Sea perch, commonly known as the scientific name of "black sea bream", is a sea fish, belonging to the marine animal fish. The body type is similar to that of the sea bream, with a large, flat, long oval head and a blunt tip at the front end, and a narrow back and a large degree of inclination.

"Throwing fish" is referred to as "throwing fish", the scientific name of the spear-tailed complex goby. Their skin is gray or gray dorsal and ventral yellow, body shape like a carrot, head large and flat, slightly similar to freshwater catfish, mouth large but beardless, and the tail is very thin, suitable for growth in the waters of saltwater and freshwater mixed. Its biggest feature is that its life is only one year, both in the spring after the birth of the seeds to die, the end of their short life, as the saying goes, "Throwing the fish a year a death". There are a lot of folklore about the fish dying once a year, but anyone who has lived by the sea can hear about it. There is even a proverb: barracuda head, catfish tail, throw it stomach, toad legs, throw it fish a year to die.