with polyadenylic acid. The addition of increasing amounts of polyadenylic acid to an acridine orange solution in 0.5M KCL, 0.01M NaOAc, pH 6.7, results in a very marked decrease in extinction at = 495 m[i, which also decreases relative to the 465 mrt peak, as Figs. 1 and 2 show. Under the above conditions, the with polyadenylic acid. The addition of increasing amounts of polyadenylic acid to an acridine orange solution in 0.5M KCL, 0.01M NaOAc, pH 6.7, results in a very marked decrease in extinction at = 495 m[i, which also decreases relative to the 465 mrt peak, as Figs. 1 and 2 show. Under the above conditions, the 1.0 2.0
MOLE RATIO
The sex, length, and weight were determined of nearly all recently transformed sea lampreys migrating downstream in the Carp Lake River, Michigan, in the fall, winter, and spring of 1960–61. Similar data were collected from samples of an earlier run in the Carp Lake River and of runs in three other tributaries of Lakes Huron and Michigan. The sex ratio of the 1960–61 migrants in the Carp Lake River was 324 males:100 females. Sex ratios of migrants in the other runs varied from 77 to 86 males:100 females. The high proportion of males in the 1960–61 run in the Carp Lake River is attributed to the effective prevention of recruitment of sea lampreys in the river and transformation of the females at an earlier age than is characteristic of the males. A near equal sex ratio among recently transformed migrants is considered normal for the species. The sex composition of a run changed during the period of migration. The proportion of males among the migrants was greatest at the beginning of the run and declined steadily thereafter. The average size was smaller for males than for females. Differences in the mean lengths and weights of the sexes were statistically significant. The length–weight relation differed for the sexes and showed a slower rate of increase of weight with increase in length than is characteristic of other stages of the animals' life cycle. Seasonal changes in the length–weight relation had a trend toward lower weights among the migrants coming downstream in the later months of the run.
The fish population of Deep Lake (Oakland County, Michigan) was killed by poisoning with rotenone. It is believed that almost all of the fish 1 year old and over were recovered. An unknown number of the young‐of‐the‐year may not have been found, although a special effort was made to recover as many of these small fish as possible. A total of 27,329 fish weighing 562.7 pounds, was recovered, or 38.0 pounds per acre. Bluegills were the most abundant species. Legal game fish made up 3.2 percent of the number and 56.1 percent of the weight of all fish recovered. Data are presented on the length, weight, and numbers of fish by age groups and year classes for the individual species. Comparison is made between the total fish population (in pounds per acre of lake surface) of Deep Lake and other natural lakes in Michigan, Wisconsin, Florida, and Nova Scotia.
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