48 



from sports fishermen is that OSY may refer to a particular species. How- 

 ever, experience suggests that many fishermen who fish for a variety of 

 species cannot give items (l)-(4) for particular species (if, in fact, they 

 can recall items (l)-(4) at all). Thus the nature of marine recreational 

 fishing suggests that, while the general types of necessary data are known, 

 gathering those data is difficult and expensive. 



Basically there are two types of surveys which can be used to gather 

 marine recreational fishing data: (1) the population-specific survey and 

 (2) the site-specific survey. The population-specific survey requires that 

 the general population be systematically sampled by phone, by mail, by door- 

 to-door interviewers, or by some other systematic sampling methods. Within 

 the population-specific survey, one can gather basic data on total partici- 

 pation (item (1) above) and perhaps crude data on catch and outings (items 

 (2) and (3) above). The purpose of the site-specific survey is to develop 

 a sample which is representative of marine recreational fishermen, or the 

 individuals fishing for a particular speices. It involves contacting indi- 

 viduals in the field. From the site-specific survey, with data on catch per 

 outing, average cost per outing, and total number of outings, by site and 

 by species, can be gathered. Such data are necessary for the estimation of 

 the per capita demand functions used in determining OSY. Of the two types 

 of surveys, we can conclude that the population-specific survey is better at 

 gathering participation data, while the site-specific survey is a superior 

 source of data concerning catch, number of outings by species and by site, 

 and cost data. Both methods need to be modified by techniques such as the 

 wave approach used by SMND which reduce the period of time over which indi- 

 viduals must recall data. 



