Types of Fishes
A fish is any aquatic vertebrate animal that is typically exothermic (or cold-blooded), covered with scales, and equipped with two sets of paired fins and several unpaired fins. Fish are abundant in the sea and in fresh water, with species being known from mountain streams (e.g., char and gudgeon) as well as in the deepest depths of the ocean (e.g., gulpers and anglerfish).
Food prepared from fish are also called fish and it is an important food source for humans.
TYPES OF FISHES:
ACCORDING TO THEIR CHARACTERISTICS:
There are so many types of fishes :
Ø The South American Leaf-fish is an interesting species but definitely not one for the mixed community tank; it can devour prey measuring up to three-quarters of its own length. It lurks among weeds or stones, superbly camouflaged by its leaf-like shape and colour.
Ø Archer-fish are also large mouthed predators. They take food from underwater or from the surface in the normal way but also have a unique method of shooting down insects crawling on leaves overhanging the water. They use the tongue and the roof of the mouth to from a tube through which they spit water by a powerful contraction of their gill covers.
Ø Associations between different kinds of animals are a constant interest. Sea anemones are dangerous to most small fishes because tiger tentacles are loaded with stinging cells. A sick Triangular Butterfly-fish, for instance, will be held and paralyzed by a big anemone, then slowly drawn into its stomach. But a family of damsel-like fishes, the clown fishes, have taken to living among the tentacles of certain large sea anemones.
Ø The healthy clown-fish, nestled among the anemone’s tentacles, is safe from all enemies, but it is doubtful if the anemone gains any advantage at all from the association.
BEWARE OF THE FISH:
Ø There are some aquarium fishes which must be handled with extra care, not only for their sakes but for the sake of the handler; they are quite capable of inflicting painful, even dangerous, wounds on the unwary aquarist.
Ø The Dragon-fish is known by many names, all attesting to its offensive nature: Sting-fish, Wasp-fish, Loin-fish, Fire-fish, and Scorpion-fish. Its spines contain a poison which can inflict an extremely painful sting, a defense against larger predatory fishes or even aquries.
Ø The Clown Loach is the most brightly coloured of the loaches. Once acclimated it is hardy, decorative and long-lived. There is no poison gland, but the knife-like spines easily catch in a net and when trying to extricate the thrashing, entangled fish not only the net but fish and the handler’s fingers may be damaged.
Ø When Golden Sea-horses are imported they are generally almost black. They need to settled down on their own in a well-established tank furnished with living coral rocks, fan worms.
Ø Sea-horses are fastidious and slow feeders which cannot stand competition from greedy fishes such as small shrimps, baby Guppies or mosquito larvae.
Ø Golden Sea-horses quickly take to frozen Fairy Shrimps (Mysis) which can be bought from pet stores. After four to six weeks they will have turned a beautiful deep golden yellow, but if conditions in their tank are not right, they will remain black