Pacific snook with a blue-tinged back and silvery flanks, a dark lateral line and the black final third of the pelvic fins. Lives in bays, estuaries and the lower reaches of rivers, from the Gulf of California to Ecuador.
Eastern Pacific snook: found from the southwest of Baja California Sur and the central Gulf of California to Ecuador (STRI extends it to northern Peru). Lives in bays, estuaries and the lower reaches of rivers; FishBase records adults in fresh water at 250 m of elevation and about 20 km from the coast, but it is most abundant in estuaries and also appears in coastal water. Eats fish and crustaceans, mainly shrimp and crabs. It reaches 65 cm and 3.2 kg; the IGFA world record, 3.2 kg, is from Costa Rica, 2002, according to a Mexican fish guide. In Mexico it is a small, uncommon snook that shows up in Los Cabos markets, where its white flesh is much prized.
fun facts
According to the Mexican guide consulted, in Los Cabos the small snooks of the genus are called paletas.
According to FishBase, there are adults in fresh water at 250 m of elevation and about 20 km from the coast.
how to recognize it
identification
Elongated, flattened-sided body, silvery, with a bluish or gray back and a dark lateral line. The outer third of the pelvic fin is usually black, and the membrane between the second and third anal spines is dark. Bent back, the second anal spine does not reach the base of the tail, and the pectoral fins are shorter than the pelvic fins; the anal fin has 7 rays. The armed snook and the yellowfin snook have a much thicker and longer second anal spine that reaches the tail; in the black snook and the white snook of the Pacific, the third dorsal spine is much longer than the first and second.
how blackfin snook fishing looks
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Each card shows the day's index (0 to 100) and, below it, a strip with the index for each hour, from 0h to 23h. from poor to excellent.
Not found in Brazil. Eastern Pacific, from the southwest of Baja California Sur and the central Gulf of California (Mexico) to Ecuador, according to FishBase; STRI extends it to northern Peru. In Mexico it ranges from Bahía Magdalena and the southern gulf along the mainland coast to Guatemala, and is more abundant in the southern part of that range. FishBase lists Mexico, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panama, Colombia and Ecuador.
Habitat: Bays, estuaries and lower stretches of coastal rivers, including where dry river beds meet the sea; also in shallow coastal water.
calendar and clock
when to fish
best season
time of yearbest: Jun–Oct
JanFebSeaAprMayJunJulAugSepOctNovDec
No seasonal study for this species. The app gives more weight to warmer water and to rivers with higher flow, from June to October, when fresh water reaches the river mouths.
best time of day
Dawn and dusk. No dedicated study. The app's estimate follows the snooks: more activity at dawn, dusk and at night, during tide changes.
weather, water and behavior
what affects the blackfin snook
sensitivity The little bars show how much each factor affects this species. Five full: it feels it a lot.
cold and cold fronts
Cold winter water reduces activity in the bays and at river mouths.
atmospheric pressure
Stable pressure helps; a front with strong wind shuts down fishing.
moon
Full-moon and new-moon tides move water at the mouths and in the channels.
rain
A rising, muddy river scatters the fish; clearing water afterwards is good.
water level
Falling river concentrates snook at mouths and channels.
noise
Sensitive to noise and to shadow on the water; arrive by oar or electric motor.
wind
Strong wind makes precise casting near roots and logs difficult.
tide
Ebb tide at river and lagoon mouths is usually the best.
depth
From 0.5 to 5 m, near logs, roots and current breaks.
single hook no. 2 to 1/0; circle hook 1/0 to 2/0 on live bait
lures
mid-water jerkbait, 7 to 10 cm
silicone shad on a light jig head
small stickbait at dawn
streamer for fly fishing
natural baits
live shrimp
small live or dead baitfish
accessories
alicate
small boga-grip
polarized glasses
tip from an angler
Cast tight to the roots and along the edge of the channel and retrieve with pauses: the snook hits the bait that comes out of the shade carried by the current.
what the law says
rules for the blackfin snook
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency. Conservation: Of least concern globally. Not listed in Mexico's NOM-059-SEMARNAT-2010. According to the 2021 fisheries management plan for Nayarit and southern Sinaloa, the snooks of the Mexican Pacific have no closed season or minimum size of their own.
Mexico: up to 5 per species and 10 saltwater fish per day
5 specimens of the species per angler per day, within the limit of 10 saltwater fish
In recreational sport fishing in Mexican federal waters, each angler may keep up to 10 marine fish per day, no more than 5 of the same species. The black-finned snook is not among the species reserved for sport fishing (marlin, sailfish, swordfish, "sábalo o chiro," roosterfish and dorado, up to 50 nautical miles from shore, item 0.3 of the standard) and has no quota of its own. Fish over the limit go back alive (item 4.9.5), and sport-caught fish may not be sold. Anglers fishing from a boat need the permits of the Federal Duties Law; anglers fishing from shore do not (item 4.3).
Personal Incopesca license, for people over 16confirm with the agency
In the regulation of the Fisheries and Aquaculture Law (Decree 36782, of May 24, 2011), art. 69, sport fishing is authorized only for natural persons over 16, with a license issued by Incopesca; tourists, whether national or foreign, also need the license. Art. 68 limits the landing of large pelagics to 5 per trip, and art. 66 promotes catch and release, but the rule sets no quota for this species. The decree was later amended (Decree 39458), so confirm the current rule with Incopesca.
Panama: new sport fishing decree in force from Dec 10, 2026
Executive Decree No. 9 (Jun 10, 2026), in force from Dec 10, 2026confirm with the agency
ARAP published Executive Decrees No. 9 and No. 10, of Jun 10, 2026, in the Official Gazette. The first regulates sport fishing throughout the territory; the second protects billfish (sailfish and marlins). Both take effect on Dec 10, 2026, after six months of adaptation. We did not verify the text: the press report gives no catch limits, sizes or license requirements. Before fishing in Panama, check with ARAP.
Colombia: AUNAP license and catch-and-release in sport fishing
Individual AUNAP license; catch-and-release guidanceconfirm with the agency
AUNAP Resolution 0549 of 2022 sets the guidelines for sport fishing for recreational purposes in Colombia. Anyone fishing needs a permit: for a natural person, Colombian or foreign, it is a personal, non-transferable license (art. 6). The rule uses "capture and release" as guidance. We did not verify the daily limit or the minimum sizes by species: check with AUNAP before keeping any fish.
catch and release Releasing the fish alive, quickly and with a wet hand. During a closed season it isn't always allowed: what the regulation says applies.
Hold it by the mouth with a wet hand, support the belly, and watch the sharp edge of the gill cover and the anal spines. Release it facing the current, only once it swims on its own.
in the kitchen
White, firm flesh, considered excellent; fried, baked or in ceviche.
calculator
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.00724, b = 3.05; FishBase (relação peso-comprimento bayesiana, estimativa da própria espécie)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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sources and references
The season weights (months), time of day and sensitivities (cold, pressure, moon, wind, rain, tide, strong light, murky water and noise) are the app's editorial estimates, based on the literature below and on field experience of anglers and guides. They are not official data or measurements made for this species, and may vary by region and year. Closed seasons and legal rules appear in the rules section, with the standard and a link. The common size starts from FishBase's common length (30 cm), and the common weight is calculated from the length-weight relationship.
technicalMexican Fish (mexican-fish.com): ficha do Blackfin Snook (Centropomus medius)Independent guide to Mexican Pacific fishes, with photos of catches and the author's observations; not an official source. Page checked on 13/10/2026. It gives the distribution in Mexico, the IGFA record of 3.2 kg (Costa Rica, 2002) and how to tell it apart from the black snook and the white snook.
