The aim of this paper is to present the current problems and possible solutions in the sustainable development of one of the branches of mariculture – tuna farming. Today, farming of tuna is based on three species: Atlantic bluefin tuna, pacific bluefin tuna and southern bluefin tuna, so peculiarities of capture-based farming and farming based on artificial spawning will be mentioned. Due to years of overfishing of these species, certain legal regulations came to force. The effects of these regulations on tuna fishing and farming will be provided. Farmed tunas are mostly traded in the Japanese delicacy sushi and sashimi, but in recent years there has been a growth in other markets. During the process of farming, from providing the seed material to harvesting on farms, certain environmental impacts are occurring. In Croatia, tuna farming is a relatively young activity, but with significant developmental capacities.