04269nas|a2200421 a 4500 20260818095107.0 071022s2006 th uu|m rtt 0| a1eng d .b11825686 AIT Thesis no.AQ-06-28 Tippawan Tantawanich Effect of stocking density and shelter surface area on growth and survival of the tropical abalone (Haliotis asinina) in a semi-flow through system Pathum Thani, Thailand : Asian Institute of Technology, 2006 87 leaves : ill. Thesis ; no. AQ-06-28 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 2006 The tropical abalone Haliotis asinina, also called donkey-ear abalone, is a highly valued marine mollusk with very high export potential but its culture techniques still need to be developed. An experiment was conducted to investigate the effects of stocking density and shelter surface area on the growth and survival of abalone reared in fiberglass tank (0.50 m2 in bottom area) with a semi-flow through system (water volume = 0.2 m3). Abalone with average initial body weight of 1.42 g and shell length 18.7 mm were stocked at stocking densities of 100, 200 and 300 abalone m 2. One, two or three pieces of Vshaped PVC shelters were added to the tanks during the culture period. Abalone were provided with artificial diet (25% crude protein) at a feeding rate of 2.0-2.5% of body weight daily for 201 days (6.7 months). In the first 5 months of culture, there was no significant difference (P>0.05) in specific growth rates (SGR) in body weight, shell length, shell width among treatments. At the end of culture period (March), there was no significant difference in specific growth rates among three shelter surface areas (0.09, 0.18 and 0.27 m2) at stocking densities of 100 and 200 pcs. m-2, but at 300 pcs. m 2 with three shelters (0.27 m2) abalone had significantly higher (P<0.05) specific growth rates for body weight and shell length. Also at 300 pcs. M-2 with two shelters (0.18 m-), abalone had significantly higher specific growth rate for shell length at the end of culture period. There was no significant difference in specific growth rate for shell width at different stocking densities and shelter surface areas throughout the culture period. These results indicate that at higher stocking density of 300 pcs. m 2, at least 3 shelters (0.27 m2) are needed on the sixth month, since growth decreases with increasing density but increases with increasing shelter surface area. In this experiment, abalone survival was not affected by stocking density and shelter surface area. This may be explained that even if abalone cannot feed enough as a result of stacking due to lack of shelter surface area, they can still survive but not grow well Abalone culture Thailand Gallardo, Wenresti G., Chairperson Ikejima, Kou, Examination Commitee Bart, Amrit N., Examination Committee Jarayabhand, Padermsak, Examination Committee Royal Thai Government Fellowship Thai Research Fund, Scholarship Donor Asian Institute of Technology. Thesis ; no. AQ-06-28 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B09801 .b11825686 mnait u 240402 0 071022 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120698039 CREATED : 1999-12-16 RECORD # : i12242846 LPATRON : 1018481 LCHKIN : 2006-08-12 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 5 TOT RENEW : 2 Barcode : 30050120698021 CREATED : 2006-05-25 RECORD # : i12544309 LPATRON : 1022109 LCHKIN : 2009-01-30 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050120358766 CREATED : 2016-08-06 RECORD # : i13025818 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 34691 34691 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.AQ-06-28 30050120698039 2026-08-18 09:51:07 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.AQ-06-28 30050120698021 2026-08-18 09:51:07 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.AQ-06-28 30050120358766 2026-08-18 09:51:07 1 2026-08-18 40