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They take live prey up to the size of week-old guppy fry, but need plant material, ideally green algae, to thrive. They are ideal algae eaters for tanks with small, hard-water cichlids. If not enough algae are available, vegetables such as lettuce, spinach, or green peas are recommended additions to the diet.
In fish a countercurrent flow (lower diagram) of blood and water in the gills is used to extract oxygen from the environment. [6] [7] [8] All basal vertebrates breathe with gills. The gills are carried right behind the head, bordering the posterior margins of a series of openings from the esophagus to the exterior.
A fish's hypoxia tolerance can be represented in different ways. A commonly used representation is the critical O 2 tension (P crit), which is the lowest water O 2 tension (P O 2) at which a fish can maintain a stable O 2 consumption rate (M O 2). [2]
Guppies prefer a hard-water aquarium with a temperature between 25.5 and 27.8 °C (78 and 82 °F) and salt levels equivalent to one tablespoon per 19 L (5 US gal). [60] They can withstand levels of salinity up to 150% that of normal seawater , [ 61 ] which has led to them being occasionally included in marine tropical community tanks, as well ...
A sub-tropical and active species of shark that requires a tank with plenty of room to swim which will do better in circular and oval shaped tanks rather than rectangular ones. [70] It will jump out of uncovered aquariums. [70] 116 cm (45.7 in) [164] Brown smooth-hound: Mustelus henlei: No [70] Requires a minimum 1,200 gallon aquarium. [70]
A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.
This can be due to overeating, overconsumption, low water temperatures, bacterial infections, parasites, or other impaired organs affecting the bladder. [5] In these particular cases, the fish can end up with a distended belly, curved back, impaired swimming, or even death leaving them floating on top of the water. Typically a fish owner would ...
Prey usually have eyes on the sides of their head so they have a large field of view, from which to avoid predators. Predators usually have eyes in front of their head so they have better depth perception. [46] [47] Benthic predators, like flatfish, have eyes arranged so they have a binocular view of what is above them as they lie on the bottom.