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Further Observations on the use of Hybrid Sunfish in Stocking Small Ponds
Author(s) -
Krumholz Louis A.
Publication year - 1950
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1949)79[112:footuo]2.0.co;2
Subject(s) - lepomis , stocking , hybrid , biology , fishery , fish measurement , fish <actinopterygii> , lepomis macrochirus , centrarchidae , ecology , zoology , agronomy , micropterus
A total of 16,075 hybrid sunfish (Lepomis microlophus, female x L. macrochirus, male) were placed in 78 small ponds in southwestern Indiana in November, 1947. During the summer of 1949 each pond was seined. All together 722 hybrid sunfish were taken from 62 ponds. Of that total, 317 individuals were caught from 29 ponds in which no other fish were present and the remaining 405 were taken from 33 ponds that contained other kinds of fish. The remaining 16 ponds yielded no hybrids during seining operations. In general, the hybrid sunfish from those 29 ponds in which they had no competition from other species grew faster and were relatively heavier for their length, especially in the larger size groups, than those taken from the other ponds. The hybrids were relatively larger and heavier for their length than individuals of the same age groups in either of the parent species taken from similar ponds. Data on the fork lengths and total lengths of hybrid sunfish and on respective average weights are given. The presence of other fish in the ponds with the hybrids was due largely to intentional introduction rather than to natural invasion.