Graduate Thesis Or Dissertation
 

Growth of channel catfish, Ictalurus punctatus (Rafinesque), fed artificial diets in ponds near Corvallis, Oregon

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  • The experiment was conducted at the Soap Creek farm ponds near Corvallis, Oregon. Oregon Moist Pellet and Purina Trout Chow at three different rates of feeding for each diet were used to feed fingerling channel catfish stocked at the rate of 1,000 per acre. A complete random design and Fisher's least significant differences tests of the means were employed to compare the growths of fish from six treatments which were sampled at three separate times. The growth rates of fish from all treatments were quite similar and the differences of the mean length and weight of fish from each period of rearing were not consistent, which suggests that their growth rate was not dependent upon the diets or the feeding rate but rather upon some factor such as temperature. The standard deviations of the mean weights of fish were extremely high, which indicates that not all fish relied on the supplemental foods. Positive values of the amount of skewness in the weight frequency distributions indicates that the majority of fish were small. The mean conversion factors for both diets at any feeding level were quite similar, which suggests that the fish did not respond well to an increase in the amount of food available. And since the fish in this experiment did not rely completely on the artificial diets, the conversion factors are of little value from a nutritional standpoint. The production of fish in this experiment was in the neighborhood of 66 kg. per surface acre over a period of 151 days. This figures indicates that rearing channel catfish with supplementary feeding in the Willamette Valley might hold promise.
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