Htc Re underwater camera Test and Catfish Science

Опубликовано: 01 Сентябрь 2017
на канале: SciGo

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Htc Re underwater camera Test and Catfish Science
Catfish (or catfishes; order Siluriformes or Nematognathi) are a diverse group of ray-finned fish.
Named for their prominent barbels, which resemble a cat's whiskers, catfish range in size and behavior
from the three largest species, the Mekong giant catfish from Southeast Asia, the wels catfish of Eurasia
and the piraíba of South America, to detritivores (species that eat dead material on the bottom), and even to a
tiny parasitic species commonly called the candiru, Vandellia cirrhosa. There are armour-plated types and there are
also naked types, neither having scales. Despite their name, not all catfish have prominent barbel. Members of the
Siluriformes order are defined by features of the skull and swimbladder. Catfish are of considerable commercial importance;
many of the larger species are farmed or fished for food. Many of the smaller species, particularly the genus Corydoras,
are important in the aquarium hobby. Many catfish are nocturnal,[3][4] but others (many Auchenipteridae) are crepuscular or
diurnal (most Loricariidae or Callichthyidae for example).
The name catfish refers to the long barbels, or feelers, which are present about the mouth of the fish and resemble
cat whiskers. All catfishes have at least one pair of barbels, on the upper jaw; they may also have a pair on the snout and
additional pairs on the chin. Many catfishes possess spines in front of the dorsal and pectoral fins. These spines may be associated
with venom glands and can cause painful injuries to the unsuspecting. All catfishes are either naked or armoured with bony plates;
none has scales.

Living catfishes constitute nearly 2,900 species placed in about 35 families. The majority of species inhabit fresh water,
but a few, belonging to the families Ariidae and Plotosidae, are marine. Freshwater catfishes are almost worldwide in distribution
and live in a variety of habitats from slow or stagnant waters to fast mountain streams; marine catfishes are found in the shore
waters of the tropics. Catfishes are generally bottom dwellers, more active by night than by day. Most are scavengers and feed on
almost any kind of animal or vegetable matter. All species are egg layers and may exhibit various types of parental care.
The brown bullhead (Ictalurus nebulosus), for example, builds and guards a nest and protects its young, while male sea catfishes
(Ariidae) carry the marble-sized eggs, and later the young, in their mouths.

Reference:

https://en.wikipedia.org/wiki/Catfish

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