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The condition index in fish is a way to measure the overall health of a fish by comparing its weight with the typical weight of other fish of the same kind and of the same length. The condition index is its actual weight divided by its expected weight, times 100%. A fish of normal weight has a condition index of 100 percent.
The top size of this fish is 1.5 m (4.9 ft) and 50 kg (110 lb). [93] [94] Among the largest of the characin family is the popular sport-fish, the golden dorado (Salminus brasiliensis), which can reach up to 1 m (3.3 ft) in length and weigh 31.4 kg (69 lb). [95] Among the characins are the infamous neotropical piranhas.
The crevalle jack is one of the largest members of Caranx, growing to a known maximum length of 125 cm and a weight of 32 kg, [6] although it is generally uncommon at lengths greater than 65 cm. [10] Unverified reports of fish over 150 cm may also be attributable to this species. [11]
It has been observed up to a size of 152 centimetres (60 in) and a confirmed weight of 39 kilograms (86 lb), with unconfirmed reports of fish weighing more than 50 kilograms (110 lb). [3] [4] It is spotted in various shades of gray. The lingcod is a popular eating fish and is thus prized by anglers.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups. Ambiguous common names are accompanied by their possible meanings. Scientific names for individual species and higher taxa are included in parentheses.
Weight vs. length for channel catfish, where b = 3.2293 and = cm [15] An average adult channel catfish measures at least 12 inches (30 centimeters) long, and weighs between 2 and 4 pounds. The largest specimen on record weighed 58 pounds and was caught in 1964 by an angler in South Carolina. [16]
While other teleost fish typically utilize 27–50% of the oxygen in the water, the tuna's utilization rates have been observed as high as 50-60%. This overall high oxygen uptake works in close coordination with a well-adapted circulatory system to meet the high metabolic needs of the southern bluefin tuna.
Takifugu, also known by the Japanese name fugu (河豚, lit. "river pig"), is a genus of pufferfish with 25 species, most of which are native to salt and brackish waters of the northwest Pacific, but a few species are found in freshwater in Asia or more widely in the Indo-Pacific region.