Coastal Shrimp Aquaculture in Thailand: Key Issues for Research

!ning (Q8_1), site selection to avoid impacts on other users (Q8_2), design of separatewater supply/drainage system (Q8_4), other measures taken to reduce the impacts ofthe farm (Q8_7), number of aquaculture farms within 3 km of the farm (Q7_8),number of aquaculture farms sharing water supply (Q7_9) and number of farms dischargingeffluent into water supply canal (Q7_10); the existence of water or sedimentrelated problem (Q14PROB); and feed quality problem over the past 3 years(Q16_4B). It was possible to identify the farms in Nakhon Sri Thamarat Provincefrom the total farms in the survey with an accuracy of 93.44% using only those ninevariables (see Appendix).Phetchaburi ProvincePetchaburi Province was different from most other provinces and, although thefour variables which follow are included in the model, none of the farms from thatprovince could be identified. Surprisingly, the farms not in Petchaburi Provincecould be identified perfectly using the four variables: source of salt water (WSALT);environmental impact assessment during planning (Q8_1); design of separate watersupply/drainage system (Q8_4); and effluent treatment pond (Q8_6) (see Appendix).Samut Sakhon ProvinceFor Samat Sakhon, which had only one farm in the analysis, it was not possible tofind a set of variables which could identify only that farm. However, by using justtwo variables—soil type (SOIL) and environmental impact assessment during planning(Q8_1)—it was possible to identify 99.61% of farms as being in the other provinces.This solution was not unique because other variables could be statisticallydetermined which could also identify a high proportion of the farms as being in otherprovinces (see Appendix).Satun ProvinceThe farms in Satun Province could be identified from the total farms in the surveywith an accuracy of 94.59% by using the following nine key variables: source of saltwater (WSALT); three variables relating to measures taken to reduce impacts, i.e.site selection to avoid impacts on other users (Q8_2), number of aquaculture farmswithin 3 km of the farm (Q7_8) and number of farms discharging effluent into watersupply canal (Q7_10); salinity problem over the past 3 years (Q14_1B); temperatureproblem over the past 3 years (Q14_2B); bacteria problem over the past 3 years(Q15_1D); feed quantity problem over the past 3 years (Q16_3B); and other problemswhich have resulted in diminished harvest, loss of crop or missed crop(Q16OTH) (see Appendix).Songkhla ProvinceThe key variables for this province were: number of years of farming at the site(Q1_1); major problem (Q2_3); four variables relating to measures taken to reducethe impact on the farm, i.e. site selection to avoid impacts of other users (Q8_3),design of separate water supply/drainage system (Q8_4), number of farms sharingwater supply (Q7_9) and number of farms discharging effluent into the same watersupply canal (Q7_10); seed quality problem over the past 3 years (Q16_2B); and feed&"