Come identificare Dogtooth Tuna

Per identificare Dogtooth Tuna (Gymnosarda unicolor), osserva queste caratteristiche chiave.

Caratteristiche fisiche

Forma del corpo

torpedo

Colorazione

Dorsally iridescent dark blue to black, fading to silvery-white on the flanks and belly. Fins are generally dark.

Tipo di squame

none

Posizione della bocca

terminal

Caratteristiche distintive

Large, conical, dog-like teeth in both jaws, visible even when the mouth is closed., Body largely scaleless, except for a well-developed corselet of scales around the pectoral fin and lateral line., Absence of finlets between the second dorsal and anal fins and the caudal fin (a key distinguishing feature from true tunas)., Relatively long pectoral fins., A prominent lateral line that dips sharply below the second dorsal fin.

Pinna dorsale

Two dorsal fins; the first is spiny and relatively short, followed by a much taller, soft-rayed second dorsal fin. No finlets.

Pinna caudale

Deeply forked caudal fin, characteristic of fast-swimming pelagic fish.

Pinna pettorale

Relatively long and pointed, extending beyond the origin of the first dorsal fin.

Pinne distintive

Absence of finlets, which is unusual for a scombrid of this size and shape, and a key identifier.

Consigli per l'identificazione

1. 1

   Teeth

   Look for the prominent, conical, dog-like teeth, which are a definitive characteristic and give the fish its common name.

2. 2

   Scales

   Observe the body for a lack of scales, except for the corselet around the pectoral fins. Most other tuna species have more extensive scaling.

3. 3

   Finlets

   Note the absence of finlets behind the second dorsal and anal fins, a feature that distinguishes it from true tunas (genus Thunnus) and other scombrids like skipjack tuna.

4. 4

   Body Shape

   Its robust, torpedo-shaped body is typical of fast-swimming predators, but the other features are more diagnostic.

Esplora Dogtooth Tuna