Crapet arlequin

The bluegill (Lepomis macrochirus), sometimes referred to as "bream," "brim," "sunny," or "copper nose" as is common in Texas, is a species of North American freshwater fish, native to and commonly found in streams, rivers, lakes, ponds and wetlands east of the Rocky Mountains. It is the type species of the genus Lepomis (true sunfish), from the family Centrarchidae (sunfishes, crappies and black basses) in the order Perciformes (perch-like fish). Bluegills can grow up to long and about . While their color can vary from population to population, they typically have a very distinctive coloring, with deep blue and purple on the face and gill cover, dark olive-colored bands down the side, and a fiery orange to yellow belly. They are omnivorous and will consume anything they can fit in their mouth, but mostly feed on small aquatic insects and baitfishes. The fish are important prey for bass, other larger sunfish, northern pike and muskellunge, walleye, trout, herons, kingfishers, snapping turtles and otters, and play a key role within the food chain of its freshwater ecosystem. A popular panfish among anglers, bluegill usually hide around and inside old tree stumps in swamps and other underwater structures (e.g. snags), and can live in either deep or very shallow water. Bluegills also like to find shelter among aquatic plants and in the shade of trees along banks, and will often move from one cover to another depending on the time of day or season. The bluegill is noted for the black spot (the "ear") that it has on each side of the posterior edge of the gills and base of the dorsal fin. The sides of its head and chin are commonly a dark shade of blue. The precise coloration will vary due to the presence of neurally controlled chromatophores under the skin. The fish usually displays 5–9 vertical bars on the sides of its body immediately after being caught as part of its threat display. It typically has a yellowish breast and abdomen, with the breast of the breeding male being a bright orange.

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Concepts associés (16)

Perchaude

La perchaude (Perca flavescens) est une espèce de poissons dulcicoles appartenant à la famille des percidés. Ubiquitaire en Amérique du Nord, elle s'adapte bien à toutes sortes d'habitats : grands lacs, petits étangs ou rivières tranquilles. L’origine probable de ce percidé serait des populations venues de l’Asie du Nord-est et qui auraient envahi l'Amérique du Nord durant le Pléistocène. La perchaude et la perche, considérées comme des espèces distinctes, possèdent une morphologie et des modes de vie équivalents.

Banc (poisson)

Un banc est un groupement important de poissons de la même espèce qui se déplacent ensemble, sans hiérarchie. Il correspond à un comportement d'agrégation. Le terme « banc » désigne surtout les groupements de poissons, mais par extension, il peut également désigner ceux de calmars, de copépodes, de méduses, etc. vignette|Banc de bécasses de mer thumb|Bancs de poissons rouges dans un plan d'eau douce. À la différence d'autres structures sociales, il n'existe aucune hiérarchie dans un banc : le poisson qui mène le groupe dans sa nage est simplement celui qui se trouve le plus à l'avant.

Centrarchidae

Les Centrarchidae sont une famille nord-américaine de poissons téléostéens, que l'on peut notamment trouver dans les étangs créés par le castor (Castor canadensis).

Extending the Concept of Predicting Fish Acute Toxicity In Vitro to the Intestinal Cell Line RTgutGC

Kristin Schirmer, Hannah Inka Schug, Jenny Maner

Testing chemicals for fish acute toxicity is a legal requirement in many countries as part of environmental risk assessment. To reduce the number of fish used, substantial efforts have been focused on alternative approaches. Prominently, the cell viability ...

SPEKTRUM AKADEMISCHER VERLAG-SPRINGER-VERLAG GMBH2020

Silver nanoparticles inhibit fish gill cell proliferation in protein-free culture medium

Kristin Schirmer, Laura Sigg, Renata Behra, Yang Yue

While short-term exposures of vertebrate cells, such as from fish, can be performed in defined, serum-free media, long-term cultures generally require addition of growth factors and proteins, normally supplied with a serum supplement. However, proteins are ...

Taylor & Francis Ltd2016

Toxicity of silver nanoparticles to a fish gill cell line: Role of medium composition

Kristin Schirmer, Laura Sigg, Renata Behra, Yang Yue

In aqueous solutions, silver nanoparticle (AgNP) behavior is affected by a variety of factors which lead to altered AgNP size and toxicity. Our research aims to explore the effect of media composition on citrate-coated AgNP (cit-AgNP) behavior and toxicity ...

Informa Healthcare2015