Percoidei

There are 78 families in this suborder, making it the largest suborder in all fishes. Let's get a move-on, shall we?


centropom

Centropomidae: Snooks

There is only one genus in this family, Centropomus. They are characterized by a protruding lower jaw, forked caudal tail, and concave forehead.


ambass

Ambassidae: Asiatic Glassfishes

This family gets its name because many of the species are transparent in appearance. The Indian Glassy Fish, Parambassis ranga, is used in the pet trade, and it has been known for sellers to inject fishes with dye to give them different color. Fortunately, the pet trade is cracking down on this and it has become much less prevalent.


lates

Latidae: Lates

These fellers aren't too exciting, but some members, such as the Barramundi, make delicious food fishes. In fact, the Nile Perch (Lates niloticus) was introduced into Lake Victoria as a food source, and as a consequence has destroyed many of the natural fish populations. Sad.


moron

Moronidae: Temperate Basses

The fishes in this family are known for being good food and sport fishes, such as branzino (Dicentrarchus labrax). Members of the genus Morone are recognizable for the pattern of horizontal stripes running down their sides.


murray

Perchichthyidae: Temperate Perches

This family is mainly found in Australia, but there are also members in Asia and South America. It includes the Murray Cod (Maccullochella peelii), which is one of the largest freshwater fish species in the world.


percil

Perciliidae: Southern Basses

There is one genus, Percilia. This family is usually grouped with Perchichthyidae, but Nelson has honored them with their own family! There are only two species, which are both found in Chile (the country, not the meaty, bean-filled hearty soup).


acropoma

Acropomatidae: Lantern Bellies

This family gets its name from members of the genus Acropoma, which have light emitting organs on their bellies (light=lantern, get it!!!!). These few members of the family are notable for also having an anterior anus, which seems to mean it is located near the pelvic fin base, which is up near the throat...crazy.


symphysan

Symphysanodontidae: Slopefishes

There is only one genus, Symphysanodon. These fishes are recognizable by their elongated and deeply forked caudal fin, along with the presence of two opercular spines on each side.


saw

Polyprionidae: Wreckfishes

These l'il fellers get their name because they like to hang around shipwrecks (quite the popular resort destination for fishes). Their scientific name means "many saw," because of the spiky appearance of their dorsal fins.


hamlet
soap
giant

Serranidae: Sea Basses

Now here's a familiar family to many people! This family contains over 400 species, including the groupers! They often have a bright or noticeable appearance, along with teeth that protrude from the lower jaw. Many species are hermaphroditic, and although born females, can become male if there are no males in the area! Let's look at some interesting members of this family:


Centrogeniidae: False Scorpionfishes

There is only one species, Centrogenys vaigiensis. It looks similar to the scorpionfish in order to protect itself from predators, but it is not venomous itself. The difference is apparent when comparing the body shapes of the true and false scorpionfish.


Ostracoberycidae: Ostracoberycids

There is only one genus (Ostracoberyx). These fishes can be recognized by a long spine extending from the preopercular bone (part of the operculum, which covers the gills).


splendid

Callanthiidae: Groppos

These fishes have a FLAT nasal organ DEVOID of lamellae! That would be super exciting, if I knew exactly what it meant...they also have a lateral line which runs near the base of the dorsal fin, which is unusually high compared to other fishes.


Pseudochromidae: Dottybacks

This family is full of colorful fish species, and can be discerned from other families by the presence of three or less dorsal fin spines.


basslet

Grammatidae: Basslets

These cute guys are not to be confused with some members of Serranidae, who are occasionally called "fairy basslets." The fishes in this family have interrupted lateral lines, or lack the line entirely. They also have large pelvic fins containing one spine each.


plesio

Plesiopidae: Roundheads

They have large eyes, large mouths, and round heads (hence the name). They also have elongated spines in the pelvic fins, similar to Grammatidae.


notograpt

Notograptidae: Bearded Eelblennies

Is that an eel? No, it's a BEARDED EELBLENNY! They may look like eels, but they are not. This mistake is made because the dorsal, caudal, and anal fin are all connected. They are not eels, because they retain pectoral and pelvic fins. The "beard" is a barbel on the chin. There is only one genus (Notograptus) with two species.


jaw

Opistognathidae: Jawfishes

These fishes have large heads, eyes, and mouths. They dig burrows by filling their mouths with sand, then spitting it out elsewhere. They are mouth-brooders, with the males incubating the eggs. I guess they deserve the name "jawfishes."


dino

Dinopercidae: Cavebasses

There's not much I can say about this family. There are two species, each in their own genus (Centrarchops and Dinoperca). There is a depression in the dorsal fin between the spiny and soft regions. That's about it. I'm guessing, based on the name, that they like to chillax in caves. But I could be wrong, scientists do like to be tricky.


banjo

Banjosidae: Banjofish

There is only one species, Banjos banjos. It is interesting in that it has anal fins spines, with the 2nd spine being much longer than the others. It also has large, rounded pelvic fins.


Centrarchidae: Sunfishes

If you've ever gone fishing in New York or other parts of the U.S., you'll recognize this freshwater family. The sunfishes populate many areas of North America, and some species make great sports fishes. Besides some osteological characters, the males are noted for making depressions in the bottom with their tails, which they use to protect their eggs. One of the worst fish names goes to genus Pomoxis, better known as "crappies."" On the other side, the adorable fish Lepomis gibbosus goes by the name of "pumpkinseed." Awwwwww.


perch

Percidae: Perches

One of the largest families, this is also a familiar freshwater fish group. These fishes are usually elongated in shape, and often lack a swimbladder due to a bottom-dwelling lifestyle. This family includes the darters, which are small benthic fishes making up at least two genera (Etheostoma and Percina). There are loads of these fishes, but they're differentiated based on small characteristics or location.


bigeye

Priacanthidae: Bigeyes

These fish have (YOU GUESSED IT) big eyes. This is because they are nocturnal, and must see in the dark to hunt their prey. They are usually dark red or black.


banggai

Apogonidae: Cardinalfishes

This family also has big eyes, but not as big as Priacanthids. They have a big mouth, and their dorsal fin is completely separated into spiny and soft regions. They are often colorful, and frequently found on reefs.


deep

Epigonidae: Deepwater Cardinalfishes

These fishes are pretty similar to Apogonidae, but they live in DEEP WATER! So there.


sillangin

Sillaginidae: Sillagos

This family is made of long, skinny fishes with small terminal mouths that are prominent food fishes in the Indo-Pacific. Some species lack a swimbladder, while others have complex bladders with ducts near the anus.


tile

Malacanthidae: Tilefishes

These elongated fishes have elongated dorsal and anal fins which stretch most of the length of their bodies. The family gets its scientific name (meaning "many-thorns") from the larvae, which are covered in thorns and spines.


false

Lactariidae: False Trevally

There is only one species, Lactarius lactarius. It has a similar body shape and coloration to other powerful swimmers, like tuna or jacks. This fish is not to be mistaken for a (true) Trevally, which is a species of jack.


Dinolestidae: Long-Finned Pike

There is only one species, Dinolestes lewini. Although it has a similar body shape to barracudas (with a protruding lower jaw) it has a thicker body, with yellow colorations. It also has a longer dorsal and anal fin than the barracuda.


scombrops

Scombropidae: Gnomefishes

What kind of lawn ornament will you find underwater? A GNOMEFISH! I'm so witty! There's only one genus, Scombrops, with three species. They have disproportionately large eyes.


Pomatomidae: Bluefishes

There is only one species, Pomatomus saltatrix, and boy is he one crazy dude! The bluefish is a voracious predator, and will bite at anything with its prominent, extremely sharp teeth. When a school of them attacks a school of fish they can cause the water to violently churn, which is known as the "bluefish blitz." This fish has a long, tubular shape with a rounded head.


rooster

Nematistiidae: Roosterfishes

There is only one species, Nematistius pectoralis. It gets its name from its elaborate dorsal fin, which looks like a rooster's comb. The roosterfish is also interesting because its swimbladder passes through canals in the skull to connect to the inner ear in order to amplify sounds.


dolphin
skull

Coryphaenidae: Dolphinfishes

This is one of my favorite families! There is one genus, Coryphaena, with two species. The dorsal fin stretches the length of the body, starting at the head, and has no spines. Males have an extremely vertical sloping forehead. I thought they looked cool on the outside, but they're even cooler on the inside. The male's forehead slopes the way it does because as he matures, he GROWS A HORN! Check out the picture of a dolphinfish skull if you don't believe me! This family is not to be confused with dolphins.


cobia

Rachycentridae: Cobias

There is only one species, Rachycentron canadum. This fish has an elongate body with a tapering head. Its dorsal fin is soft, although it has a few separate spines in front of the fin. The lower jaw slightly protrudes, and the cobia almost looks like a larger version of the remora, indicative of their close relationship (see next entry).


remora

Echeneidae: Remoras

Another one of my favorite families! The remoras are super adorable, and have big lips with a protruding lower jaw. Their flattened head is home to their highly modified dorsal fin, which over millions of years of evolution has come to function as a suction cup! The remora will swim up to a larger fish or other animal and form a vacuum with its fin, allowing it to go for a free ride! The remora often pays back its host by nibbling on any parasites that may be present. It has been reported that people use remoras for turtle fishing. The fisherman ties a line to a remora, throws it in the water when a turtle is near, then reels the remora back in once it has attached to the turtle! For a super adorable video of a remora nibbling on a diver's hair, click HERE.



pilot

Carangidae: Jacks, Pompanos

This is a large family, with a very distinctive body type. Jacks can be identified by a laterally flattened body, which can be rounded or fusiform. The body tapers towards the tail, which is stiff and provides the swimming power of the fish. One notable member is the pilotfish, Naucrates ductor, which is known to swim with sharks and other large animals, eating parasites and excess food.


moon

Menidae: Moonfish

There is one species, Mene maculata. This fish is interestingly shaped, being laterally compressed with a nearly flat dorsal surface and a deeply keeled ventral surface. It has no spines in its long dorsal and anal fins, and it has elongated pelvic fins.


Leiognathidae: Ponyfishes, Slimys, Slipmouths

This family gets the name "Slimys" from the copious amounts of mucus they produce. Other interesting features include a highly protractile jaw, a locking mechanism in the dorsal and anal fins to keep the spines upright, and the presence of luminous organs in the throat, which are able to shine through the underside.


pomfret

Bramidae: Pomfrets

This family of fishes has a similar body form to jacks or dolphinfishes, depending on the genus. Their most exciitng feature is a long dorsal fin that extends the length of the dorsal surface.


mane

Caristiidae: Manefishes

This family is known for their affection for siphonophores, which they dine on incessantly. They have large eyes and long pelvic fins. They get their name from their long dorsal fin which originates on the head.


rover

Emmelichthyidae: Rovers

In this family, some of the species have their two dorsal fins connected, some do not. It has caused great rifts at their family reunions.


snap

Lutjanidae: Snappers

This large family is characterized by fishes with enlarged canines, giving them a scarier appearance than your average fish. Honestly, although they are well-known food fishes, they aren't an extremely exciting group. They are known for causing ciguatera poisoning, most likely due to being high on the food chain and concentrating poisons in their tissues. Ciguatera poisoning, for those of you that are curious, is a toxin originating from dinoflagellates, and cannot be detected in fish before its eaten. It is also unpredictable, and can cause anywhere from mild to severe symptoms depending on the incident.


fuse

Caesionidae: Fusiliers

These guys are related to snappers, but instead of being carnivorous, they feed on plankton. Isn't that nice?


triple

Lobotidae: Tripletails

There is only one genus, Lobotes, with two species. Do they actually have three tails? Nope. But they like to trick people into thinking they do, because the second dorsal and anal fins are rounded like the tail, so it's like the fish has three tails! The juveniles are even trickier, and often float near the surface, pretending that they're leaves! Tricky fishes!


mojarra

Gerreidae: Mojarras

These fishes have highly protractile mouths! I'm not sure what a Mojarra is, but it sounds pretty cool...like the name of an epic spaceship in a sci-fi movie.


grunt

Haemulidae: Grunts

These fishes get their delightful name from their delightful habit of grinding their teeth, especially when caught by fishermen. Maybe they should see an orthodontist about that problem? This family includes the French Grunt (Haemulon flavolineatum), which are familiar to snorkelers, along with the Porkfish (Anisotremus virginicus). There are also numerous brightly colored fishes, known as "sweetlips."


monocle

Nemipteridae: Threadfin Breams

This family of fishes is a group of generic percoids with not too many distinguishing characteristics. Their common name comes from some of the species, which have a long filamentous upper lobe of the caudal fin. This family includes Scolopsis bilineata, the Two-Lined Monocle Bream, which is kind of a cool name for a fish.


emperor

Lethrinidae: Emperors, Emperor Breams

Another not-too-descript family, these fishes are closely related to Nemipterids, grouped based on the lack of interesting characters. One seemingly important fact (as Nelson and Fishbase feel the need to mention it) is that there is only one species found in the Atlantic, Lethrinus atlanticus. Some species have the ability to change from female to male.


teeth
red

Sparidae: Porgies

Yet again, another family lacking defining characters...unless you count ridiculous names as a character! Let's take a look:


Centracanthidae: Picarel Porgies

This family is notable for its extremely protractile upper jaw. Fascinating.


thread

Polynemidae: Threadfins

These fishes get their name from their distinctive pectoral fins. The fins are separated into two sections, with the upper section looking like a normal fin. However, the lower section is made up of about 7 elongated rays which are entirely separate from each other.


drum
spot

Sciaenidae: Drums

This is a huge family, including over 250 species, which come in different shapes and sizes. Drums get their name from their elaborate swimbladders, which they use to produce sounds by vibrating the swimbladders with the surrounding muscles. They also have large otoliths (ear bones), most likely to hear the drumming of other members of their species. Some species have barbels on the chin, and many species often have conspicuous pores around the nose and mouth. Some notable members:


goat

Mullidae: Goatfishes

Goatfishes have a pair of barbels on their chins, which they use for finding food. Just like goats, they are not picky eaters, and will eat whatever they can find on the seafloor. Goatfishes are known to be able to change colors.


sweep

Pempheridae: Sweepers

Sweepers have very large eyes, and a flattened body that is deepened ventrally, similar to a hatchetfish. They also have a small dorsal fin near the head. They are nocturnal, which explains the large eyes (the better to see you with, my dear!)


pearl

Glaucosomatidae: Pearl Perches

There is one genus, Glaucosoma, which is not to be confused with the disease Glaucoma. They are closely related to sweepers, and that's all I have for you.


beach

Leptobramidae: Beachsalmon

There is one species of beachsalmon, Leptobrama muelleri. It has a fusiform shape, and is laterally compressed. The mouth extends past the smallish eye, and the dorsal/anal fins are located midway on the body.


Bathyclupeidae: Bathyclupeids

This deepsea family has one genus, Bathyclupea, with five species. They can be recognized by the presence of a short spineless dorsal fin about halfway on the dorsal surface.


moony

Monodactylidae: Moonyfishes

These fishes have very deep bodies, and can be taller than they are long. The adults lack pelvic fins, although the juveniles may have them.


archer

Toxotidae: Archerfishes

There is only one genus, Toxotes, and boy is it an awesome one! Archerfishes get their name from their ability to forcibly squirt water from their mouths, to accurately hit insects sitting on foliage above the water. They are extremely accurate, and almost always hit their prey on the first try. They are laterally compressed, with a deep body, large eyes, and a jutting lower jaw.


salmon

Arripidae: Australasian Salmon

There is one genus, Arripis. This family was named by European explorers when they came to Australia based on a similar appearance to salmon, but they are obviously not related (based on their placement on this website). They can be identified as not-salmon by the forward placement of the pelvic fins, along with the spiny dorsal fin, which stretches the length of the dorsal surface.


galjoen

Dichistiidae: Galjoen Fishes

There is one genus, Dichistius, with two species. It looks similar to the Centrarchid body type, but it is not a Centrarchid! So remember that. They have a large maxilla, which kind of makes their mouths look goofy.


chub

Kyphosidae: Sea Chubs

Sea chubs are super goofy! I've seen them whie snorkeling and scuba diving, and they like to swim nearby in large schools. They just have a goofy look about them, as if they're not really sure what's going on. They usually have a roundish body when viewed from the side, and have a dorsal fin that stretches the length of the back.


sickle

Drepaneidae: Sicklefishes

What does the Grim Reaper order at a seafood restaurant? SICKLEFISH! Sometimes I just crack myself up. There is one genus, Drepane, with two species. These fishes have a deep body with a pointed back, and they have extremely long pectoral fins.


butterfly

Chaetodontidae: Butterflyfishes

This family is full of brightly colored fishes! Once thought to be related to Angelfishes (see below), they were finally separated into different families. Many species have eye spots on the posterior region to confuse predators. Internally, the swimbladder has two anterior processes, possibly to amplify sound towards the inner ear.


angel

Pomacanthidae: Angelfishes

You may be asking after the previous entry, "But Nate, what's the difference between angel- and butterfly-fishes?" Well, I was saving it for this entry! Angelfishes are easily identifiable by a sharp spine on their operculum (bony gill covering). That's how you know! They are also brightly colored, although do not usually have eyespots.


wife

Enoplosidae: Oldwife

There is one species, Enoplosus armatus. They may look like butterflyfishes, but they are not! They can be distinguished by extremely large pelvic fins, each containing a spine. There are also two large dorsal fins with spines, which some say can inflict a venomous wound. In addition, there is, not one, but TWO opercular spines (smaller than in angelfishes).


armor

Pentacerotidae: Armorheads

Based on the name, I'm going to guess they have armored heads...which they do! The head region is covered by exposed bone. The dorsal fin has large spines in the anterior portion.


nandus

Nandidae: Asian Leaffishes

These fishes like to float along, pretending they're leaves. This way, using their large mouths, they can ambush large prey. They have a continuous dorsal fin, and a spiny anal fin.


polycent

Polycentridae: Afro-American Leaffishes

These should actually be called "South American Leaffishes," as it seems the families have been revised since Nelson 2006 was published. There are two monotypic genera, and they are both only found in South America. They are similar in description to Nandidae.


tiger

Terapontidae: Grunters, Tigerperches

This family has spiny fins all over, with the dorsal, anal, and pelvic fins containing spines. The tigerperches also have an interesting swimbladder situation, with it being transversely divided and having unique strumming muscles.


Kuhliidae: Flagtails

There is only one genus, Kuhlia. The genus is distinguished by fin sheathes for the dorsal and anal fins, which protect the fins when they are not erect.


knife

Oplegnathidae: Knifejaws

There is one genus, Oplegnathus. The adults of this family have a fused beak, similar to parrotfishes.


hawk

Cirrhitidae: Hawkfishes

This family has spiny dorsal fins, with each spine tipped with filaments ("Cirrh-"" is greek for fringe). They do look similar to scorpionfishes, although they are not closely related. They often perch in fire coral for protection from predators.


kelp

Chironemidae: Kelpfishes

There's not much to say about this family. They look similar to hawkfishes, but kind of have a lumpy head. And maybe they like kelp. Or eat kelp. Or live in kelp. I don't know.


marble

Aplodactylidae: Marblefishes

There is only one genus, Aplodactylus. Their scientific name means "single finger," because of the simple shape of their pectoral fins.


morwong

Cheilodactylidae: Morwongs

These fishes have long dorsal fins with many spines, and big lips. I have no idea what a morwong is, but it sounds like an ancient form of martial arts.


trumpet

Latridae: Trumpeters

This family has a long dorsal fin, almost divided between the spiny and soft regions. Supposedly they are good sport fishes. They are similar to Cheilodactylids.


band
teeth

Cepolidae: Bandfishes

This family is a little different than other Percoids. The dorsal fin extends almost the entire length of the body, and the lateral line runs near the base of this fin. Many species have a dorsal fin that connects to the caudal and anal fin, similar to that of an eel.