A comparison of loading densities for sockeye salmon in a gravel incubator / by Judy E. McDonald.: Fs143-2/77-2E-PDF

"An upwelling gravel incubator was operated at Fulton River, B. C., to establish optimum egg densities for sockeye salmon production. Load levels were 5,000 to 11,000 eggs per layer, eggs were planted while soft, in gravel 2.5 to 3.2 cm in diameter with an approximate total inflow of 795 1/min. for 1.5 million eggs. Comparisons were made of egg-to-fry survival, emergence timing and fry quality between egg densities. Satisfactory survivals to the fry stage were obtained at all load levels, although fry emerging from egg densities of 11,000 eggs per layer were shorter. Furthermore, fry migrations were contracted in those sections planted at 9,000 and 11,000 eggs per layer. It was concluded that practical egg densities for sockeye production are considered below 11,000 eggs per layer under the above conditions"--Abstract.

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