Growth and Survival of Common Carp (Cyprinus carpio) in Different Cage Shapes

The study on the growth and survival of common carp (Cyprinus carpio) was conducted at the College of Fisheries Laboratory and Research Station, Brgy. Bawing, General Santos City for a period of 60 days from January 18 to March 18, 2019. Nine (9) cages consisting of three (3) square cages (1m x 1m x 1.5m), three (3) rectangular cages (0.8m x 1.25m x 1.5m), and three (3) circular cages (1.13m diameter, 1.5m height) were used as enclosures for the experimental animals and were installed in a pond. Twenty five (25) common carp fingerlings with an initial weight of 2.08g were stocked per cage. A Complete Randomized Design (CRD) was used in the study with three (3) treatments replicated three (3) times and labeled accordingly. The fish were fed commercial diets with approximate crude protein (CP) of 33%. The fish were fed at feeding rates of 3% of their body for 60 days for Treatments I, II and III, respectively. Statistical analysis was done using the IBM SPSS Statistics (Version 20). The significance between treatments means was determined using Duncan Test. The highest mean body weight was obtained by fish in Treatment III with 30.69g, followed by Treatment I with 20.77g and Treatment II with 20.00g. The highest mean weight gain was obtained by fish in Treatment III with 26.78g, followed by Treatment I with 16.712 and the lowest in Treatment II with 15.38g. Fish in Treatment III obtained the highest mean daily weight gain of 0.45g/day, followed by Treatment I with 0.28g/day and the lowest was gained by Treatment II with 0.26g/day. Statistical analysis showed significant difference among treatment means (P<0.05). The growth parameters were subjected to Duncan’s Multiple Range Test (DMRT) and showed that Treatment III was significantly different (P<0.05) to Treatments I and II in terms of mean body weight, mean weight gain and mean daily weight gain. Better feed conversion ratio (FCR) was obtained by Treatment II (1.02) followed by Treatment [ (1.28) and Treatment II (1.29). Statistical analysis showed that there was significant difference among treatment means. Duncan’s Multiple Range Test (DMRT) showed that Treatment III was significantly different (P<0.05) to Treatments I and II. Survival rate was 100% in all treatments. ‘Temperature readings ranged at 29.2- 32.8 °C, pH at 7.5-7.8, dissolved oxygen at 3.8 — 6.7 ppm, and ammonia at 0.0 ppm. These ranges were found to be within the tolerable range for common carp Under the condition of the study, Treatment III had the best result in terms of growth expressed as mean body weight, mean weight gain, mean daily weight gain and FCR.