example, assume the telephone survey estimated 10,000 private/rental boat trips were taken 

 by coastal residents in a State. If non-coastal county residents constituted 10 percent of all 

 intercepted fishermen in that State and mode, then the estimate of total trips was increased 

 by 1,111 (i.e., 0. 10 x 10,000 /0.9) to account for those trips taken by fishermen residing outside 

 the telephone survey area. Similar procedures were used to estimate non-resident trips and to 

 adjust for those fishermen residing in coastal counties who did not have telephones. 



Number of fish caught 



Estimates of total number of fish caught were calculated from the estimated total 

 number of fishing trips by mode obtained from the telephone survey, and the average number 

 of fish caught per trip obtained from the intercept survey. Figure 2 illustrates the manner in 

 which data from the two surveys were combined to estimate number of fish caught. 

 Multiplying the number of trips in a given State, mode, and area during a wave by the average 

 catch of each species in the same State, mode, area, and wave resulted in an estimate of the 

 total number caught of that species. 



All fish that were caught by the intercepted fishermen were not available for the inter- 

 viewer's inspection. The intercept interview, and the estimation procedures, distinguished 

 between (I) those fish brought ashore in whole form which were available for identification, 

 enumeration, and weighing and measuring by the interviewers (Type A catch), and (2) those not 

 brought ashore in whole form. Those not brought ashore in whole form were separated into 

 those those used as bait, filleted, or discarded dead (Type Bl catch) and those released alive 

 (l ype B2 catch). Expanded catch estimates were made for these three types of catch as shown 

 in Figure 3. The purpose of estimating three catch types was to distinguish between those 

 species identified and measured by trained interviewers, and those species reported to the 

 interviewers by fishermen. Previously cited methodological studies indicated species were 

 often misidentified by fishermen and their reported measurements subject to several types of 

 bias. 



The expanded estimate of total catch is the sum of Catch Type A, Catch Type Bl, and 

 Catch Type B2. The expanded estimate of the total catch which was "removed" is the sum of 

 Catch Type A and Catch Type Bl. The expanded estimate of catch not available for 

 identification is the sum of Catch Type Bl and Catch Type B2. 



