เกรียงศักดิ์ เม่งอำพัน : เลขเรียกหนังสือ 2552 / ช 24

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ABSTRACT
The purpose of this study was to evaluate effects of Spirulina supplementary pellet
feed application to 6 years old Mekong Giant Catfish (Pangasianodon gigas) brood stock
on growth and maturation abilities. This study was divided in to 2 treatments. Treatment 1,
catfish were fed formulation pellet only while Treatment 2 catfish were with fresh spirulina
sp. 10% in pellet feed formulation. The results showed average daily gain (ADG), Gain
weight and feed conversion rate (FCR) were not significant different (P>0.05). Catfish in
treatment 1 and 2 provided ADG of 4.78 ± 1.29 and 4.71±0.48 grams/treatment; Gain
weight of 1.72±0.47 and 1.70±0.17 kilograms/treatment and FCR of 0.05 ± 0.02 and 0.04
± 0.00, respectively. Catfish estradiol were not significant different (P>0.05) between
treatment 1 and 2 with a value of 16.70 ± 3.49, 42.32 ± 5.02 in April and 28.19 ± 1.97 and
45.73 ± 12.67 (pg/ml) in July, respectively. In addition, testosterone were not significant
different (P>0.05) between treatment 1 and 2 with a number 0.48 ± 0.14, 0.143 ± 0.07 in
April and 0.02 ± 0.00 and 0.16 ± 0.05 (ng/ml) in July, respectively. However, in July and
August the fish from treatment 2 (SP 10%) provided both eggs and sperm and obtained
fingering amount 2,514 fingerling by artificial breeding.