Some ichthyofauna species, such as anchovy, garfish, Black Sea whiting and pickerel, visit the Sea of Azov from the Black Sea for spawning. This was especially frequent in 1975–77 when the salinity of the southern Sea of Azov was unusually high, and additional species were seen such as bluefish, turbot, chuco, spurdog, Black Sea salmon, mackerel and even corkwing wrasse, rock hopper, bullhead and eelpout. Unlike the Black Sea plankton which does not adapt well to the low salinity of the Sea of Azov and concentrates near the Kerch Strait, fishes and invertebrates of the Black Sea adjust well. They are often stronger than the native species, are used to the relatively low temperatures of the Black Sea and survive winter in the Sea of Azov well.