• Source: Great barracuda

Sphraena Barracuda
Sphyraena barracuda, commonly known as the great barracuda, is a species of barracuda: large, apex predator ray-finned fish found in subtropical oceans around the world. The Syphyraena family contains 27 species while the great barracuda is one of this genus.[19]




Distribution and habitat


The great barracuda is present in tropical to warm temperate waters, in subtropical parts of the Indian, Pacific, and Atlantic oceans. Primarily found in oceans near the equator, these Great Barracuda find refuge in mangrove areas to deep reefs, and seagrass beds, with a lower depth limit of 110 meters (360 ft).[17] Juveniles and small adults typically inhabit nearshore locations like mangrove and seagrass areas.[14] While adults a typically found offshore around artificial structures, reefs, and rock outcroppings.[13] These fish use these structures as a form of refuge.[13][14] Studies conducted by a research group tagging and monitoring these fish in the Bahamas concluded that a good amount of the population of Barracuda stays in their residential habitats for a long period. But a small portion of the population have traveled outwards, suggesting they are capable of large-scale migration.[12]




Description


Great barracudas are large fish, and one of the largest of the Barracudas. Mature specimens are usually around 60–100 cm (24–39 in) in length and weigh 2.5–9.0 kg (5.5–19.8 lb). Exceptionally large specimens can exceed 1.5 m (4.9 ft) and weigh over 23 kg (51 lb). The record-sized specimen caught on rod-and-reel weighed 46.72 kg (103.0 lb) and measured 1.7 m (5.6 ft), while an even longer example measured 2 m (6.6 ft). The largest great barracuda was said to have measured 3 m (9.8 ft).

The great barracuda is blue gray above, fading to silvery and chalky-white below. Sometimes, a row of darker crossbars occurs on its upper side, with black blotches on each lower side. The second dorsal fin and the anal and caudal fins range from dark violet to black with white tips.
In general, 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 that are unequal in size and set in sockets in the jaws and on the roof of the mouth. The head is quite large and is pointed and pike-like in appearance.




Behavior and biology



Barracudas appear in open seas. They are voracious predators and hunt by ambush. They rely on surprise and short bursts of speed up to 36 mph (57.9 km/h) to overrun their prey, sacrificing maneuverability. The position of the Barracudas’ dorsal and anal fin is in the posterior segment of its body. This is an evolutionary trait that allows the fish to move quickly and have an ambush attack style.[20] 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 9 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 situated above the pelvis. The hind end of the caudal fin is forked or concave, and it is set at the end of a stout peduncle. The pectoral fins are placed low down on the sides. The barracuda has a large swim bladder.
Barracudas are more or less solitary in their habits. Young and half-grown fish frequently congregate in shoals. The Great Barracuda captures small prey by the ram-capturing method. This is done by opening their mouth and engulfing the prey with just one bite. While with bigger prey, the ram capture method is still used. But requires multiple bites and lateral shaking of the head to reduce the prey to smaller pieces and move towards the anterior portion of the mouth to be eaten.[17]
Barracudas can reach at least 14 years of age. The spawning season lasts from April to October. Females can release about 5,000 to 30,000 eggs. The highest spawn rate occurs in July, August, and September then drops off in the months after especially in winter.[16] Studies conducted on Sphyraena Barracuda in Florida have found females reach sexual maturity as early as 1-2 years of age and 3-4 years in males.[14] Concluding that females reach maturity about 1 year earlier than males.[16]
The diets of these top predators of reefs are composed almost totally of fish, cephalopods, and occasionally shrimp. Their fish diet consists of killifishes, herrings, sardines, gobies, silversides, anchovies, small mullets, and lizardfishes, to name a few. Large barracudas, when gorged, may attempt to herd a school of prey fish in shallow water where they guard over them until they are ready for another hunt.




Relationship with humans


Barracudas are scavengers, and may mistake snorkelers for large predators, following them in hopes of eating the remains of their prey. Swimmers have been reported being bitten by barracuda, but such incidents are rare and possibly caused by poor visibility. Barracudas may mistake objects that glint and shine for prey.
Barracuda attacks on humans are rare, although bites can result in lacerations and the loss of some tissue. They are a popular target for recreational fishing, due to the strong fight they put up when hooked. However they are also known for the pungent odor they release upon being caught, and their meat has a chance of causing Ciguatera fish poisoning when eaten.




Conservation Status


Sphraena Barracuda are reportedly declining in Florida, and the Florida Fish and Wildlife Conservation Commission is considering imposing catch limits.[2] Studies have proven that fishing-related stressors can reduce the Barracuda’s physical capability of evading to a refuge for protection.[18] Having impaired cognitive or visual acuity limits their ability to locate their refuge areas, increasing their chances of predation.[18] There have been some instances of seeing and catching these Great Barracudas in areas outside their normal subtropical and tropical habitats, such as the Canadian oceans and the North-East Atlantic.[21] One can assume this can be caused by factors like global warming habitat destruction and other factors that could affect these fish to swim offshore toward new deeper waters seeking new refuge or prey.




References






External links



Data related to Sphyraena barracuda at Wikispecies
Media related to Sphyraena barracuda at Wikimedia Commons
Photos of Great barracuda on Sealife Collection

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