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Albinism is the "congenital absence of any pigmentation or coloration in a person, animal or plant, resulting in white hair, feathers, scales and skin and pink eyes in mammals, birds, reptiles, amphibians and fish and invertebrates as well. Albinism can reduce the survivability of an animal; for example, it has been suggested that albino alligators have an average survival span of only 24 hours due to the lack of protection from UV radiation and their lack of camouflage to avoid predators. Familiar albino animals include in-bred strains of laboratory animals rats, mice and rabbits , but populations of naturally occurring albino animals exist in the wild, e. Mexican cave tetra. Albinism is a well-recognized phenomenon in molluscs, both in the shell and in the soft parts.
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The most important pigments that determine plumage coloration in birds are melanines and carotenoids.
The latter are ingested in food and transformed into colour pigments by enzymes. Aberrations in this pigmentation are mostly caused by food deficiencies and usually do not have a genetic basis. Well-known examples are flamingoswhich owe their distinct pink colour to the presence of red carotenoids in their natural food.
When these carotenoids are in short supply, these birds appear white after the next moult. Mutations causing changes in carotenoid-based colour pigments are rare; melanine mutations occur much more frequently. Two types of melanin, eumelanin and phaeomelanin, are present in birds. In the skin and eyes, only eumelanin is present.
In some bird species, the colour is completely caused by eumelanin, however, both types of melanin are found in most species.
In birds, albinism has been defined as "a total lack of both melanins in feathers, eyes and skin as a result of an inherited absence of tyrosinase",  however, this ignores the effects of other pigments and structural colours. An albino bird has a white beak, white plumage, non-coloured skin, white talons and pink or red eyes. Albinism is only seen in about 1 of every 1, birds. The two most common species of albino birds are the common house martin and the American robin.
In one study, albinism in birds has been categorised according to the extent of pigment absence. However, it has been argued that the definition of albinism precludes the possibility of "partial albinism" in which a mostly white bird shows some form of melanin pigmentation.
As with other animals, it has been stated that for fish to be properly described as "albino", they must have a white body and pink or red eyes. Several types of aquarium fish are have "albino" in their names, e.
Zebrafish have three types of chromatophores-iridophores, melanophores, and xanthophores-which produce silver, black, and yellow pigmentation respectively.
Zebrafish that lack iridophores are known as roy mutantsthose that lack melanophores as albino mutantsand those which lack both melanophores and iridophores are ruby mutants. The gross eye morphology, feeding and swimming behaviours between wild-type and albino zebrafish were indistinguishable, except under dim or bright light or low contrast.
However, when tested, there was no differences in responses between wild-type and albinistic European wels catfish Silurus glanis and South American bronze catfish Corydoras aeneus. Similarly, Mexican blind cave fish Astyanax mexicanus do not differ in hearing sensitivity from the normally pigmented and eyed surface-dwelling populations.
Fish lack melanin in the inner ear, meaning that hearing in fishes is less likely to be affected by albinism than in mammals.
There are several reports of total albinism in both freshwater and marine fish, however, frequently captured albino fish are only reported in aquarium magazines and local newspapers. The incidence of albinism can be artificially increased in fish by exposing the eggs to heavy metals e. In the wild, albinism is reasonably common in the teleostsespecially the Pleuronectiformes flatfishhowever, it is rarely reported in the elasmobranchs. Albino and normally pigmented channel catfish Ictalurus punctatus differ in their characteristics.
Normal individuals of this species are superior to albinos in body weight and total length. Albinos crossed with other albinos require 11 days longer to spawn and produce smaller egg masses.
These masses contain eggs of lighter weight with poorer hatchability than crosses of normal fish. The albino fish have lower survival rates than normal fish but dress-out percentages are nearly equal. Some wild cave fish have populations that are albinistic.
The Mexican cave tetra is a species that has evolved specialized characteristics in a series of independent caves. One of these is albinism linked to the Oca2 gene, a known pigmentation gene, This trait has evolved independently in at least two caves.
In the class chondrichthyesseveral species of naturally occurring albino rays and sharks have been recorded. Furthermore, an albino individual spotted ratfish Hydrolagus colliei from the order Chimaeriformes has been reported. Albinistic individuals of the following shark species have been reported:  . A study published in reported albinistic individuals of the following ray species: . There are several reports of albino lampreys and it has been estimated that this occurs at a frequency of one innormal individuals.
Albinism in the African lungfish has been reported on at least two occasions. Many reptiles labeled as albino are, in fact, not completely lacking in all colour pigments.
They are actually amelanisticnot albino. Reptiles often possess at least two pigments. Among the most common are xanthin yellow and erythrin red. An amelanistic reptile therefore, may still have pale yellow, orange, or red pigmentation. The California Academy of Sciencein the Steinhart Aquariumas ofhas on display an albino American alligator named " Claude ".
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The alligator is partially blind because of lack of pigment in its eyes. This alligator would not have survived in the wild because its whiteness would have made it too easy a prey object. The only known albino alligators are in captivity.
However, most of these animals are leucistic given that they have a general loss of pigmentation with some color tinges remaining on their bodies although looking at first like other albino creatures, thus creating the misconception that the reptiles are albino themselves when they are not.
Four such alligators are kept at the Gatorland theme park in the U. In snakes, partial absence of pigment is more common than absolute albinism. For snakes that are usually patterned in colours, they appear as a faint blue, peach or yellowish.
In these cases, there has been a genetic mutation in the melanin and pigment delivery. The appearance comes from the inability for full colours to be present, such as black, red, brown and others.
The eyes of an albino snake are typically red or pink. Albino snakes can remain in the sunlight for several hours with minimal harm. Corn snakes and snakes of larger types, such as a boa or diamondback snakes, are the most commonly affected by albinism often appearing to be a pinkish or yellowish colour.
Albino tortoises and turtles are uncommon; Sulcata tortoises are the most likely type of turtle to express albinism. The shells have an almost yellow colouration and they have pink eyes. For turtles, a pure white colour is nearly impossible, even with albinism. Albino turtles can have a longer lifespan than many other albino animals; their hard shells help to prevent predation and other environmental challenges. Vision and sensory organs are slightly affected. An albino anole has been reported and photographed.
There are three known "albino" strains of leopard geckohowever, breeders state that albinos are generally recognized by their lack of black pigment and having red eyes is not a requirement to be considered an albino.
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These three strains are called "tremper albinos", "rainwater albinos" and "bell albinos". As with reptiles, many amphibians labeled as albino are, in fact, not completely lacking in all colour pigments. They are actually amelanistic, not albino.
Amphibians have six types of chromatophore in their skin, i. The incidence of albinism in frogs, salamanders, and newts is relatively higher than other taxa. It has been estimated that one in four hundred of these animals is albino. When albino tadpoles hatch, they are almost transparent. This may help camouflage them initially, however, after two weeks, when their hind legs begin to emerge, they become milky white. A survey in found hundreds of tiny albino plains leopard frogsbut when the researcher returned a few months later, not a single albino adult could be found.
In European Salamandridaealbinism has been recorded in the fire salamander Salamandra salamandragold-striped salamander Chioglossa lusitanicaItalian crested newt Triturus carnifexmarbled newt Triturus marmoratusIberian ribbed newt Pleurodeles waltlalpine newt Ichthyosaura alpestris and two sub-species of the smooth newt Lissotriton vulgaris vulgaris and Lissotriton vulgaris meridionalis.
Albinism in molluscs has been recognized to be a hereditary phenomenon at least since Sometimes an individual snail has a normally pigmented body, but the shell is completely without the normal pigmentation because of a defect in the cells of the mantle. Shells of certain mollusc species can be translucent when they lack the normal pigmentation.
An exhibit showing albino and normal specimens of nine local species of marine molluscs, both gastropods and bivalves The Bailey-Matthews National Shell Museum in Sanibel, Florida. Normal left and albinistic right forms of the land snail Pseudofusulus variansnote that in the albino both the body and the shell are lacking the normal pigmentation.
Albino freshwater snail Biomphalaria glabrata showing the red oxygen-transport pigment haemoglobin. Without its normal pigment, the shell of this species is translucent.
The neurohormone [His7]-corazonin induces darkening of the cuticle of Locusta migratoria. The Okinawa strain of this species is deficient in [His7]-corazonin and is albino.
One of the typical features of Locusta migratoria ia that they are gregarious locusts. However, the albino strain shows more solitarious behaviour. The yellow mutation in fruit flies is a mutation causing a congenital lack of normal pigment; it is a similar phenomenon to albinism in other organisms.
The Japanese sea cucumber Apostichopus japonicus is an echinoderm that is caught in the wild or cultivated for food. The upper side becomes a dull, yellowish -brown to maroon and the underside a light brown. The body walls of adult, albino Japanese sea cucumbers contain only 0. The difference in melanin content becomes visually apparent at 60 days of age. The epidermis is thinner in the albinos and contains fewer melanocytes. Albino individuals are similar to normal individuals in growth rate, digestion rate and fertility.
Astaxanthin is the main carotenoid in marine crustaceans and fish. It has been shown that adding astaxanthin to the feed can improve the skin and muscle colour of marine organisms and thereby increase their commercial and ornamental value.
This albinism does not affect mortality. In some animals, albinism-like conditions may affect other pigments or pigment-production mechanisms:. Plants that are pale simply from being in the dark are termed etiolated. Albino redwoods are rare examples of an albino tree with white needles; despite its lack of chlorophyll it may grow to substantial size as a parasiteusually on the base of the normal redwood tree from which it first grew.