FINS.
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rays, the outer of which is frequently osseous. In some small groups of fishes, like the Gobies, the fins coalesce and form a suctorial disk.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Study_of_Fishes-Fig_6.png/360px-Study_of_Fishes-Fig_6.png)
Fig. 6.—Salmo salar (Salmon), with abdominal ventral fins.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Study_of_Fishes-Fig_7.png/360px-Study_of_Fishes-Fig_7.png)
Fig. 7.—Mullus barbatus (Red Mullet), with thoracic ventral fins.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Study_of_Fishes-Fig_8.png/360px-Study_of_Fishes-Fig_8.png)
Fig. 8.—Burbot (Lota vulgaris), with jugular ventral fins.