Weight of fish caught 



Lengths and weights were obtained by sampling the fish caught and brought ashore in 

 whole form by intercepted fishermen. Therefore, estimated weights were calculated only for 

 catch Type A fish. Since the size composition of the remainder of the total catch (Catch Type 

 Bl and Catch Type B2) is unknown and may differ from that of the fish represented in Catch 

 Type A, estimates of the weight of the remainder of the catch were not calculated. 



Incomplete trips 



Most of the trips sampled in the intercept survey were compieted trips. That is, the 

 fisherman was interviewed only at the end of the fishing trip. When fishermen were 

 interviewed as they left the fishing site, their probability of inclusion in the survey was not 

 related to the length of their trip. A person who took a long trip and one who took a short trip 

 had equal chances of being interviewed if the interviewer remained on-site all day. 



If fishermen were interviewed while they were fishing, the probability of selection was 

 related to the length of the fishing trip. This occurred only if interviewers arrived at a shore 

 site at which there was very little fishing activity. They then interviewed those fishermen 

 present and proceeded to another site to conduct interviews. When an incomplete trip was 

 processed, it was converted into a simulated complete trip so that the probabilities of 

 inclusion were equivalent for all types of trips, and the catch was related to the duration of 

 the average trip. 



Participation estimates 



The estimate of the number of participants, derived from telephone and intercept data, 

 was complicated by the fact that people exhibited varying levels of fishing avidity. Some 

 fished very frequently and others very infrequently. The probability of selection in the 

 intercept survey was higher for the person who fished frequently than for a person who seldom 

 fished. In estimating the total number of distinct participants it was necessary to correct for 

 these differences in probability of selection based on differing levels of avidity. Estimates 

 were only made on a State basis. The participation estimates produced are not additive across 

 States since an individual con fish in more than one State during the survey period. 



