Tench grow relatively slowly as a rule, but favourable conditions of food and space have a good effect. Normally at one year they average around 1¼ in (3 cm), at two years 2½ in (6 cm), at three, when most males reach maturity they average 3¾ in (9.5 cm) and at four, when the majority of the females mature, the average is 5 in (12.5 cm).
Males that have matured possess a much thickened, strong ray in the external edge of the pelvic fins. This is not particularly distinct in the immature fish.
Tench are widely raised with carp in fish farms, although their poor growth rate makes them a long-term investment. Small local fisheries exist for wild fishes. Tench have considerable value as angler's fishes, particularly as they can be introduced to small, oxygen-deficient waters. Their hardiness and ability to live out of water for some hours helps with these introductions, but their slow growth detracts somewhat from their utility in restocking.