Mendelian laws in aquaculture and cuniculture: simple and efficient

Many aquarists, fish or rabbit breeders have at their disposal for reproduction heterogenicpopulations as a result of segregation, or due to crossbreeding. In many cases, they must buy newbrood stock every 2-3 years due to the fact their old brood stock degenerates visible after severalgenerations. The aim of this paper is to underline that there are some low cost and easy to understandprinciples available with application in animal improvement and production. Color, size and shape areimportant traits when we describe a product as a phenotypically uniform line, strain or breed, e.g. thealbino African catfish, the red eyed swordtail, the Red Blond guppy, the large chinchilla rabbit, the NewZealand white rabbit. A standardized color, shape and size describe better an animal population andthus the said product is promoted better on the market. Two simple examples of applications will bepresented in this paper, the case of purification and maintaining of thermo-resistant guppy fish, andthe principle of improvement of body size and maintaining the color pattern in Transylvanian Giantrabbit. The key to success is to know what is (are) the recessive gene(s) for every relevant locus.