Sygnathoides
The Pacific seaweed pipefish (Syngnathus schlegeli) is a species of pipefishes, found in the north-western Pacific Ocean: near Vladivostok (Russia), southern to Gulf of Tonkin. Marine, oceanic demersal fish, up to 30.0 cm length. Common in the zostera growth.A dorsal fin is always present, and is the principal (in some species, the only) organ of locomotion. The ventral fins are constantly absent, and the other fins may or may not be developed. The gill openings are extremely small and placed near the upper posterior angle of the gill cover.Many are very weak swimmers in open water, moving slowly by means of rapid movements of the dorsal fin. Some species of pipefish have tails that are prehensile, as in seahorses. The majority of pipefishes have some form of a caudal fin (unlike seahorses), which can be used for locomotion. See fish anatomy for fin descriptions. There are species of pipefish with more developed caudal fins, such as the group collectively known as flagtail pipefish, which are quite strong swimmers.
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