UMT MOOC: Ornamental Fish Culture - Topic 7: Seed Production - Factors Influencing Larval Rearing

Seed production, not referring to plant, is the production and hatchery management of offspring (larvae, fry, or fingerling) of the fish. Constant supply of seed production (from the wild or hatchery production) ensures optimal production output. Seed production goes through these four stages: (1) broodstock husbandry, (2) spawning, (3) larvae rearing and weaning, and (4) nursery and grow-out. Item (1) and (2) have been discussed in previous topics, hence, our focus will be on third phase in larvae rearing, feeding, and weaning.

After spawning, depending on the type of fish species, hatchling should be either separated or kept together with the broodstocks. This is the first crucial factor that influences the size of the grow-up tank. Next, is the stocking density or how many juveniles within the tank? pH which will affect the growth needs to be considered. The type of food and feeding practices will also impact the area needed for growing. Tank size will determines the water changing volume and frequency. Larger tank size needs less frequent water changes, more so with gentle filtration. Lastly, what kind of rearing media will be used like aquatic plants or substrates.

Discussion about tank size have reminded me about how to calculate the tank water volume as shown in the video below.

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