CATDOLL : CATDOLL: What are the large and medium-sized tropical fish that can tolerate low temperatures and low oxygen?

1. What are the large and medium-sized tropical fish that can tolerate low temperatures and low oxygen?

There is no tropical fish that can grow at low temperatures, and the so-called low temperature cannot be lower than 18 degrees. Goldfish can be raised above zero degrees.

2. What does cod fish mainly refer to?

Cod fish mainly refers to silver cod.

The sablefish (scientific name: Anoplopoma fimbria) is a fish of the family Scorpionfish and genus Sablefish. It is mainly distributed in the Arctic Ocean and the North Pacific Ocean.

This fish is a deep-sea fish from cold waters. It has a very high nutritional value and contains fat, protein and multiple vitamins. Because it looks like cod, the Japanese market first named it "silver cod". The price is much higher than the real cod. Due to its high nutritional value, it is often used in cooking and is widely distributed in the world's oceans.

Silver cod is the name used in the Chinese and Japanese markets, but there is actually no such species as silver cod. There are two types of fish commonly referred to as silver cod: Chilean sea bass, which belongs to the order Perciformes; and Alaskan black cod, which belongs to the order Scoliniformes.

These two fish have many common characteristics. They both live in cold, deep seas very close to the poles. The difference is that Chilean sea bass is found in the waters near Antarctica, while Alaskan black cod is found in near-Arctic waters.

Although their distribution areas are far apart and face each other, these two fish have common nutritional characteristics like distant relatives. They are rich in Omega-3 highly unsaturated fatty acids, among which DHA is one of the important substances necessary for the growth and development of the human brain.

Additional information:

Morphological characteristics:

The fish body is quite elongated and slightly laterally flattened, cylindrical. The head is pointed; the mouth is large, and the upper jaw is slightly longer than the lower jaw. The teeth are small and form a tooth belt. The upper and lower jaws, the hoe bones, and the palatine bones all have teeth.

The head and body are covered with weak round scales. The dorsal fin is separated, with 19 to 27 spines and 15 to 19 soft rays; the anal fin has 3 spines and 15 to 19 soft rays; the caudal fin is deeply forked.

The back of the body is dark blue-gray or green-gray; the belly is gray or light-colored; except for the first dorsal fin, all fins have black outer edges. The body length can reach 120 cm. The lifespan can reach 20 years.

The body is oblong, with a medium-sized head without spines and ridges, small or medium-sized eyes, located on the upper side, a medium-sized mouth, located anteriorly, with two well-developed nostrils on each side, gill membranes connected to the isthmus, one lateral line, two dorsal fins, anal fins III-11-19, and pelvic fins I-5.

Two dorsal fins separated, XVII-XII, 16-20; anal fins III-15-19, pectoral fins 16; lateral line scales 190-195, gill rakers 62-65. Body elongated, second dorsal fin isomorphic and opposite to anal fin.

3. By the way, I would like to ask, what kind of fish is this and can it tolerate low oxygen?

White mice, what is the situation of hypoxia, so there is no judgment, just keep it normally

4. Which cold water fish can tolerate low oxygen?

Cold-water fish are not tolerant to low oxygen! Cold-water fish usually live in clear mountain streams, where the oxygen content in the water is usually high.