Fish and allied products' development, particularly crab culture, is on the rise with farmers more inclined to take this up, after aqua culture in the country. In addition, export of fish of octopus and jellyfish variety has also increased in the last few years as it has a good market in the south-east Asian countries. Participating in the inauguration of a molecular biology lab at the Central Institute of Fisheries Education (CIFE), Dr S. Ayyappan, deputy director general (DDG) of ICAR (fisheries), New Delhi, revealed details on Monday.