Marine

Sharks

Like all fish, sharks are vertebrates, but ichthyologists separate them from most bony fish because a …

Sharks, Hammerhead

Sphyrna species

Hammerheads are easy to identify, even for the beginner: the eyes are located at the ends …

Sharks, Sharpnose

Rhizoprionodon species

It has a characteristic long and flattened snout and a slender brown to olive-gray body with …

Sharks, Thresher

Alopias species

Known by various names, the thresher shark is distinguished by its well-branched tail, whose upper blade …

Sharpnose sevengill shark

Heptranchias perlo

These sharks have a slender, spindly body with a narrow, pointed head. The large oval eyes …

Sheephead, California

Semicossyphus pulcher

The body is elongated, strong and compressed. This species is hermaphroditic: it begins life as a …

Sheepshead

Archosargus probatocephalus

The body is comparatively short and high. Head is high. Mouth almost horizontal, small or medium-sized, …

Shi drum

Umbrina cirrosa

Body elongated, high, slightly compressed at the sides. Muzzle short and blunt. Small mouth with fine …

Short-finned eel

Anguilla australis

The body is long, snake-like, tubular, the head is small, and the jaws reach from behind …

Short-finned pilot whale

Globicephala macrorhynchus

The short-finned pilot whale is very different in appearance from the long-finned pilot whale. They have …

Short-tail stingray

Bathytoshia brevicaudata

The short-tail stingray has a broad, diamond-shaped pectoral fin disc that is wider than it is …

Shorthorn sculpin

Myoxocephalus scorpius

The head is broad and spiny, the body is strong and scaleless. There are two conspicuous …

Shrimp scad

Alepes djedaba

The body of the shrimp scad is elongated, compressed at the sides and covered with fine …

Siberian sturgeon

Huso baerii

The Siberian sturgeon has a spindle-shaped body with several longitudinal rows of bumps. Its short, triangular …

Sicklefin lemon shark

Negaprion acutidens

A large, stocky, yellowish shark with a broad, blunt snout, narrow teeth with smooth protrusions on …

Sicklefin weasel shark

Hemigaleus microstoma

The sicklefin weasel shark has a slender body and a rounded, rather elongated snout. The large …

Silky shark

Carcharhinus falciformis

The name "Silky" was given to the shark because of its soft, placoid scales. The silky …

Silver pomfret

Pampus argenteus

Body very large, strongly compressed at the sides, with hard muscles. Caudal peduncle compressed at the …

Silvermouth trevally

Ulua aurochs

There are many very long, feather-like gill stamens that protrude into the mouth along with the …

Silversides

Leuresthes tenuis

All fish lack a lateral line and have small, almost useless teeth. The pelvic fins are …

Silvertip shark

Carcharhinus albimarginatus

It is a powerful fish with a streamlined body, a moderately long and wide snout, and …

Sixbar grouper

Epinephelus sexfasciatus

In the six-bar grouper, the standard body length is 2.7-3.2 times its thickness. The dorsal profile …

Sixgill stingray

Hexatrygon bickelli

Body flabby, massive, snout elongated, triangular, flattened dorsoventrally, transparent, filled inside with gelatinous mass. In adults, …

Sixspot goby

Valenciennea sexguttata

These fish have an elongated body covered with smooth scales; pointed face with large eyes.