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The crocodile icefish or white-blooded fish comprise a family (Channichthyidae) of notothenioid fish found in the Southern Ocean around Antarctica. They are the only known vertebrates to lack hemoglobin in their blood as adults. [ 2 ]
The ocellated icefish (Chionodraco rastrospinosus) is a fish of the family Channichthyidae. [3] [4] It lives in the cold waters off Antarctica and is known for having transparent haemoglobin-free blood. [5] [6] C. rastrospinosus live in the Southern Ocean up to a depth of 1 km. They are most commonly found on the seabed at 200–400 m.
In most cases, if these triggers were not present, male and female fish would not meet at the right stage and the number of offspring would be reduced. However, many fish do not respond to specific spawning triggers and will breed either constantly (e.g., guppies ); at specific times of the year (e.g., grunion ); or only at a certain point in ...
The following is a list of aquarium diseases. Aquarium fish are often susceptible to numerous diseases, due to the artificially limited and concentrated environment. New fish can sometimes introduce diseases to aquaria, and these can be difficult to diagnose and treat. Most fish diseases are also aggravated when the fish is stressed.
This makes it an ideal fish for keeping in an unheated aquarium in cold climates. In fact, White Clouds are more active and healthier when kept at temperatures lower than those at which most tropical tanks are kept. Water hardness should be from 5 to 19, and pH levels should range between 6.0 and 8.0. Also, the aquarium should have a top.
Chrysiptera parasema is a popular fish in the saltwater aquarium hobby. Because of its usually low price it is often recommended as a way for novice marine aquarium keepers to gain experience. [ 4 ] Though these hardy fish are sometimes used to cycle a tank, aquariums discourage against this practice, encouraging the use of live rock instead. [ 5 ]
The mouth itself is subterminal to inferior (on the lower portion of the head), and the adults possess no teeth. [7] The gizzard shad also has 90 to 275 gill rakers along the lower limbs. [ 4 ] Their ventral (pelvic) fins are in the thoracic position, or in the chest region of the fish.
All aquarium fish are wild-caught; they have not yet been successfully bred in captivity. Spawning and hatching in captivity has been observed, but no hatchlings have been reported to survive to adulthood. [5] [19] They are inquisitive, peaceful, and have some "personality". Although nocturnal, reedfish will sometimes come out during the day.