Summary

Description

The data type contains data from aircraft surveys of herring schools. These data were collected to provide information on herring population density and distribution. Start date and time, start and end positions, and aircraft type, altitude and airspeed were reported for each survey. Surveys were conducted for preassigned areas; mid-point positions of census areas were reported. Environmental information may include meteorological conditions, sea state, air roughness and water clarity. Census data include species identification, school position and activity, school size index and number of schools sighted. Predominant beach type, biota type and escarpment type may also be indicated.