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Threatened Fish
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Threatened Fish
Species
1
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50
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55
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Salmon shark (
Lamna ditropis
)
This formidable hunter, which is sometimes mistaken for the white shark (Carcharodon carcharias), can be distinguished by its...
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1 Image
2 Videos
San Marcos gambusia (
Gambusia georgei
)
Information on the San Marcos gambusia is currently being researched and written and will appear here...
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2 Images
0 Videos
Sand tiger shark (
Carcharias taurus
)
This stocky shark has a conical nose and a slightly flattened head. It is a dark brown or beige colour above, with blotches...
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15 Images
4 Videos
Sandbar shark (
Carcharhinus plumbeus
)
The most distinctive feature of this stocky, grey shark is its huge dorsal fin, which increases its stability as it cruises the sea...
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9 Images
1 Video
Savoury cichlid (
Oreochromis esculentus
)
Information on the savoury cichlid is currently being researched and written and will appear here...
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2 Images
0 Videos
Sawfin (
Barbus serra
)
The sawfin is a river-dwelling, South African fish with a long, pointed snout and a large first dorsal fin that is bony and...
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2 Images
0 Videos
Scalloped hammerhead (
Sphyrna lewini
)
This large hammerhead shark can be distinguished from other hammerhead species by the ‘scalloped' front edge of its hammer-shaped...
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18 Images
7 Videos
Sharpnose sevengill shark (
Heptranchias perlo
)
The large, florescent green eyes of this slender shark may be its most noticeable feature as it moves silently though the ocean...
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1 Image
0 Videos
Sharptooth lemon shark (
Negaprion acutidens
)
This big, stocky shark looks almost identical to the lemon shark (Negaprion brevirostris), but can be distinguished by the rear...
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5 Images
0 Videos
Shiho's seahorse (
Hippocampus sindonis
)
Information on the Shiho's seahorse is currently being researched and written and will appear here...
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1 Image
0 Videos
Short dragonfish (
Eurypegasus draconis
)
Information on the short dragonfish is currently being researched and written and will appear here...
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14 Images
1 Video
Short-snouted seahorse (
Hippocampus breviceps
)
Information on the short-snouted seahorse is currently being researched and written and will appear here...
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11 Images
0 Videos
Short-tail nurse shark (
Pseudoginglymostoma brevicaudatum
)
Information on the short-tail nurse shark is currently being researched and written and will appear here...
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1 Image
0 Videos
Shortfin mako (
Isurus oxyrinchus
)
The shortfin mako is believed to be the fastest-swimming of all sharks, thought to be capable of attaining bursts of speed...
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11 Images
4 Videos
Shortjaw cisco (
Coregonus zenithicus
)
Information on the shortjaw cisco is currently being researched and written and will appear here...
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2 Images
0 Videos
Shortnose sturgeon (
Acipenser brevirostrum
)
Information on the shortnose sturgeon is currently being researched and written and will appear here...
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1 Image
0 Videos
Shortspine spurdog (
Squalus mitsukurii
)
The shortspine spurdog, belonging to the Squalidae, or dogfish family, is characterised by having two dorsal fins, each preceded...
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3 Images
0 Videos
Shoshone sculpin (
Cottus greenei
)
Information on the Shoshone sculpin is currently being researched and written and will appear here...
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1 Image
0 Videos
Shovelnose guitarfish (
Rhinobatos productus
)
The shovelnose guitarfish has an unusual body shape, intermediate between that of a shark and a ray, and is named for its long...
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8 Images
0 Videos
Siberian sturgeon (
Acipenser baerii
)
Information on the Siberian sturgeon is currently being researched and written and will appear here...
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6 Images
2 Videos
Silver shark (
Balantiocheilos melanopterus
)
Information on the silver shark is currently being researched and written and will appear here...
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9 Images
0 Videos
Slackwater darter (
Etheostoma boschungi
)
Information on the slackwater darter is currently being researched and written and will appear here...
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2 Images
0 Videos
Slender chub (
Erimystax cahni
)
Information on the slender chub is currently being researched and written and will appear here...
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1 Image
0 Videos
Smalleye hammerhead (
Sphyrna tudes
)
The most prominent feature of the smalleye hammerhead, like other hammerhead species, is its peculiar mallet-shaped head structure...
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2 Images
0 Videos
Smalleye shiner (
Notropis buccula
)
Information on the smalleye shiner is currently being researched and written and will appear here...
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1 Image
0 Videos
Smalleyed ray (
Raja microocellata
)
Like other skates and rays, the most notable feature of the smalleyed ray is its large pectoral fins that provide gentle propulsion...
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3 Images
0 Videos
Smallscaled grouper (
Epinephelus polylepis
)
Having been repeatedly misidentified as Epinephelus chlorostigma for almost a century, the smallscaled grouper was first described...
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1 Image
0 Videos
Smalltooth sand tiger shark (
Odontaspis ferox
)
Information on the smalltooth sand tiger shark is currently being researched and written and will appear here...
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3 Images
0 Videos
Smalltooth sawfish (
Pristis pectinata
)
The smalltooth sawfish gets its name from the Greek word ‘pristis', meaning saw and the small teeth that line the edges of its saw...
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1 Image
0 Videos
Smooth hammerhead (
Sphyrna zygaena
)
A member of a large and easily recognisable group of sharks, the smooth hammerhead can be distinguished from the other hammerhead...
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6 Images
0 Videos
Smoothtail devil ray (
Mobula thurstoni
)
Like other rays, the smoothtail devil ray has a distinctive disc-like body with large, triangular pectoral fins that function like...
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5 Images
0 Videos
Smoothtail mobula (
Mobula munkiana
)
In common with other species in the Mobulidae family, the smoothtail mobula has long, pointed, pectoral fins which it strokes...
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5 Images
1 Video
Sohal surgeonfish (
Acanthurus sohal
)
Information on the Sohal surgeonfish is currently being researched and written and will appear here...
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10 Images
0 Videos
Songatana (
Oxylapia polli
)
Information on the songatana is currently being researched and written and will appear here...
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1 Image
0 Videos
Southern bluefin tuna (
Thunnus maccoyii
)
The southern bluefin tuna is one of the largest bony fish in the world. The incredibly streamlined and powerful body is deepest...
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4 Images
1 Video
Southern stingray (
Dasyatis americana
)
The southern stingray is adapted for life on the sea bed. The flattened, diamond-shaped body has sharp corners, making it more...
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15 Images
1 Video
Spangled emperor (
Lethrinus nebulosus
)
Information on the spangled emperor is currently being researched and written and will appear here...
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5 Images
0 Videos
Spanish toothcarp (
Aphanius iberus
)
Information on the Spanish toothcarp is currently being researched and written and will appear here...
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1 Image
0 Videos
Spinner shark (
Carcharhinus brevipinna
)
The spinner shark is a long, slender-bodied shark, so named for its habit of leaping from the water, when hooked or pursuing prey...
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5 Images
1 Video
Spiny dogfish (
Squalus acanthias
)
The common name ‘dogfish' was given by fisherman to small sharks due to their habit of hunting shoals of fish in ‘packs'. The spiny...
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11 Images
0 Videos
Spiny pipehorse (
Solegnathus spinosissimus
)
Pipehorses are small fishes with slender and elongate bodies. Unlike many other fish, their bodies have no internal bones...
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10 Images
0 Videos
Spiny seahorse (
Hippocampus histrix
)
Named after the spines that project from the corners of the bony plates covering the body, the spiny seahorse is, like all...
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23 Images
0 Videos
Spinycheek grouper (
Epinephelus diacanthus
)
As its name suggests, the spinycheek grouper has one to five, prominent spines on its cheek, in front of the gills. Like other...
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2 Images
0 Videos
Splendid toadfish (
Sanopus splendidus
)
With vibrant, bright yellow fins and distinctive patterning, the splendid toadfish is a striking exception to the typical drab...
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3 Images
0 Videos
Spotfin betta (
Betta macrostoma
)
The spotfin betta is a small and attractively marked freshwater fish, and gains its common name from the black ‘eye' spot on the...
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6 Images
0 Videos
Spotted eagle ray (
Aetobatus narinari
)
The spotted eagle ray is very distinctive with a flattened body and triangular corners to the wing-like pectoral fins. The snout...
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22 Images
9 Videos
Spotted handfish (
Brachionichthys hirsutus
)
The spotted handfish is one of the world's most endangered marine fish. This extremely distinctive fish is almost pear-shaped and...
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6 Images
4 Videos
Spotted wobbegong (
Orectolobus maculatus
)
With its broad and flattened body, and cryptic colouration, the spotted wobbegong is perfectly adapted to a life on the seabed....
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8 Images
0 Videos
Star sturgeon (
Acipenser stellatus
)
Belonging to an ancient group of fish, the prehistoric-looking star sturgeon is notable for being one of the three main caviar...
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5 Images
0 Videos
Sterlet (
Acipenser ruthenus
)
Information on the sterlet is currently being researched and written and will appear here...
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10 Images
0 Videos
Species
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Latest news
3rd November 2009: IUCN Red List of Threatened Species - Extinction crisis continues.
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What's new in ARKive
Rare images of the Critically Endangered cao-vit crested gibbon.
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Fascinating footage of red kangaroo thermoregulation.
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An image of the Extinct longnose stubfoot toad.
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The only known images of the Critically Endangered Eskimo curlew.
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Rare camera trap images of Diard's clouded leopard.
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Under the Sea
Dusky dolphins are inquisitive creatures, as seen here investigating a southern right whale.
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Since the megamouth shark's discovery, only 17 sightings have been recorded of this elusive fish.
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The basking shark is the second largest fish in the sea, reaching up to 10 metres in length.
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The giant clam is the largest species of bivalve mollusc on fossil record and can weigh up to 300kg.
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Leafy seadragons hatch from the male and will reach maturity within 2 years of life.
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