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Prey selection also varies between species as head and mandible size dictate maximum prey size. [3] Huge swarms of Chaoborus edulis, resembling distant plumes of smoke over Lake Malawi's water. Their main predator is fish, which can cause a behavioral response due to light factors influenced by their presence.
It has an olive-brown back with light silvery sides and underside and its length is generally between 9 and 19 inches (23 and 48 cm). 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.
The lake whitefish is sometimes referred to as a "humpback" fish due to the small size of the head in relation to the length of the body. [3] [a] It is a valuable commercial fish, and also occasionally taken by sport fishermen. Smoked, refrigerated, vacuum-packed lake whitefish fillets are available in North American grocery stores.
The larvae are similar in overall form to the related gargoyle cusk, but have elongated 3rd, 4th, and 5th pectoral-fin rays. [8] The bony-eared assfish is by some sources believed to have the smallest brain-to-body weight ratio of any vertebrate. [9] [dubious – discuss]
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.
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.
Siganus fuscescens is a schooling species and is a mostly diurnal fish. The juveniles have a diet dominated by filamentous algae while the adults prefer leafy algae and sea grass. [2] When they arrive on coral reef flats, the larvae aggregate in schools with a normal size of 200 individuals, but may hold as many as 5,000.
At this point, the larvae usually have long forward-facing pointy teeth. As the larvae grow larger, the teeth will be replaced by shorter teeth and will increase in number. The maximum size larvae reach varies from about 5–10 centimetres (2–4 in) but can be as large as 30 centimetres (12 in) or more depending on the species.