. Bulletin. Natural history; Natural history. August, 1960 Hansen et al.: Hook-and-Line Catch 371 a: g o Q- - LARGEMOUTH BASS. -4-F 1947 1948 1949 1950 1951 Fig. 9.—Weight of largemouth bass kept per man-hour of angling in fertilized (F) unfertilized ponds; data from table 20. 1952 and ones to receive treatment could occur once in 20 times. Although the ponds were chosen for fertilization on an arbitrary rather than on a purely random basis, we had no advance knowledge of how the six ponds might rank as fish-producing waters. The wide variation in catch rates fo
. Bulletin. Natural history; Natural history. August, 1960 Hansen et al.: Hook-and-Line Catch 371 a: g o Q- - LARGEMOUTH BASS. -4-F 1947 1948 1949 1950 1951 Fig. 9.—Weight of largemouth bass kept per man-hour of angling in fertilized (F) unfertilized ponds; data from table 20. 1952 and ones to receive treatment could occur once in 20 times. Although the ponds were chosen for fertilization on an arbitrary rather than on a purely random basis, we had no advance knowledge of how the six ponds might rank as fish-producing waters. The wide variation in catch rates for the three fertilized ponds at Dixon Springs points to the need for studies of catch rates on ponds before, as well as after, fertilization. A study of this kind is now in progress. Wells, Boaz, and Elam, the three control ponds of the study reported here, were restocked in 1954 and fertilized for two seasons. Bluegill catch rates in each of these ponds were better after fer- tilization than before. The fact that bass fishing in both Hooker and Phelps for the period 1947- 1952 was inferior to bass fishing in each of the control ponds, table 20, suggests several possible conclusions: (1) fertili- zation was of no help to bass fishing, (2) the benefits of fertilization varied greatly from pond to pond, or (3) no positive correlation existed between the fish population of a pond and the catch rate. The rotenone census of the fish populations showed that poor bass fishing in Hooker and Phelps may not have been due to scarcity of usable-sized fish in these ponds so much as to the difficulty of catch- ing them. That fishing for both bass and bluegills was generally much better in Lauderdale than in the other fertilized ponds is not easily explained, unless possibly by the lighter fishing pressure, as discussed in the section "Fishing Pressures and Catch ; At the time of the 1953 rotenone census, the number per acre of usable- sized bass was smaller in Lauderdale th
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