Our yearly production of perch fingerlings is based on four out-of-season breeding populations that ensures four productions a year. Each spawning population has its own yearly cycle controlled by light and temperature. This system ensures that we have spawning in February, May, August and November.
As each production last three months (from hatching until the perch fingerlings reach two grams), we have 2 gram perch fingerlings available for sale in the Winter, Spring, summer and Fall.
During the spawning seasons we have developed techniques that allows us to strip semen and eggs from the mature perch. This enables us to control matings and ensure high fertilization rates.
Before incubating all eggs are disinfected with iodine. During incubation profylactic disinfection protocols are used to keep fungus and bacterial loads to a minimum which ensures us little loss of embryos and thus high hatching rates.
Two days after hatching we start feeding our perch larvae with Artemia in 1 meter tanks with a upwelling system. Our feeding strategy is based on a principle on reduced competition for feed ensuring that all larvae are feed while keeping feed waste to a minimum. The results are reduced size differences, reduced cannibalism, less stress among the larvae and thus better performing fish.
After three weeks feeding with live artemia, our perch larvae are moved from the hatchery to the nursery. Here, the weaning process starts to adapt the larvae to eat dry feed instead of artemia. This is a crucial step for the perch larvae. At PROPERCH we have put emphasis on adjusting our protocol over the last 10 years to ensure a smooth transition with little loss of larvae. After the transition our perch larvae are grown for two more months before the reach a size of 2 grams. To ensure our clients a high-quality product our perch are sorted for swim bladder inflation and deformities. They are continuously size sorted to reduce cannibalism ensuring our customers a delivery of even sized perch fingerlings with reduced stress and improved growth performance during on-growing. Finally, each production batch is tested for perch rhabdovirus to ensure our customers with a safe product.
Sustainability and biosecurity
At PROPERCH we strive to ensure a high quality product to our customers that is a sustainable produced and that is veterinary safe. We continuously collaborate with the industry and universities to test and develop new feeds and protocols that improve these core parameters.
Compared to other animal protein, fish has a low environmental impact and therefore represents a sustainable choice of protein. Where wild fisheries is a limited and overexploited resource that is unable to meet the increasing demand for food, aquaculture continues to expand. The blue revolution refers to the intensive growth within this sector. In order to ensure a sustainable production in the future where the environmental impact of aquaculture production is minimized, expansion must be done in controlled systems. Our perch is produced in indoor Recirculated Aquaculture Systems (RAS). It is a closed system where the environment is controlled, and water is cleaned and recycled. Therefore, RAS is a sustainable alternative to other production forms ensuring a safe and environmentally friendly production.
Veterinary safe production
PROPERCH has a high veterinarian standard. Our four brood stock populations are kept in isolation from each other. To ensure a safe product, all fertilized eggs are disinfected before incubation and all production batches are screened for rhabdovirus before delivery. Our ambition is to obtain a certified disease-free status for perch rhabdovirus.