A Compact, Inexpensive, Automatic System to Deliver Water at Alternating Temperatures for Hatchery Studies

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Abstract
A system was developed to supply ambient and heated water to incubator trays at varied time intervals. Space, budget, and personnel constraints necessitated the development of a compact and inexpensive design that functioned independently for up to 7 d. The system consists of a programmable control panel, solenoid valves that control the flow of water into incubator stacks, and two 189-L electric water heaters plumbed in series. Heated water is delivered on a predetermined schedule to four 16-tray Heath incubators, which have a total capacity of 768,000 fry (12,000 fry/ tray). The cost for this system (excluding the incubator stacks) was about US$2,500. This apparatus was developed to induce banding patterns in the otoliths of juvenile lake trout (Salvelinus namaycush), but a variety of other applications are also feasible.

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