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From FishWiki

Saltwater fish, also known as marine fish, inhabit the world's oceans and seas. They represent a diverse group, with over 20,000 known species ranging from tiny gobies to massive sharks. Saltwater fish come in a variety of shapes, colors, and sizes, creating a fascinating world under the waves that attracts both researchers and hobbyists worldwide.


Saltwater fish inhabit various habitats, from the shallow, warm waters of tropical reefs to the icy, harsh conditions of the Arctic and Antarctic oceans. The deep oceanic trenches also host a variety of unusual and interesting species adapted to live in extreme pressures and low temperatures.

Categories of Saltwater Fish

Saltwater fish can generally be categorized into three main groups: reef fish, pelagic fish, and deep-sea fish.

Reef Fish are typically small, brightly colored species that inhabit coral reefs. They often have specialized diets and lifestyles, intricately linked with the corals they live among. Notable examples include the Clownfish, Surgeonfish, and Butterflyfish.

Pelagic Fish dwell in the open ocean, far from the coast and sea floor. Many are fast swimmers and often exhibit migratory behavior. They are typically larger species and include the various species of Tuna, Swordfish, and Marlins.

Deep-Sea Fish are found in the abyssal zone of the oceans, where conditions are harsh. The pressure is high, temperatures are near freezing, and there is virtually no light. These fish exhibit some of the most extreme adaptations to survive under these conditions. Examples include the Anglerfish, Viperfish, and some species of deep-sea sharks.

Saltwater Aquariums

Keeping saltwater fish in home aquariums has become a popular hobby. However, it presents more challenges compared to freshwater fish-keeping. Saltwater aquariums require meticulous attention to water parameters, including salinity, temperature, pH, and various mineral concentrations.

In addition to this, many saltwater fish have specific dietary and environmental requirements, and some may not get along with others. Therefore, selecting appropriate species for a home aquarium involves careful research and consideration.

Some saltwater fish are hardy and adaptable, suitable for beginners, while others have specific needs that might be better handled by advanced aquarists.

To guide you in this journey, we've compiled a comprehensive list of care sheets for various saltwater fish species. These care sheets provide detailed information about the species' care requirements, including diet, habitat, behavior, compatibility with other species, and more.

Challenges and Rewards of Saltwater Fishkeeping

While saltwater fishkeeping can be challenging, it's also rewarding. The brilliant colors and unique behaviors of marine fish create a captivating display that's hard to replicate with freshwater species. Saltwater aquariums also offer the opportunity to keep a variety of other marine life, including corals, anemones, and crustaceans.

In addition to this, saltwater fishkeeping can be an educational experience. It teaches about the importance of marine ecosystems and the threats they face, including overfishing, climate change, and ocean acidification.

Remember, as a saltwater fish keeper, you can make a difference by choosing captive-bred fish when possible, avoiding species that are overfished or not sustainably sourced, and educating others about the wonders of the world's oceans.

Saltwater Fish Care Sheets


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