Variation in yolk absorption and early growth of brook charr Salvelinus fontinalis (Mitchill), Arctic charr, Salvelinus alpinus (L.) and their hybrids

S. fontinalis (FF), S. alpinus (AA) and hybrids between these species (FA, AF: first letter indicates the species of the female) were studied. Progeny from female brook charr had more yolk than those from female Arctic charr. Growth rates during yolk absorption were similar in FF, AF, and AA, and were faster than those observed in FA. Yolk absorption rates were determined by the paternal species: progeny from brook charr males used their yolk more rapidly than those from Arctic charr. As development progressed, hybrid weights during rearing were intermediate to those of the parental species. -from Authors