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

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Atlantic Blue Marlin
Dimensioned comparison drawing of the Atlantic Blue Marlin compared to an average person

The Atlantic Blue Marlin (Makaira nigricans) is a large ocean fish that populates the warm and tropical waters worldwide. They belong to the family Istiophoridae and are fast swimmers with females being larger than males. They are highly recognized by their striking beauty, lethal, spear-shaped upper jaw, and pronounced dorsal fins.

The bill of the Atlantic Blue Marlin is also round and pointed, which separated them from other similar looking fish. The Blue Marlin loves the deep open ocean and migrates to follow the warm ocean currents. They are loved by sports fishermen because of their fighting spirit when caught and have also featured in the commonwealth of the Bahamas coat of arms.

Atlantic Blue Marlins have a total length between 5.5’-14’ (1.7-4.3 m), body height of 10”-23” (25.4-58.4 cm), and an overall weight in the range of 200-1800 lb (90-816 kg). The typical lifespan of the Atlantic Blue Marlin is 20-30 years.

Set of scaled elevation drawings of the Atlantic Blue Marlin viewed from the front and side
The Atlantic Blue Marlin (Makaira nigricans) is a large ocean fish that populates the warm and tropical waters worldwide. They belong to the family Istiophoridae and are fast swimmers with females being larger than males. They are highly recognized by their beauty, lethal jaw, and dorsal fins.

Atlantic Blue Marlins have a total length between 5.5’-14’ (1.7-4.3 m), body height of 10”-23” (25.4-58.4 cm), and an overall weight in the range of 200-1800 lb (90-816 kg). The typical lifespan of the Atlantic Blue Marlin is 20-30 years.

Set of scaled elevation drawings of the Atlantic Blue Marlin viewed from the front and side
Atlantic Blue Marlin
Height:
10”-23” | 25.4-58.4 cm
Width:
Length:
5.5’-14’ | 1.7-4.3 m
Depth:
Weight:
200-1800 lb | 90-816 kg
Area:
Scientific Name
Makaira nigricans
Lifespan
20-30 years

Drawings include:

Atlantic Blue Marlin side elevation, front

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Mahi-Mahi | Common Dolphinfish
Dimensioned comparison drawing of the Mahi-Mahi compared to an average person

The Mahi-Mahi (Coryphaena hippurus), also known as the common Dolphinfish, are found in most warm, tropical, and subtropical oceans of the earth. They belong to the family Coryphaenidae with males being larger than females.

Females have round heads while males have prominent protruding foreheads. They have a single long-based fin running along their compressed, slightly slender, long body from the head to the tail. They also have sharply concave caudal and anal fins. The Mahi-Mahi’s side and back show a mix of dazzling green or bright blue colors. The fish also changes color when out of the water and are highly prized as a commercial and sport fish.

Mahi-Mahis have a total length between 33”-55” (84-140 cm), body height of 6.5”-10.5” (16.5-26.7 cm), and an overall weight in the range of 15-40 lb (7-18 kg). The typical lifespan of the Mahi-Mahi is 4-5 years.

Pair of elevation illustrations of the Mahi-Mahi seen from the side and front
The Mahi-Mahi (Coryphaena hippurus), also known as the common Dolphinfish, are found in most warm, tropical, and subtropical oceans of the earth. They belong to the family Coryphaenidae and are a highly prized game fish in commercial and sport fishing.

Mahi-Mahis have a total length between 33”-55” (84-140 cm), body height of 6.5”-10.5” (16.5-26.7 cm), and an overall weight in the range of 15-40 lb (7-18 kg). The typical lifespan of the Mahi-Mahi is 4-5 years.

Pair of elevation illustrations of the Mahi-Mahi seen from the side and front
Mahi-Mahi | Common Dolphinfish
Height:
6.5”-10.5” | 16.5-26.7 cm
Width:
Length:
33”-55” | 84-140 cm
Depth:
Weight:
15-40 lb | 7-18 kg
Area:
Scientific Name
Coryphaena hippurus
Lifespan
4-5 years

Drawings include:

Mahi-Mahi side elevation, front

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Roosterfish
Measured comparison illustration of the size of a Roosterfish to a typical person

The Roosterfish (Nematistius pectoralis) belong to the fish family Mematistiidae inhabiting the East Pacific oceans, starting from Baja in California to Peru. The fish is a popular saltwater game fish because of its deep hard fight. They are identified by the arrangement of their ears and a swim bladder used to amplify sound and body covered in bluish-gray color.

It gets its name from its seven elongated dorsal fin spines. The base of their pectoral fin has a dark spot. Roosterfish love near-shore areas, reefs, and sandy in-shore waters and can be hunted using fly-fishing, live baits, and even spinners.

Roosterfish have a total length between 48”-63” (122-160 cm), body height of 13”-16.5” (33-41.9 cm), and an overall weight in the range of 25-80 lb (11-36 kg). The typical lifespan of the Roosterfish is 20-35 years.

Pair of elevation illustrations of the Roosterfish seen from the side and front
The Roosterfish (Nematistius pectoralis) belong to the fish family Mematistiidae inhabiting the East Pacific oceans, starting from Baja in California to Peru. The fish is a popular saltwater game fish because of its deep hard fight. They are identified by their ear arrangements and swim bladder.

Roosterfish have a total length between 48”-63” (122-160 cm), body height of 13”-16.5” (33-41.9 cm), and an overall weight in the range of 25-80 lb (11-36 kg). The typical lifespan of the Roosterfish is 20-35 years.

Pair of elevation illustrations of the Roosterfish seen from the side and front
Roosterfish
Height:
13”-16.5” | 33-41.9 cm
Width:
Length:
48”-63” | 122-160 cm
Depth:
Weight:
25-80 lb | 11-36 kg
Area:
Scientific Name
Nematistius pectoralis
Lifespan
20-35 years

Drawings include:

Roosterfish side elevation, front

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Atlantic Tarpon
Dimensioned comparison drawing of the Atlantic Tarpon compared to an average person

The Atlantic Tarpon (Megalops atlanticus) can be found in the Atlantic ocean and Indo-Pacific seas and also often in freshwater environments. They belong to the family Megalopidae and love warm shallow darker waters having sandy and muddy bottoms.

They sport large eyes, shiny silvery scales, and blue to green backs plus an elongated dorsal fin ray and anal fin ray. The Tarpon exhibit three distinctive levels of development that take place in varying habitats. It is a popular game fish because of its high-flying antics, elusive nature, size, and fighting spirit. Besides, the tarpon also has a swim bladder that it also uses as a respiratory organ.

Atlantic Tarpons have a total length between 5’-8’ (152-244 cm), body height of 12”-19” (30.5-48 cm), and an overall weight in the range of 60-280 lb (27-127 kg). The typical lifespan of the Atlantic Tarpon is 30-55 years.

Pair of elevation illustrations of the Atlantic Tarpon seen from the side and front
The Atlantic Tarpon (Megalops atlanticus) can be found in the Atlantic ocean and Indo-Pacific seas and also often in freshwater environments. They belong to the family Megalopidae and sport large eyes, shiny silvery scales, and blue to green backs plus an elongated dorsal and anal fin rays.

Atlantic Tarpons have a total length between 5’-8’ (152-244 cm), body height of 12”-19” (30.5-48 cm), and an overall weight in the range of 60-280 lb (27-127 kg). The typical lifespan of the Atlantic Tarpon is 30-55 years.

Pair of elevation illustrations of the Atlantic Tarpon seen from the side and front
Atlantic Tarpon
Height:
12”-19” | 30.5-48 cm
Width:
Length:
5’-8’ | 152-244 cm
Depth:
Weight:
60-280 lb | 27-127 kg
Area:
Scientific Name
Megalops atlanticus
Lifespan
30-55 years

Drawings include:

Atlantic Tarpon side elevation, front

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Wahoo
Scale illustration of an average Wahoo with dimensions length compared to a human

The Wahoo (Acanthocybium solandri) is found in tropical and subtropical open oceans. They belong to the family Scombridae and highly valued by sport fishermen and commercial fishermen. They are large and aggressive predators that would show different color patterns to confuse prey.

The Wahoo is a solitary fish but could also be found in small schools or only congregated to breed. They are known to be broadcast spawners, fast swimmers, and attracted to floating debris. They are identified by their elongated jaws, slender bodies covered in less visible scales, silver bellies, and top in blue coloring. Their body color fades during death.

Wahoos have a total length between 40”-72” (102-183 cm), body height of 6.5”-12” (16.5-30.5 cm), and an overall weight in the range of 15-40 lb (7-18 kg). The typical lifespan of the Wahoo is 5-9 years.

Pair of elevation illustrations of the Wahoo seen from the side and front
The Wahoo (Acanthocybium solandri) is found in tropical and subtropical open oceans. They belong to the family Scombridae and highly valued by sport fishermen and commercial fishermen. They are large and aggressive predators that would show different color patterns to confuse prey.

Wahoos have a total length between 40”-72” (102-183 cm), body height of 6.5”-12” (16.5-30.5 cm), and an overall weight in the range of 15-40 lb (7-18 kg). The typical lifespan of the Wahoo is 5-9 years.

Pair of elevation illustrations of the Wahoo seen from the side and front
Wahoo
Height:
6.5”-12” | 16.5-30.5 cm
Width:
Length:
40”-72” | 102-183 cm
Depth:
Weight:
15-40 lb | 7-18 kg
Area:
Scientific Name
Acanthocybium solandri
Lifespan
5-9 years

Drawings include:

Wahoo side elevation, front

Details & Downloads

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