Sample sizes in Texas headboat surveys

Bay and Gulf headboats were surveyed in three areas of the Texas coast from 1 September 1978 through 31 August 1982. Sample size (No. of headboat trip surveys) analyses of bay headboats indicate conducting 21 headboat trip surveys each season (15 May-20 November; 21 November-14 May) in both the Aransas Bay/Corpus Christi Bay and lower Laguna Madre areas and 34 surveys (15 May-20 November) and 48 surveys (21 November-14 May) in the Galveston Bay area would enable detection of a 75% difference between two mean catches 80% of the time at the 10% significance level. Conducting 42 Gulf headboat surveys each year in each of the three Texas coast areas would enable detection of a 50% difference between tow mean catches 95% of the time at the 10% significance level.