overseen by the Pacific Fishery Management Council, which sets quotas via annual catch limits derived from stock assessments to prevent . Amendment 31, approved in 2023, delineates distinct units for black rockfish along the U.S. West Coast to enable more precise, region-specific regulations. Fishery-independent surveys, including those conducted in 2021 and 2025, are critical for ongoing monitoring of abundance, recruitment, and distribution. Conservation efforts benefit from marine protected areas, such as the National Marine Sanctuary network, where no-take zones have facilitated recovery by enhancing biomass and spillover to adjacent fished areas. The IUCN Red List assesses S. melanops as , reflecting a lack of comprehensive global threat evaluation but underscoring the importance of regional protections.

Fisheries in Alaska and Canada

In Alaska, black rockfish support a directed commercial jig fishery primarily in , with annual harvests typically ranging from 10–50 metric tons, managed by the Alaska Department of Fish and Game (ADF&G) through guideline harvest levels to ensure sustainability. Recreational fishing is also popular, particularly in areas like Kodiak and , with bag limits of 5 fish per day. Populations in Alaska are considered healthy, with no overfished status. In , , black rockfish are harvested in the inshore commercial using hook-and-line gear, contributing to overall rockfish landings under (DFO) management, which includes individual vessel quotas and Rockfish Conservation Areas to protect habitat and rebuilding stocks. Recreational bag limits are 8 rockfish per day, including black rockfish. Conservation measures, such as no-take areas established since 2007, have aided recovery, and the species is assessed as stable in regional evaluations.

References

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