Population Dynamics of the Green Sunfish Redear Sunfish Hybrid as Compared with Its Reciprocal Cross and Parental Species

Astudy was made on the growth and survival rates, sex ratios, and vulnerability to angling ofthe green sunfish redear sunfish ( (G X R) hybrid as compared with its reciprocal cross and parental species. The G x R hybrid had the highest mean annual absolute growth rate while the redear sunfish 0 X green sunfish C; (R x G) hybrid had the highest mean annual relative growth rate. The G x R hyhrid generally had the highest mean annual survival rate, while the green sunfish had the lowest. The sex ratios were: G x R hybrids. 99% males; R x G hybrids. 88% males; green sunfish. 83% males; andredearsunfish. 45% males. TheG x Rbybrid. R x G hybrid. and green sunfish were more vulnerable to angling than the redear sunfish. Abundant F2 offspring were observed in the pond containing pairs of R X C hybrids, while no F2 offspring were observed in the pond containing pairs of G X R hybrids.

Starting page
273
Ending page
278
ID
43687