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For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]
Asian carp is an informal grouping of several species of cyprinid freshwater fishes native to Eurasia, commonly referring to the four East Asian species silver carp, bighead carp, grass carp (a.k.a. white amur) and black carp (a.k.a. black amur), [note 1] which were introduced to North America during the 1970s and now regarded as invasive in the United States.
A nature style aquascape, suggesting mountains. A contrasting approach is the "nature aquarium" or Japanese style, introduced in the 1990s by Takashi Amano. [1] Amano's three-volume series, Nature Aquarium World, sparked a wave of interest in aquarium gardening, and he has been cited as having "set a new standard in aquarium management". [9]
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.
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There is a black blotch on the spiny part of the dorsal fin between the third and sixth spines and the tail is striped with a black tip to each lobe. This species sexual maturity after attaining a total length of 13 centimetres (5.1 in), they are most commonly recorded at total lengths of around 25 centimetres (9.8 in) and the longest recorded ...
The peaceful betta or crescent betta (Betta imbellis) is a species of gourami native to Southeast Asia. Betta imbellis has a pair of suprabranchial chambers that each house a labyrinth organ , a complex bony structure lined with thin, highly vascularised respiratory epithelium .
The crescent gunnels likely eats marine worms as well as small species of crustacean. [1] It is an important prey item for larger vertebrate predators and these include great blue heron ( Ardea herodias ), pigeon guillemot ( Cepphus columba ), North American river otter ( Lontra canadensis ), American mink ( Mustela vison ), and larger fishes.