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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 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]
This species, which can range up to 0.45 m (1.5 ft) in length and weigh 1.5 kg (3.3 lb), is sometimes commercially fished. [77] [92] Characins (Characiformes) The largest species is the African freshwater fish, the giant tigerfish (Hydrocynus goliath). The top size of this fish is 1.5 m (4.9 ft) and 50 kg (110 lb).
Invariably, b is close to 3.0 for all species, and c is a constant that varies among species. [9] The coefficient c and the exponent b are found by fitting an equation of this form to measured weight-length data. For some fish, including spotted seatrout, the weight-length relationships vary with the seasons and with gender. [6]
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] As channel catfish grow longer, their weight increases. The relationship between length and weight is not linear.
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.
Recreational angling is a large market throughout the world and the black marlin is a very sought after fish. In August 1953, while fishing off of Cabo Blanco, Peru, Alfred C. Glassell Jr. caught a black marlin weighing 1,560 pounds (710 kg), using a handheld 7 foot (2.1 m) bamboo rod, a Fin-Nor reel and 130-pound-test linen line. [23]
The largest of the ants, and the heaviest species of the order, are the females of the African Dorylus helvolus, reaching a length of 5.1 cm (2.0 in) and a weight of 8.5 g (0.30 oz). [1] The ant that averages the largest for the mean size within the whole colony is a ponerine ant, Dinoponera gigantea , from South America, averaging up to 3.3 cm ...