A comparative study. The purpose was to study the costs and the cost of return. Comparative analysis of the difference between revenue and the cost of return breakeven Between brackish and salt water fish white snapper. This study used data from interviews with of 24 cases. The period 6% of Interest rate of study 5-year. - A study of the brackish cost per acre was 355127.00 baht Salt water 31556.34 baht cost was 850784.15 baht Salt water 788305.00 baht Income yield 1914250.00 baht. and Salt water 1908750.00 baht. the cost according to the net present value (NPV) were positive value equal 620881.68 baht Salt water 628974.65 baht and the internal rate of return (IRR) 16.95% Salt water 17.45 % with a payback period of 1 year 9 months 6 days Salt water 1year 8 months 4 days and the breakeven point is equal to 96529.25 baht Salt water 86643.80 Baht. - The salt water yield worthwhile than brackish water.

This research had objectives for the purpose of studied the rice production technology and cost benefit of farmer members in community rice seed centers (CRSC). The research case study was conducted in Phatthalung province by field surveys combining participatory rural appraisal and structured interview of 35 members during the research period from April 2012-August 2012. The CRSC received contribution grain from government service. The result showed that majority rice community center member were men and in one family had average 2 workers. Their ages between 51-60 years old. The Majority of education were primary school (grade 4). The cultivated area of rice between 11-20 rais. Rice production can generally be divided into the following 10 stages that is soil improvement land preparation crop establishment plantation water management nutrient management pet control weed control harvesting and post harvest. The results of the study found that almost all farmer using private land (69.72 %). The important expense was variable cost 80.25 % Ban-Phab is 3509 bath per rais. Average benefit per rais is 6985.04 bath per rais. The rice break- event point is 317.56 kg per rai. However return on investment explore CRSC Ban-Phab is 99.06 %