Survival of brown trout eggs: two planting techniques compared. Harshbarger, undefined & P. E. Porter, T. J. 1979.
Survival of brown trout eggs: two planting techniques compared. [pdf]Paper  abstract   bibtex   
This paper compares survival of eggs, embryos, and swim-up fry of brown trout (Salmo trutta) in direct intragravel plants and in Vibert boxes. Egg mortality increased disproportionately in Vibert boxes after 4 weeks until time of hatching. Direct intragravel plants yielded the highest survival to the swim-up stage.

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