rayless dorsal fin

rayless dorsal fin: adipose fin (a small fleshy fin lacking rays or spines but reinforced by actinotrichs posterior to the soft dorsal fins (rarely a hard ray or a few soft rays may be developed in the adipose fin of certain catfishes), e.g. in Salmonidae, Osmeridae, Argentinidae, Myctophidae, Ictaluridae, Percopsidae)

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adipose fin — noun Zoology a small, rayless, fleshy dorsal fin present in certain fishes, notably in the salmon family … English new terms dictionary
adipose fin — noun : a soft fleshy rayless modification of the posterior dorsal fin found in certain fishes (as salmons, characins, and typical catfishes) … Useful english dictionary
Fish anatomy — The anatomy of fish is primarily governed by the physical characteristics of water, which is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs light more than air does. Body (1) operculum (gill cover), (2)… … Wikipedia
Swamp eel — Taxobox name = Swamp eels image width = 240px image caption = Monopterus albus regnum = Animalia phylum = Chordata classis = Actinopterygii ordo = Synbranchiformes subordo = Synbranchoidei familia = Synbranchidae subdivision ranks = Genera… … Wikipedia
finlet — noun Small rayless non retractable fins between the last dorsal or anal fin and the caudal fin of some fishes … Wiktionary

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