1, tuna family (scientific name: Thunnini): is a family of marine fish under the order Scleractinia, order Scombroid, family Scombridae. The family contains 5 genera and 15 species of tuna, the size of each species varies greatly, the smallest tuna is the round rudder skipjack tuna, its maximum length of 50 centimeters, weighing 1.8 kilograms;

The largest tuna is the Atlantic bluefin tuna, its maximum length of 4.6 meters, weighing 684 kilograms, the average length of 2 meters, it is believed that the life expectancy can be as long as 50 years old.

2, the dogfish belongs to the salmoniform order, the dogfish family, the dogfish genus. That is, the black spotted dogfish. Common name: dogfish, duckfish. English name: Pikes , Amur pikc . The dogfish is a widely distributed freshwater fish in the northern hemisphere from the frigid zone to the temperate zone.

The mouth is large and flat like a duck's beak, and the lower jaw is prominent. It is the most aggressive carnivorous of freshwater fish, attacking other fish as well as frogs, mice or ducks. It is said to eat as much food as its own weight in a day. Because of its long life span, the fish can occasionally be found in huge sizes. Because of the excellent flavor of its flesh, it is a good target for fishing.

3. There are two types of jawed needlefish. Tail spot round jaw needlefish and black back round jaw needlefish. Needlefish body is long cylindrical, slightly laterally compressed. The lateral line does not form a bulge saki in the caudal peduncle. The lateral line scales are 142 to 157.

Dorsal fin rays 12 to 15, anal fin rays 15 to 18; posterior margin of caudal fin rounded with a black spot at the base. Warm-water pelagic fish. Body length is generally 200～450 millimeters. Preferring to inhabit in the offshore inland bays or near estuaries, for the jawed needlefish in a smaller individual.

4, Gizzard Shad is an offshore pelagic fish, preferring to inhabit coastal harbors and estuaries, at a depth of 5 to 15 meters. Gizzard Shad is often found in groups, with a wide range of saltiness, both in seawater and in brackish water, and sometimes in fresh water without dying.

Spotted Gizzard Shad feeds on phytoplankton and zooplankton, mainly algae, shellfish, crustaceans and copepod larvae, foraminifera, sand ciliates, etc., and sometimes benthic organisms, zooplankton and small crustaceans.

5, the rollover fish (scientific name: Mola mola) is a rollover triggerfish family, rollover triggerfish genus of large pelagic fish. The body is high and laterally compressed, ovoid, without a caudal peduncle. The head is high and laterally compressed. The eyes are small, superiorly lateral, with raised interocular septa. The muzzle is rounded and blunt. Mouth small, terminal; upper and lower jaws each with a rostral tooth plate, without a central suture. Gill pores small, anterior to pectoral fin base. Body and fins rough, with spiny or granular projections; no lateral line.