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A peculiar function of pectoral fins, highly developed in some fish, is the creation of the dynamic lifting force that assists some fish such as sharks in maintaining depth and also enables the "flight" for flying fish. Certain rays of the pectoral fins may be adapted into finger-like projections, such as in sea robins and flying gurnards.
It is a fast-swimming fish with a prominent lateral keel and four to six finlets after the anal and second dorsal fins. [3] Escolar can grow to over 2 metres (7 ft) in length. Like its relative the oilfish ( Ruvettus pretiosus ), escolar cannot metabolize the wax esters (gempylotoxin) naturally found in its diet.
The pectoral fins are thin and threadlike, while the pelvic fins are somewhat larger, and set far back. The fins are connected to the shoulder by a single bone, which is a marked difference from most fish, whose fins usually have at least four bones at their base; and a marked similarity with nearly all land-dwelling vertebrates. [24]
This measurement excludes the length of the caudal (tail) fin. [1] Total and fork length of a fish. Total length (TL) is the length of a fish measured from the tip of the snout to the tip of the longer lobe of the caudal fin, usually measured with the lobes compressed along the midline. It is a straight-line measure, not measured over the curve ...
Sarcastic fringeheads can be up to 30 centimetres (12 in) long, [6] elegant and slender, [2] and are mostly scaleless with great pectoral fins and reduced pelvic fins. The swimming movements of these fish mainly consist of short, dart-like movements. [7] Their body coloration varies from warm brown to gray with a blotchy appearance. [8]
The maximum total length may possibly exceed 3 m (9.8 ft) with a maximum weight of over 200 kg (440 lb). [13] Such lengths are rare and unproven during the last century, but there is a somewhat credible report from the 19th century of a wels catfish of this size.
It is a smaller fish than the Yucatan molly (P. velifera), though that species often does not grow to full length if bred in an aquarium. The dorsal fins are the most distinctive character: Those of the sailfin molly have less than 15 fin rays , counting where the fin meets the back, whereas the Yucatan molly has 18–19 (intermediate numbers ...