For example, if a person pulls on a rope with a force of 80 n and another person pulls on the same rope in the opposite direction with a force of 80 n, the vector sum of the two forces is zero and the system is in equilibrium.
The Most Expensive Fish in the World bluefin tuna. The most expensive fish that was caught off the coast of northern Japan, was among 570 put up for auction. Japan is the worldâs biggest consumer of seafood, with Japanese eating 80% of the Atlantic and Pacific bluefins caught. The two tuna species are the most sought after by sushi-lovers.
Humphead wrasse is one of the most valuable fish in the live reef fish trade, and the rarity of this species leads to higher demand and prices of up to US$250-300/kg in China.Although centred in Hong Kong, this trade has spread to southern China and other consumer regions, including Singapore. The species cannot be artificially cultured in hatcheries so there is no option to relieve fishing pressure. 2  Concerns for the future of the humphead wrasse are so high that it is the only reef fish protected by species name across a range of countries.