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The family Argulidae, whose members are commonly known as carp lice or fish lice, are parasitic crustaceans in the class Ichthyostraca. It is the only family in the monotypic subclass Branchiura and the order Arguloida , although a second family, Dipteropeltidae, has been proposed.
They are bottom feeders, feeding mostly on invertebrates, such as crustaceans, insect larvae, and fish eggs. Some other fish species, like white sucker in turn eat their eggs. Lake trout, northern pike and burbot are natural predators. Other common names of the round whitefish are Menominee, pilot fish, frost fish, round-fish, and Menominee ...
The larvae are then carried to sea on the outgoing tide where they join the ocean's plankton. [18] After approximately six months, the juvenile fish migrate back into freshwater habitats where they mature to adulthood. The four other galaxiid species in New Zealand whitebait are the kōaro, banded kōkopu, giant kōkopu and shortjaw kōkopu. [22]
It has a bluish-grey body with a saturated black spot on the tip of the dorsal fin. The snout length is 62.5-66.7% of the eye diameter, and the lower jaw has a concave dorsal edge that does not protrude beyond the upper jaw. It has 12-13 rays in the pectoral fin, 50-52 scales in the lateral line, and 53-54 vertebrae.
The fish's suckermouth, with its fleshy lips, is located in an inferior position at the bottom of its head, as the fish obtains its food from bottom surfaces. [5] The white sucker is often mistaken for different species of suckers and redhorses, but can be distinguished by the complete lateral line system containing 55–85 small scales. [6]
The White-ear changes colour as it grows but always has a white mark on its 'ear'. Young juveniles are brightly coloured but as the fish grows the colours fade to the adult colouration of yellowish-brown to grey or black".
The drum typically weighs 5–15 lb (2.3–6.8 kg). The world record was caught on Nickajack Lake in Tennessee, and weighed in at 54 lb 8 oz (24.7 kg). [12] The freshwater drum is frequently gray or silvery but may be more bronze or brown colored, common in the Lake Erie population.
The eyes of Winteria telescopa differ slightly from those of other opisthoproctids by their more forward-pointing gaze.. Barreleyes, also known as spook fish (a name also applied to several species of chimaera), are small deep-sea argentiniform fish comprising the family Opisthoproctidae found in tropical-to-temperate waters of the Atlantic, Pacific, and Indian Oceans.