The bigeye trevally, Caranx sexfasciatus (also known as the bigeye jack, great trevally, six-banded trevally and dusky jack), is a species of widespread large marine fish classified in the jack family Carangidae. The bigeye trevally is distributed throughout the tropical waters of the Indian and Pacific Oceans, ranging from South Africa in the west to California and Ecuador in the east, including Australia to the south and Japan in the north. The bigeye trevally is best distinguished by its colouration, having a dark second dorsal fin with a white tip on the lobe, and also possessing a small dark spot on the operculum. Other more detailed anatomical features also set the species apart from other members of Caranx. The species is known to grow to a length of 120 cm and 18 kg.
Pictures: Raja Ampat, Papua, Indonesia by Sami Salmenkivi
Needlefish is the family (Belonidae), but information on the different species cannot be found. But if you do know more, feel free to assist.
Needlefish (family Belonidae) are piscivorous fishes primarily associated with very deep marine habitats or the bottom of the open sea. Some genera include species found in marine, brackish, and freshwater environments (e.g., Strongylura) while a few genera are confined to freshwater rivers and streams, including Belonion, Potamorrhaphis, and Xenentodon. Needlefish closely resemble North American freshwater gars (family Lepisosteidae) in being elongate and having long, narrow jaws filled with sharp teeth, and some species of needlefish are referred to as gars or garfish despite being only distantly related to the true gars. Needlefish are in fact members of the Beloniformes and therefore most closely related to flying fish, sauries, and halfbeaks.
Picture: Pulau Redang, Malaysia by Sami Salmenkivi
The Great Barracuda is a species of barracuda. Its binomial name is Sphyraena barracuda. Great barracudas often grow over 6ft long. The great barracuda is a type of ray-finned fish.
Barracudas are elongated fish with powerful jaws. The lower jaw of the large mouth juts out beyond the upper. Barracudas possess strong, fang-like teeth. These are unequal in size and set in sockets in the jaws on the roof of the mouth. The head is quite large and is pointed and pike-like in appearance. The gill-covers do not have spines and are covered with small scales. The two dorsal fins are widely separated, with the first having five spines and the second having one spine and nine soft rays. The second dorsal fin equals the anal fin in size and is situated more or less above it. The lateral line is prominent and extends straight from head to tail. The spinous dorsal fin is placed above the pelvics. The hind end of the caudal fin is forked or concave. It is set at the end of a stout peduncle. The pectoral fins are placed low down on the sides. The barracuda swim bladder is large.
In general, the barracuda’s coloration is dark green or grey above chalky-white below. This varies somewhat. Sometimes there is a row of darker cross-bars or black spots on each side. The fins may be yellowish or dusky.
Barracudas appear in open seas. They are voracious predators and hunt using a classic example of lie-in-wait or ambush. They rely on surprise and short bursts of speed (up to 27mph (43 km/h)) to overrun their prey, sacrificing maneuverability. Barracudas are more or less solitary in their habits. Young and half-grown fish frequently congregate in shoals. Their food is composed almost totally of fishes of all kinds. Large barracudas, when gorged, may attempt to herd a shoal of prey fish in shallow water, where they guard over them until they are ready for another meal. (text source: wikipedia)
Picture: Cozumel, Mexico by Sami Salmenkivi
The Horse-eye Jack, Caranx latus, is a gamefish and minor commercial fish in the family Carangidae. It is also known as the Big-eye jack, and is similar in appearance to the Crevalle jack, although the head of a Horse-eye jack is not as blunt. Horse-eye jack are known to feed on smaller fish and on many invertebrates such as shrimp and crab.
Horse-eye jack are commonly found in the subtropical Atlantic ocean from Bermuda and the northern Gulf of Mexico south to Rio de Janero. In the Eastern Atlantic, they are found from St. Paul’s Rocks to Ascension Island and, rarely, the Gulf of Guinea. Horse-eye jack are pelagic. They can be found on reefs and off shore rigs. Juveniles can be found close to shore along sandy and muddy bottoms. Horse-eye jack are known to penetrate brackish water and can live in the mouths of some rivers. They are typically found in salt water up to 140m in depth [description: Wikipedia]
Picture: Cozumel, Mexico by Sami Salmenkivi