Alphabetical: common name
- Sablefish
- Saithe
- Salamanders
- Salmon, Atlantic
- Salmon, Baltic
- Salmon, Black Sea
- Salmon, Chinook
- Salmon, Chum
- Salmon, Coho
- Salmon, Danube
- Salmon, Masou
- Salmon, pink
- Salmon, sockeye
- Salmonids (salmon, trout)
- Salmonoids (salmon, trout, whitefish)
- Salmons, Pacific
- Sand lance, Pacific
- Sand lances
- Sandeel, Pacific
- Sandeels
- Sandeels
- Sandlance, Pacific
- Sandlances
- Sandsmelts
- Sardinellas
- Sardines
- Scabbardfish
- Scabbardfishes
- Scad, big-eye
- Scallop, calico
- Scallop, common
- Scallop, Japanese
- Scallop, New Zealand
- Scallop, Peruvian calico
- Scallops
- Scat, spotted
- Sculpin, Japanese
- Sculpin, mottled
- Sculpins
- Sea bass
- Sea basses, white
- Sea scorpion
- Seabass, European
- Seabass, Japanese
- Seabass, white
- Seabasses
- Seabream, black (Schlegel's)
- Seabream, crimson
- Seabream, gilt-head
- Seabream, red
- Seabream, yellowfin
- Seabream, yellowfin
- Seabreams
- Seagull, greater black-backed
- Seagull, herring
- Shad, American gizzard
- Shads
- Shark, brown
- Shark, sandbar
- Sharks, requiem
- Sharks, sand
- Sheatfish ( wels catfish)
- Sheatfish ( wels catfish)
- Shiner, common
- Shiner, emerald
- Shiner, golden
- Shrimp, alpheid
- Shrimp, blue
- Shrimp, brown
- Shrimp, coastal mud
- Shrimp, kadal
- Shrimp, karikkadi
- Shrimp, mangrove
- Shrimp, Mediterranean grey
- Shrimp, mud
- Shrimp, northern brown
- Shrimp, northern pink
- Shrimp, northern white
- Shrimp, Pacific white
- Shrimp, palaemonid
- Shrimp, pink
- Shrimp, sand
- Shrimp, snapping
- Shrimp, southern rough
- Shrimp, southern white
- Shrimp, speckled
- Shrimp, yellow
- Shrimp, yellow-leg
- Shrimps, penaeid
- Sillago-whitings
- Silverside, Atlantic
- Silversides
- Skates
- Smelt, European
- Smelt, rainbow
- Smelt, surf
- Smelts
- Smooth (or common) newt
- Smoothhounds
- Snakehead, bullseye
- Snakehead, Formosa
- Snakehead, striped
- Snakeheads
- Snoek
- Snook, common
- Snubnose dart
- Sole, common
- Sole, English
- Sole, Senegalese
- Soles
- Soletellina acuta
- Southern white shrimp
- Spinefeet
- Spiny lobster, longlegged
- Spiny lobster, mud
- Spiny lobster, ornate
- Spiny lobster, painted
- Spiny lobster, pronghorn
- Spiny lobster, scalloped
- Splake (brook trout-lake trout hybrid)
- Spotted Chorus Frog
- Sprat
- Squid, shortfin
- Squillid, mantis
- Stickleback, brook
- Stickleback, threespine
- Sticklebacks
- Sturgeon, common
- Sturgeon, lake
- Sturgeon, Russian
- Sturgeon, Siberian (hybrid)
- Sturgeon, white
- Sturgeons
- Suckers
- Suckers, white
- Sweetlips, crescent