Come identificare Atlantic Bluefin Tuna

Per identificare Atlantic Bluefin Tuna (Thunnus thynnus), osserva queste caratteristiche chiave.

Caratteristiche fisiche

Forma del corpo

torpedo

Colorazione

Dorsal side is dark metallic blue to black, fading to iridescent silver on the flanks and silvery-white on the ventral side. Finlets are typically yellow with dark edges. The caudal keel is black.

Tipo di squame

cycloid

Posizione della bocca

terminal

Caratteristiche distintive

Robust, fusiform body, tapering to a narrow caudal peduncle., Two dorsal fins, the first spiny and depressible into a groove, the second soft-rayed and followed by 8-10 finlets., Anal fin also followed by 7-9 finlets., Pectoral fins are relatively short, not reaching beyond the interspace between the first and second dorsal fins., Large eyes and a moderately pointed snout., Small scales covering the entire body, but larger and more prominent in the corselet region (around the pectoral fins and anterior body)., Possesses a well-developed circulatory system and counter-current heat exchange mechanism (rete mirabile) allowing for regional endothermy.

Pinna dorsale

Two dorsal fins; the first is spiny (12-14 spines) and depressible, the second is soft-rayed (13-15 rays) and taller than the first. Followed by 8-10 yellow finlets with dark edges.

Pinna caudale

Deeply forked (lunate) caudal fin, highly efficient for sustained high-speed swimming. Features a prominent central keel and two smaller keels on the caudal peduncle.

Pinna pettorale

Relatively short, typically less than 20% of fork length, not extending past the interspace between the first and second dorsal fins. (29-34 rays).

Pinne distintive

Anal fin (13-16 rays) is similar in shape to the second dorsal fin and is followed by 7-9 yellow finlets with dark edges. Pelvic fins are small and located ventrally.

Consigli per l'identificazione

1. 1

   Size

   Can reach lengths of over 3 meters (10 feet) and weights exceeding 600 kg (1,300 lbs), making it one of the largest bony fish. Average adult size is around 2 meters (6.5 feet) and 250 kg (550 lbs).

2. 2

   Coloration

   Distinctive dark metallic blue to black dorsal side, silvery flanks, and white belly. Yellow finlets with dark margins are a key identifier.

3. 3

   Pectoral Fin Length

   Relatively short pectoral fins, not extending beyond the interspace between the first and second dorsal fins. This is a crucial distinguishing feature from other tuna species.

4. 4

   Caudal Keel

   A prominent black caudal keel on the side of the caudal peduncle, flanked by two smaller keels.

5. 5

   Body Shape

   Robust, thick-bodied, and fusiform, indicative of its powerful swimming capabilities.

Esplora Atlantic Bluefin Tuna