Malays. Appl. Biol. (1998) 27(1 & 2): 105-112
PRELIMINARY STUDY ON TANK CULTURE OF AFRICAN CATFISH, CLARIAS GARIEPINUS, IN OUTDOOR FIBERGLASS TANKS
AHYAUDIN B. ALI* and CHEAH HUEY CHENG
School of Biological Sciences, Universiti Sains Malaysia, 11800 Minden Penang, Malaysia
ABSTRACT
The African catfish, Clarias gariepinus (Burchell), at the initial mean size of 1.89 ± 0.04 gm was grown at four different densities of 92, 185, 276 and 462 ind./m2 respectively i.e. 300, 600, 900 and 1500 ind./tank for 14 weeks in rectangulai fiberglass tanks. The growth rate was high at the lowest stocking density whereas at higher densities mortality increasec to between 65 and 95%. Higher stocking densities resulted in higher yields but smaller individual size at harvest as well as greater variation in size distribution. Size hierarchies were established among fish in all stocking densities but a shift towards higher individual size at harvest was observed for the lower densities. The stocking densities of 185 to 276 ind./m2 are deemed suitable for intensive culture of catfish in fiberglass tanks.
ABSTRAK
Ikan keli Afrika, Clarias gariepinus (Burchell), yang inempunyai saiz permulaan 1.89 ± 0.04 gm telah diternak pada empat saiz kepadatan penstokan iaitu 92, 185, 276 dan 462 individu/m2 masing-masing (i.e. 300, 600, 900 dan 1,500 individu/ tangki) selama 14 minggu dalam tangki fiberglas empat segi bujur. Kadar pertumbuhan individu adalah tertinggi pada kepadatan penstokan yang terendah manakala pada kepadatan penstokan yang tinggi, kematian meningkat pada 65 hingga 95%. Kepadatan penstokan yang tinggi menghasilkan tuaian yang tinggi tetapi saiz individu tuaian adalah kecil dengan variasi saiz taburan yang luas. Hierarki saiz terdapat di antara ikan pada semua kepadatan penstokan tetapi terdapat saiz individu yang lebih besar pada kepadatan penstokan yang terendah semasa tuaian. Kepadatan penstokan pada 185 hingga 276 individu/m2 dianggapkan sesuai untuk ternakan intensif ikan keli dalam tangki fiberglas
Key words: Catfish, intensive culture, tanks culture, stocking density
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