Tench

Fascinating facts about the Tench

• When Carl Linnaeus first named this fish in 1758, he called it *Cyprinus tinca*, a reminder that the tench’s scientific identity has been reshaped more than once, from a carp to its own family, Tincidae, in 1878. That taxonomic journey shows how a seemingly ordinary pond dweller can rewrite the tree of life.
• A single tench can lay up to 300,000 sticky green eggs in shallow, plant-laden water each summer, turning a quiet lake bottom into a bustling nursery. This massive output explains why the species can bounce back quickly after local declines.
• Weighing as much as 6.9 kg (15 lb 3.4 oz) in a record catch from England in 2001, tench can grow far beyond the average 0.11 kg (0.25 lb) they reach in their first year, highlighting a growth spurt that rivals many larger freshwater fishes.
• Tench thrive where oxygen is low enough to choke out carp, often hiding in muddy, vegetated waters.
• Folklore called tench “doctor fish,” believing any sick fish rubbing against their slime would heal.

At a glance

About the Tench

The tench (Tinca tinca) glides through the quiet, mud-laden waters of Europe and Asia with a stocky, carp-like silhouette cloaked in olive-green skin that darkens above and turns almost golden below. Its square tail and rounded fins betray a design for slow, deliberate movement, while a narrow mouth equipped with tiny barbels at each corner hints at a nocturnal forager. Beneath its slippery, eel-like surface lie minuscule scales embedded in thick skin, a feature that has birthed the folklore of the “doctor fish” – a slime believed to cure any ailing fish that brushes against it. Tench favour still lakes, lowland rivers and brackish lagoons where clay or mud settles and vegetation flourishes, thriving where oxygen is low enough to exclude even hardy carp. By night they sift the soft substrate for chironomid larvae, snails and pea clams, their diet shifting to animal prey in eutrophic waters and to plant matter when vegetation is abundant. Reproduction unfolds in shallow, plant-laden shallows during summer, with females laying up to 300,000 sticky green eggs that cling to submerged stems, and juveniles can reach a quarter-pound within their first year, a testament to their rapid growth. Males stand out with larger, curved pelvic fins that extend beyond the anus and a thickened outer ray on the ventral fin, while females grow substantially larger, sometimes surpassing seven kilograms. Though the record tench caught in England in 2001 weighed a hefty 6.899 kg, most individuals remain far smaller, rarely exceeding three kilograms in males. Their small, red-orange eyes scan the dim waters, and their presence in ponds as ornamental golden tench adds a splash of pale gold to tranquil garden settings. Yet beyond their culinary potential and role as bottom-feeders that help keep waterways clean, the tench remains a quiet sentinel of slow-moving habitats, its unassuming form concealing a resilience that allows it to thrive where many others cannot…

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