Carp farming has a long history and most of the carp stocked into UK fisheries are produced in controlled conditions.
The farming process can be split into two basic phases. The first is the hatchery where the brood fish are spawned and the eggs and fry are produced, and the next phase is the on-growing process which is happens in ponds.
In this first of two articles I will look at the how the carp are spawned and the eggs produced.
Brood fish are generally four years old and have developed gonads which are ready to spawn. In the wild, this is governed by temperature. For farming, the process needs to be more timely and so a hormone is used to induce them to spawn.
This means that the whole process is more predictable and fish held in warm water all year round can be spawned at any time throughout the seasons.