Saltwater Fish are fish that are found in the oceans or marine environments. Saltwater fish are categorized based on the marine environment they live in. Attributes that define a marine environment for a saltwater fish are, the temperature of the water, the depth or flow of the water, the water’s PH, the amount of salt in the water, the alkalinity of the water, and the location of the water including coastal environments to coral reefs and open oceans. Saltwater Fish can either live alone or in big groups of fish, called schools. Saltwater Fish can be hunted for food or to keep in captivity, such as aquariums, for entertainment.

What do saltwater fish eat?


Saltwater fish can carry carnivore, herbivore, or omnivore diets. Herbivore saltwater fish consume both microalgae and macroalgae as well as seagrasses. A carnivore’s diet typically consists of shrimp, plankton, and tiny crustaceans. Some carnivores may eat worms, clams, and parasites. Most carnivore saltwater fish will not eat algae even if they are starving.

Why can’t saltwater fish live in freshwater?

Saltwater fish are not able to live in freshwater because their bodies are concentrated from salt solution. Saltwater fish would not be able to osmoregulate correctly in freshwater. Freshwater would flow into their body up to the point where all cells can accumulate water causing them to bloat and die.

How do you acclimate saltwater fish?

Saltwater fish can be acclimated in a couple of ways. This can be done by modifying the water’s salinity, altering the pH of the water, and using the drip method or the floating method. It is important to acclimate saltwater fish because changes in salinity, water temperature, and water chemistry can cause stresses that shock the fish to death.

Saltwater Fish Guides
Browse through our curated Saltwater Fish Guides for additional categorizations, tips, details, variations, styles, and histories of Saltwater Fish. Guides provide additional insights into the unique properties and shared relationships between elements.
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.9”-1.5” | 2.4-3.8 cm
3.1”-5.1” | 8-13 cm
8-10 years
Amazon Puffer
3.800
13.000
10.00
3250
3D
Amazon Puffer
10”-23” | 25.4-58.4 cm
5.5’-14’ | 1.7-4.3 m
200-1800 lb | 90-816 kg
20-30 years
Atlantic Blue Marlin
58.400
430.000
816.000
30.00
1500
3D
Atlantic Blue Marlin
24”-50” | 61-127 cm
7’-15’ | 2.1-4.6 m
550–2000 lb | 250-907 kg
15-30 years
Atlantic Bluefin Tuna
127.000
460.000
907.000
30.00
4300
3D
Atlantic Bluefin Tuna
13”-20” | 33-50.8 cm
7.5’-11’ | 2.3-3.4 m
132-220 lb | 60-100 kg
10-15 years
Atlantic Sailfish
50.800
340.000
100.000
15.00
450
3D
Atlantic Sailfish
12”-19” | 30.5-48 cm
5’-8’ | 152-244 cm
60-280 lb | 27-127 kg
30-55 years
Atlantic Tarpon
48.000
244.000
127.000
55.00
700
3D
Atlantic Tarpon
26”-49” | 66-125 cm
6.6-8.8 lb | 3-4 kg
10-15 years
Australian Ghost Shark
125.000
4.000
15.00
550
3D
Australian Ghost Shark
1.4”-2” | 3.5-5 cm
9.1”-13.8” | 23-35 cm
3-6 years
Big-Belly Seahorse
5.000
35.000
6.00
1250
3D
Big-Belly Seahorse
3.5”-6.5” | 8.9-16.5 cm
16”-30” | 40-75 cm
7-20 lb | 3-9 kg
10-20 years
Bonefish
16.500
75.000
9.000
20.00
100
3D
Bonefish
3.5”-12.6” | 9-32 cm
10”-36” | 25.4-91.4 cm
11-22 lb | 5-10 kg
8-11 years
Common Hogfish
32.000
91.400
10.000
11.00
45080
3D
Common Hogfish
.4”-1” | 1-2.5 cm
2.75”-6.7” | 7-17 cm;
1-4 years
Common Seahorse
2.500
17.000
4.00
240800
3D
Common Seahorse
5.1”-5.9” | 13-15 cm
7”-8” | 18-20 cm
4-10 years
Copperband Butterflyfish
15.000
20.000
10.00
3700
3D
Copperband Butterflyfish
.1”-.2” | .3-.6 cm
1”-2” | 2.5-5.1 cm
1-2 years
Dwarf Seahorse
0.600
5.100
2.00
3900
3D
Dwarf Seahorse
7.9”-22” | 20-56 cm
10’-26.2’ | 3-8 m; 36’ | 11 m (Max)
882-1,322 lb | 400-600 kg
7-12 years
Giant Oarfish
56.000
800.000
600.000
12.00
21900
3D
Giant Oarfish
10”-20” | 25.4-50.8 cm
33”-67” | 85-170 cm
33-132 lb | 15-60 kg
10-25 years
Giant Trevally
50.800
170.000
60.000
25.00
4700
3D
Giant Trevally
3.3”-3.9” | 8.5-10 cm
8.3”-9.8” | 21-25 cm
.9-1.2 oz | .02-.03 kg
15-20 years
Hairy Frogfish
10.000
25.000
0.030
20.00
5250
3D
Hairy Frogfish
1”-1.4” | 2.5-3.5 cm
5”-7.5” | 13-19 cm
1-4 years
Lined Seahorse
3.500
19.000
4.00
1800
3D
Lined Seahorse
6.5”-10.5” | 16.5-26.7 cm
33”-55” | 84-140 cm
15-40 lb | 7-18 kg
4-5 years
Mahi-Mahi
26.700
140.000
18.000
5.00
6200
3D
Mahi-Mahi
.6”-1.4” | 1.5-3.5 cm
1.5”-4” | 4-10 cm
.4-.7 lb | .2-.3 kg
3-6 years
Ocellaris Clownfish
3.500
10.000
0.300
6.00
10700
3D
Ocellaris Clownfish
5.5”-8.7” | 14-22 cm
11.8”-17.7” | 30-45 cm
2.5-3.5 lb | 1.1-1.6 kg
15-20 years
Queen Angelfish
22.000
45.000
1.600
20.00
7650
3D
Queen Angelfish
3.1”-4.3” | 8-11 cm
11-15” | 28-38 cm
1-2.6 lb | .5-1.2 kg
10-18 years
Red Lionfish
11.000
38.000
1.200
18.00
10100
3D
Red Lionfish
2.6”-4.3” | 6.5-11 cm
9.8”-15.75” | 25-40 cm
.7-.9 lb | .3-.4 kg
9-12 years
Red-Lipped Batfish
11.000
40.000
0.400
12.00
11800
3D
Red-Lipped Batfish
3.7”-4.9” | 9.5-12.5 cm
9.8”-11.8” | 25-30 cm
5-10 years
Reef Triggerfish
12.500
30.000
10.00
5750
3D
Reef Triggerfish
13”-16.5” | 33-41.9 cm
48”-63” | 122-160 cm
25-80 lb | 11-36 kg
20-35 years
Roosterfish
41.900
160.000
36.000
35.00
3000
3D
Roosterfish
Wahoo
41000
6.5”-12” | 16.5-30.5 cm
40”-72” | 102-183 cm
15-40 lb | 7-18 kg
5-9 years
Wahoo
30.500
183.000
18.000
9.00
41000
3D
Wahoo
.6”-2.6” | 1.5-6.5 cm
3.9”-12.2” | 10-31 cm
5-8 years
Yellow Goatfish
6.500
31.000
8.00
430
3D
Yellow Goatfish
10.5”-20.5” | 26.7-52 cm
43”-83” | 110-210 cm
300-400 lb | 136-181 kg
5-10 years
Yellowfin Tuna
52.000
210.000
181.000
10.00
22000
3D
Yellowfin Tuna
Giant Trevally
Scale illustration of an average Giant Trevally with dimensions length compared to a human

The Giant Trevally (Caranx ignobilis), also known as Ulua, barrier trevally, giant kingfish, and lowly trevally, are fish that belong to the family Carangiformes and inhabit the warm waters of the Pacific and Indian ocean. They are popular gamefish and not edible for the possibility of ciguatera poisoning.

These animals are identified by their strong tail scutes and steep head profiles. The Giant Trevally prefers solitary life and only congregates in schools to feed or reproduce. Juveniles are silvery-grey while mature male Giant Trevally have black colorations and spot an intimidating stare. They love to follow sharks and seals to feed on forgotten prey.

Giant Trevallies have a total length between 33”-67” (85-170 cm), body height of 10”-20” (25.4-50.8 cm), and an overall weight in the range of 33-132 lb (15-60 kg). The typical lifespan of the Giant Trevally is 10-25 years.

Pair of elevation illustrations of the Giant Trevally seen from the side and front
The Giant Trevally (Caranx ignobilis), also known as Ulua, barrier trevally, giant kingfish, and lowly trevally, are fish that belong to the family Carangiformes and inhabit the warm waters of the Pacific and Indian ocean. They are popular gamefish and not edible for the possibility of poisoning.

Giant Trevallies have a total length between 33”-67” (85-170 cm), body height of 10”-20” (25.4-50.8 cm), and an overall weight in the range of 33-132 lb (15-60 kg). The typical lifespan of the Giant Trevally is 10-25 years.

Pair of elevation illustrations of the Giant Trevally seen from the side and front
Giant Trevally
Height:
10”-20” | 25.4-50.8 cm
Width:
Length:
33”-67” | 85-170 cm
Depth:
Weight:
33-132 lb | 15-60 kg
Area:
Scientific Name
Caranx ignobilis
Lifespan
10-25 years

Drawings include:

Giant Trevally side elevation, front

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Red Lionfish (Pterois volitans)
Dimensioned comparison drawing of the Red Lionfish compared to other saltwater fish

The Red Lionfish, known scientifically as Pterois volitans, is a pervasive invasive species rapidly spreading across the globe due to its lack of natural predators, ability to breed monthly, and travel vast distances as larvae. The Red Lionfish, the largest species of lionfish, are clad in red, white, and brown stripes with long, venomous spikes that form a mane, thus inspiring their “lionfish” name. Originating in the Indo-Pacific ocean, the Red Lionfish can now be found in the Caribbean Sea, Atlantic Ocean off the east coast of the United States, the East Mediterranean, and Brazil. Due to their invasiveness, the hunting and consumption of Red Lionfish is being promoted by multiple organizations.

A look at the Red Lionfish sends a message of a fish not to be messed with. However, even with its scary look and venomous nature, it can be harvested and consumed. The red lionfish also use camouflage and quick reflexes to defend itself or lure prey. It is nocturnal, commonly found alone, but prefers having several mates.



Red Lionfish have a total length between 11-15” (28-38 cm) and body height of 3.1”-4.3” (8-11 cm). The typical weight of the Red Lionfish is in the range of 1-2.6 lb (.5-1.2 kg). Red Lionfish have lifespans between 10-18 years.

Set of scaled elevation drawings of the Red Lionfish
The Red Lionfish, known scientifically as Pterois volitans, is a pervasive invasive species rapidly spreading across the globe due to its lack of natural predators, ability to breed monthly, and travel vast distances as larvae. The Red Lionfish, the largest species of lionfish, are clad in red.

Red Lionfish have a total length between 11-15” (28-38 cm) and body height of 3.1”-4.3” (8-11 cm). The typical weight of the Red Lionfish is in the range of 1-2.6 lb (.5-1.2 kg). Red Lionfish have lifespans between 10-18 years.

Set of scaled elevation drawings of the Red Lionfish
Red Lionfish (Pterois volitans)
Height:
3.1”-4.3” | 8-11 cm
Width:
Length:
11-15” | 28-38 cm
Depth:
Weight:
1-2.6 lb | .5-1.2 kg
Area:
Scientific Name
Pterois volitans
Lifespan
10-18 years

Drawings include:

Red Lionfish side elevation, front

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Atlantic Bluefin Tuna
Measured comparison illustration of the size of a Atlantic Bluefin Tuna to a typical person

Atlantic Bluefin tuna (Thunnus thynnus) are members of the family Scombridae and found in the warm waters of North America, Europe, and the Mediterranean sea. They are deep divers utilizing their torpedo-shaped bodies for speed and endurance.

The Bluefin Tuna is a warm-blooded animal with a conical head, sharpest vision, and voracious appetite. They also migrate and are identified by their white underside and metallic blue on top of their bodies, which also conceals them from above and below the water. Sport fishermen and commercial fishers love the bluefin tuna for its meat, speed, and fighting spirit.

Atlantic Bluefin Tunas have a total length between 7’-15’ (2.1-4.6 m), body height of 24”-50” (61-127 cm), and an overall weight in the range of 550–2000 lb (250-907 kg). The typical lifespan of the Atlantic Bluefin Tuna is 15-30 years.

Scaled collection of drawings of Atlantic Bluefin Tuna in front and side poses
Atlantic Bluefin tuna (Thunnus thynnus) are members of the family Scombridae and found in the warm waters of North America, Europe, and the Mediterranean sea. They are deep divers utilizing their torpedo-shaped bodies for speed and endurance.

Atlantic Bluefin Tunas have a total length between 7’-15’ (2.1-4.6 m), body height of 24”-50” (61-127 cm), and an overall weight in the range of 550–2000 lb (250-907 kg). The typical lifespan of the Atlantic Bluefin Tuna is 15-30 years.

Scaled collection of drawings of Atlantic Bluefin Tuna in front and side poses
Atlantic Bluefin Tuna
Height:
24”-50” | 61-127 cm
Width:
Length:
7’-15’ | 2.1-4.6 m
Depth:
Weight:
550–2000 lb | 250-907 kg
Area:
Scientific Name
Thunnus thynnus
Lifespan
15-30 years

Drawings include:

Atlantic Bluefin Tuna side elevation, front

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Big-Belly Seahorse (Hippocampus abdominalis)
Scale illustration of an average Big-Belly Seahorse compared to other saltwater fish species

The Big-belly seahorse (Hippocampus abdominalis) is also called pot-bellied seahorse and is the largest breed found in the water of southeast Australia and New Zealand. They belong to the family Syngnathidae and love areas with rock reefs, seagrass, and algae. It’s identified by a prominent belly, long-snouted head tilted forward, and long coiled tail. These seahorses love to assume a vertical position and use their dorsal fin to swim. They feed by sucking prey. The animals can also change color, especially during courtship. The males are distinguished from females using their smooth, pouch-like abdomen. The Big-belly seahorse is popular in the aquarium and also sold as traditional medicine.

Big-Belly Seahorses have a total length between 9.1”-13.8” (23-35 cm) and body height of 1.4”-2” (3.5-5 cm). The typical lifespan of the Big-Belly Seahorse is in the range of 3-6 years.

Series of elevation illustrations of the Big-Belly Seahorse
The Big-belly seahorse (Hippocampus abdominalis) is also called pot-bellied seahorse and is the largest breed found in the water of southeast Australia and New Zealand. They belong to the family Syngnathidae and love areas with rock reefs, seagrass, and algae. It’s identified by a prominent belly.

Big-Belly Seahorses have a total length between 9.1”-13.8” (23-35 cm) and body height of 1.4”-2” (3.5-5 cm). The typical lifespan of the Big-Belly Seahorse is in the range of 3-6 years.

Series of elevation illustrations of the Big-Belly Seahorse
Big-Belly Seahorse (Hippocampus abdominalis)
Height:
1.4”-2” | 3.5-5 cm
Width:
Length:
9.1”-13.8” | 23-35 cm
Depth:
Weight:
Area:
Scientific Name
Hippocampus abdominalis
Lifespan
3-6 years

Drawings include:

Big-Belly Seahorse side elevation, front

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Ocellaris Clownfish (Amphiprion ocellaris)
Scale illustration of an average Ocellaris Clownfish compared to other saltwater fish species

The Ocellaris Clownfish, also known as Amphiprion ocellaris, is a small, vertically striped fish that is a part of the clownfish family. The Ocellaris Clownfish is very similar to the Amphiprion percula, as they have the same coloring and stripe patterns with the couple exceptions being the thickness of the black outlines on the stripes and the number of dorsal fins. The Ocellaris Clownfish has a relatively round body and can be either orange, brown-red, or black with white stripes. The color of the Ocellaris Clownfish’s body depends on its geographic location. As youths, the Ocellaris Clownfish, immune to the stings of anemone, form symbiotic relationships with anemone and take shelter in them.

One of the most sought-after aquarium fish is the Ocellaris Clownfish. Aquarium owners love it for its brilliant colors, which vary from fish to fish depending on where it lives. This fish is found in the western Pacific Ocean and Eastern Indian ocean, living among sea anemones. It is also called common clownfish or false percula clownfish. Most of them have three white bands with black outlines on their orange body. That is on the head, body, and tail. The body is stocky and oval. They are hermaphrodites and omnivores, born gender neutral and turn into male before changing sex to female.



Ocellaris Clownfish have a total length between 1.5”-4” (4-10 cm) and body height of .6”-1.4” (1.5-3.5 cm). The typical weight of the Ocellaris Clownfish is in the range of .4-.7 lb (.2-.3 kg). Ocellaris Clownfish have lifespans between 3-6 years.

Series of elevation illustrations of the Ocellaris Clownfish
The Ocellaris Clownfish, also known as Amphiprion ocellaris, is a small, vertically striped fish that is a part of the clownfish family. The Ocellaris Clownfish is very similar to the Amphiprion percula, as they have the same coloring and stripe patterns with a couple exceptions.

Ocellaris Clownfish have a total length between 1.5”-4” (4-10 cm) and body height of .6”-1.4” (1.5-3.5 cm). The typical weight of the Ocellaris Clownfish is in the range of .4-.7 lb (.2-.3 kg). Ocellaris Clownfish have lifespans between 3-6 years.

Series of elevation illustrations of the Ocellaris Clownfish
Ocellaris Clownfish (Amphiprion ocellaris)
Height:
.6”-1.4” | 1.5-3.5 cm
Width:
Length:
1.5”-4” | 4-10 cm
Depth:
Weight:
.4-.7 lb | .2-.3 kg
Area:
Scientific Name
Amphiprion ocellaris
Lifespan
3-6 years

Drawings include:

Ocellaris Clownfish side elevation, front

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