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Rainbow Trout Life Cycle

1. Fertilised eggs- have black eyes and hatching depends on the water temperature, no feed is given at this stage as they live off their own nutrients within the sac. (Hatchery) 2. Sac fry- once hatched, the trout have a large yolk sac used as a food source. Live close to the ground until they “button up”- absorbs its own sac fully before they can start feeding. (Hatchery)
3. Fry- swim close to the water’s surface, allowing the swim bladder to fill with air and help the fry float. Development of markings on the skin starts and usually 1-3mm pellet form is used at this stage. (Hatchery) 4. Fingerling- when a fry grows to between 50-127 mm, it becomes a fingerling. The development of markings on the skin is very important in this stage. Fingerlings weigh an average of 7 g, are fed 6-8 times per day with the 1-3 mm size pellet. (Nursery)
5. Grow outs- they roughly eat about 1 kg of pellets per day and the 4 mm+ size is used, they weigh about 60 g in the initial stage and are grown to between 380 g-420 g. This process usually takes between 3-4 months. They are quite aggressive at this stage and often attack each other. (Natural habitat dam) 6. Adult/Plate size- trout will turn vibrant in colour during spawning and lay eggs in fish nests, redds or in gravel, 4mm+ pellet form is used (Natural habitat dam)
7. Fully grown- grow outs are sent to the Katse Dam (Lesotho) to continue the growth process instead of being harvested for plate size. They grow to about 1.2-1.5 kg in size, 4mm+ pellet form is used (Natural habitat dam)  

 

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