Growth of the rabbitfish Siganus randalli Woodland - University of ...

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aggressive than the milkfish with which they were being cultured. He stated that he thoughtthat the growth of the siganids would be better if they were grown in monoculture.TABLE 13. Statistical summary of samples of rabbitfish (Siganus randalli) stocked in acommercial grow-out operation on Guam. Fish were raised in polyculture with milk fish. Thepond was stocked on September 11, 1990 and harvested on December 5, 1990.VARIABLE OR STATISTIC SAMPLE OF SAMPLE OFSTOCKED HARVESTEDStandard length (em)Number of Fish 60 20Maximum Value 10.0 16.3Minimum Value 3.7 11.3Mean 6.09 14.15Standard Deviation 1.58 1.48Wet WeightWNumber of Fish 60 20Maximum Value 31.7 139.9Minimum Value 1.8 50.5Mean 9.46 100.23Standard Deviation 7.42 28.4DISCUSSIONThe data indicate that S. randalli in pond culture on Guam can reach a marketable sizein less than three months. Rapid growth has also been reported for other species of siganidsfed daily with commercial feeds. Tawada (1991) reported that juvenile S. canaliculatusreared in a concrete tank in Okinawa grew from an average size of 0.3 g to 110 g in 170days. Lichatowich et al. (1984) reported that, in growth trials in cages in the Red Sea, S.rivulatus juveniles grew from 3 g to 105 g in 150 days. Also, Lichatowich and Popper(1975) showed that S. vermiculatus raised in fertilized ponds in Fiji could reach a size of 190g in 130 days, even without supplemental feeding.23
Since, in our study, the juvenile rabbitfish had to compete with milkfish for feedaround the feeders, it is likely that better growth could be achieved if S. randalli wereproduced in monoculture. Also, the commercial feed formulated for catfish was used in thepond growth trial, and results from the tank culture experiments suggest that production couldbe improved by using a feed with a higher protein content. While the pond trial indicatesthat growth of S. randalli is acceptable for commercial cultivation, attention to pondmanagement, stocking densities, and feeds could result in improved performance.24
Page 1 and 2: Growth of the rabbitfish Siganusran
Page 3 and 4: ACKNOWLEDGEMENTSThis work was suppo
Page 5 and 6: Figure 1. Adult of Siganus randal/i
Page 7 and 8: for the larvae. Twelve to fourteen
Page 9 and 10: TABLE 1. Generalized pattern of dev
Page 11 and 12: TABLE 2. Composition of the commerc
Page 13 and 14: groups until three tanks had been a
Page 15 and 16: TABLE 5. Mean initial and final wei
Page 17 and 18: TABLE 8. Mean initial and final sta
Page 19 and 20: TABLE 12. Calculation of apparent f
Page 21 and 22: 3.253.00.........>.0"'0~ 2.75'-'CD+
Page 23 and 24: DISCUSSIONComparison of dietsBetter
Page 25: FIELD GROWTH TRIALSTo allow farmers
Page 29 and 30: The major problems encountered in t
Page 31 and 32: LITERATURE CITEDAndrews, 1.W. and 1
Page 33: Woodland, D.J. 1983. Zoogeography o

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