Fish

A:

Some species of fish, such as the moray eel, can swim backwards. Species of fish that do not swim horizontally include the catfish, the sea horse and the shrimp fish, who swim vertically.

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  • What are big-eyed goldfish?

    Q: What are big-eyed goldfish?

    A: Types of goldfish that have oversized eyes include bubble eyes, celestials, telescopes and black moors. A fifth type of large-eyed goldfish is the demekin, which is a cross between the telescope variety and the arch-bodied ryukin variety.
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  • What do red snapper eat?

    Q: What do red snapper eat?

    A: Red snapper are mostly carnivores, although they do consume a few tiny plants. They mainly eat other fish, crustaceans and shrimp.
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  • Why are crustaceans so well adapted to life on the rocky shore?

    Q: Why are crustaceans so well adapted to life on the rocky shore?

    A: Crustaceans have hard outer shells (exoskeletons), which help them to adapt to life on the rocky shore. The shell protects them against the waves as well as predators, such as birds or sharks.
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  • What do small fish eat?

    Q: What do small fish eat?

    A: Small freshwater fish typically eat vegetation, insects, larvae, leeches, shrimp and dead or decaying matter, and small saltwater fish, called forage or feed fish, eat plankton. The tiny American herring eats small and larval shrimp as do both Atlantic and Pacific cod.
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  • How many fish can I put in my three-gallon aquarium?

    Q: How many fish can I put in my three-gallon aquarium?

    A: A three-gallon aquarium can support three 1-inch fish. The basic rule of thumb when adding fish to an aquarium is that each 1-inch fish needs one gallon of water to give it plenty of room to swim and grow.
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  • Can fish swim backwards?

    Q: Can fish swim backwards?

    A: Some species of fish, such as the moray eel, can swim backwards. Species of fish that do not swim horizontally include the catfish, the sea horse and the shrimp fish, who swim vertically.
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  • How many fish years equal one human year?

    Q: How many fish years equal one human year?

    A: One year in a goldfish's life is equal to five human years, which means one-fifth of a fish year equals one human year. The average lifespan of the common goldfish is 15 years, while exotic goldfish species may live for only eight to 10 years.
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  • Where is a dolphin situated in the food chain?

    Q: Where is a dolphin situated in the food chain?

    A: All types of dolphins are situated very high in their respective food chains, and they are generally considered apex predators. Indeed, the only regular predators dolphins and their calves have in the wild are sharks and, in some places, humans.
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  • How do fish gills work?

    Q: How do fish gills work?

    A: Fish gills act as the equivalent of a mammal's lungs by taking in oxygen and releasing carbon dioxide. Oxygen and carbon dioxide travel across small, thin-walled blood vessels in both lungs and gills. In terms of evolution, gills are significantly older than lungs.
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  • What is a mongrel koi?

    Q: What is a mongrel koi?

    A: Koi fish are really a type of carp. The term "mongrel koi" refers to koi fish which have somehow become inbred with other types of fish. Koi fish are popular for their colors and sleek appearance in fish ponds.
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  • What is the most poisonous fish in the world?

    Q: What is the most poisonous fish in the world?

    A: Reef stonefish are the most poisonous fish in the world. Stonefish live in warm, tropical waters, primarily in the Oceanic region of Australia and New Zealand. They have 13 long spines in their dorsal fins that are filled with highly toxic venom, which the stonefish use to kill prey.
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  • What is included in a list of fish without scales?

    Q: What is included in a list of fish without scales?

    A: Fish that do not have scales include catfish, sharks, rays, chimaeras, skates, moray eels, sturgeons, paddlefishes, salifin blennies, combtooth blennies, hagfishes and lampreys. Many of these fish have evolved scale alternatives.
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  • What type of fish is Dory from Finding Nemo?

    Q: What type of fish is Dory from Finding Nemo?

    A: Dory's character in "Finding Nemo" is a blue tang fish. Blue tang fish are characterized by their bright blue coloring and yellow tail. These fish are found in the Pacific and Indian Oceans.
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  • What is a wild Atlantic salmon?

    Q: What is a wild Atlantic salmon?

    A: The wild Atlantic salmon is a fish of the Salmonidae family, native to the northern Atlantic Ocean and rivers flowing into it. The juvenile salmon live in freshwater rivers and streams until they migrate out to sea, eventually returning to spawn.
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  • What do river fish eat?

    Q: What do river fish eat?

    A: River fish eat crustaceans such as crabs and mollusks. Large river fish such as gar eat other fish. Trout eat smaller fish but also eat insects such as dragonflies, mayflies and caddisflies. They also sometimes feed on zooplankton, which are tiny animals that are swept along by the river's current.
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  • Why do salmon swim upstream?

    Q: Why do salmon swim upstream?

    A: Salmon return to rivers from the ocean and swim upstream to their original hatching place to lay and fertilize their eggs. Swimming upstream is hard work, and only the strongest complete the journey and spawn the next generation of salmon.
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  • Why do mullets jump out of the water?

    Q: Why do mullets jump out of the water?

    A: The most common theories as to why mullets jump out of the water are because the mullets are attempting to shake away parasites, break open eggs during spawning season or avoid predators. Mullets, also called gray mullets, are part of the Mugilidae family and are ray-finned fish found throughout the world in tropical and coastal waters.
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  • What is a leopard puffer fish?

    Q: What is a leopard puffer fish?

    A: The leopard puffer is a marine reef fish that has been introduced as an aquarium fish. It is about 3 inches long and covered with black spots. It also has blue-and-yellow stripes.
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  • What are some clownfish enemies?

    Q: What are some clownfish enemies?

    A: Enemies of clownfish include eels, sharks and large fish. Humans are the biggest threat to clownfish, as people catch them for use in fish tanks and aquariums.
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  • What is an Emperor tetra?

    Q: What is an Emperor tetra?

    A: The emperor tetra is a fish of the Characidae family that's native to South America. The species is black, purple and silver in color with translucent fins that reach about 1.5 inches in length.
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  • What is the scientific name for a dolphin?

    Q: What is the scientific name for a dolphin?

    A: The dolphin is of the species Odontocete and family Delphinidae. Their species is the same as that of toothed whales. The orca whale is also a member of the dolphin family.
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