CATDOLL : CATDOLL: How do tropical fish move in the sea?

Tropical fish are born in tropical waters and are divided into freshwater tropical fish and marine tropical fish. However, in the near-tropical and north-south temperate waters bordering it, fish species with ornamental value are also classified as tropical fish, so their distribution also includes some subtropical areas.

In terms of preferences, most tropical fish like to live in a clean, spacious, bright deep water environment. They are most active when the water temperature is between 20℃ and 30℃. They are not adapted to strong sunlight stimulation and prefer a living environment with aquatic plants. Except for a few species such as fighting fish, which are ferocious and aggressive by nature, most of them are timid and afraid of being frightened. They generally do not eat much. In addition to eating active flea bait, they also eat some algae and moss. They like to live in groups and swim in groups. Therefore, it is most suitable to raise them in a relatively spacious and large glass aquarium. Many species of tropical fish are good at jumping, so it is best to cover the aquarium to prevent the fish from jumping out.

Tropical fishes have very different personalities, but because they are born in the tropics, they also have many common habits. Their homeland is hot and humid all year round. The water temperature changes between winter and summer do not exceed 3℃ to 5℃, and the water quality is mostly acidic. Therefore, tropical fishes are only suitable for living in a water environment of 18℃ to 32℃, and they have relatively strict requirements on water temperature. Water temperatures below 22℃ or above 28℃ are not conducive to the normal growth of tropical fishes.

The growth and reproduction of tropical fish must be carried out under certain water temperature conditions. If the water temperature exceeds this range, tropical fish will be affected to varying degrees. Generally speaking, the water temperature for raising tropical fish cannot be lower than 22℃, and the water temperature for breeding tropical fish should be kept at around 25℃. Since the growth and reproduction temperature of tropical fish is affected by many factors, it often changes and should be considered according to the specific situation.

There are many oviparous fish among tropical lizards, and they do not like strong light. Generally, large fish like strong light, while small fish do not like strong light. After being exposed to strong light for a long time, the body color of small tropical fish becomes dull and not beautiful. If algae and other aquatic plants in the aquarium can get proper light, they can grow faster and more prosperous through photosynthesis, increase the amount of dissolved oxygen in the water, and are conducive to the healthy growth of tropical fish.

If the breeder wants to know whether the fish in the aquarium are getting appropriate lighting, he can judge from the fish's activities. For example, if the fish are healthy and lively when swimming, have a good appetite, and the aquarium plants are growing lush and green, it means the lighting is appropriate.

Tropical fish use their fins to swim along curves in the water. The fish's body is a very standard streamlined shape, and its body is covered with mucus. In addition, the gravity in the water is small, so the fish only needs to swing its tail to swim forward quickly.

In its state:

(1) The tail fin provides the main power and direction control;

(2) The pectoral fins provide auxiliary power and control backward movement and steering;

(3) The dorsal fin controls the direction of linear motion;

(4) Anal fin assists in steering control;

(5) The fish's swim bladder controls buoyancy;

(6) The lateral line is responsible for sensing hydrological information such as water flow rate;

(7) Fish scales and body mucus are used to balance and reduce movement resistance.