1928 Catch Compared With An Average of the 3 Preceding Years. In Fish Catch Statistics. California Department of Fish and Game

weight is in pounds (average for year range given by "year" minus "preceding years" for a given species in "species"); "percent fo avg." is catch as percentage of the average重量单位为磅，其取值为物种（species）字段指定的某一物种，在由年份（year）字段减去前序年份（preceding years）字段所确定的年份区间内的平均重量；"percent fo avg."字段表示渔获量占该平均水平的百分比