I have no doubt that this is the earliest example of a three fin Fish

Pelvic fin locomotor function in fishes: three-dimensional ..
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B. One of the first groups of fish to appear were the lobefin fish. There are threegroups of lobefin fish that are relevant to the story of the evolution of theamphibians - Coelocanths, Lung-Fish, and Panderichtyids. Of these thePanderichtyids are the ancestors to the amphibians. But they are all extinct. So welook to their still-living relatives the Coelocanths and the Lung-Fish for clues aboutthe biology of the ancestors to amphibians.
Pelvic fin locomotor function in fishes: three ..
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Fish use multiple fins, so it is possible that a given fin can have a hydrodynamic interaction with another fin. In particular, the fins immediately upstream of the caudal (tail) fin may be proximate fins that can directly affect the flow dynamics at the caudal fin. In 2011, researchers using techniques were able to generate "the first instantaneous three-dimensional views of wake structures as they are produced by freely swimming fishes". They found that "continuous tail beats resulted in the formation of a linked chain of vortex rings" and that "the dorsal and anal fin wakes are rapidly entrained by the caudal fin wake, approximately within the timeframe of a subsequent tail beat". Jul 9, 2005 - reconstruction of three lobe-fin fishes ..
Photo provided by FlickrJul 9, 2005 - reconstruction of three ray-fin fishes Lepidotes ..
Photo provided by FlickrBlack fish, three fin vs. one - Stand Up Zone
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The purpose of this study was to measure the total lipid and cholesterol content and fatty acid profile of chinook salmon (Oncorhynchus tshawytscha), Dover sole (Microstomus pacificus), and sablefish (Anoplopoma fimbria). All three species of fish were caught off the coast of Oregon in late summer 1987. Salmon contained 6.95% total lipid, Dover sole contained 1.03%, and sablefish contained 5.72%. For the fatter fish these values were considerably lower than the average values found in literature. The two fatter fish contained approximately 1 g of n-3 fatty acids per 100 g wet weight, again lower than the average values found in literature. This study demonstrates the need to increase the information available about seasonal variation in lipid content of finfish so that accurate dietary recommendations can be made.The Surf Systems Broomtail Fish (no crack), circa 1971, was routinely produced as a single with PressLock side bites.(3 fins) It was also produced as a Surfboards Hawaii twin fin, The Gemini model, to compliment the Aquarius model of the period. I have no doubt that this is the earliest example of a three fin Fish.In modern sharks the fin base is reduced to only three basal cartilages which narrow at the base to allow for a pivoting action, a type of fin movement not seen in some ancient fish.Deep-bodied fishes with an acanthopterygian fin distribution are traditionally considered more maneuverable than fishes with a fusiform body and less derived fin positions. One measure of fish maneuverability is the ability to make yawing turns. Goldfish (), silver dollars (), and angelfish () were induced to swim through narrow tubes bent at angles of 0°, 45°, 90°, 135°, and 180°. These three species represent a range of body form and fin position from goldfish (fusiform body and less derived ventral placement of the paired fins) through silver dollar (deep body and the same fin positions as goldfish) to the acanthopterygian angelfish (deep body and lateral pectoral fins). The minimum width of tubes through which the fish could pass a bend increased with angle for all species and among species in the order goldfish