. The Australian zoologist. Zoology; Zoology; Zoology. FOOD AND FEEDING OF ROCK BLACKFISH The percentages of plant material in the diets of the three different size classes, viz. adults, juveniles and small juveniles, were compared. The percentage data were first transformed using an arcsin transformation and 95% confidence limits were calculated for the three size classes. The morphology of the alimentary tract was examined in 89 adult specimens. The structure of the teeth, tongue, gill rakers, oesophagus, stomach, pyloric caeca and the main components of the intestine were noted. The relativ
. The Australian zoologist. Zoology; Zoology; Zoology. FOOD AND FEEDING OF ROCK BLACKFISH The percentages of plant material in the diets of the three different size classes, viz. adults, juveniles and small juveniles, were compared. The percentage data were first transformed using an arcsin transformation and 95% confidence limits were calculated for the three size classes. The morphology of the alimentary tract was examined in 89 adult specimens. The structure of the teeth, tongue, gill rakers, oesophagus, stomach, pyloric caeca and the main components of the intestine were noted. The relative gut lengths (RGL= total gut length/standard length in mm) of adult, juvenile and small juvenile fish were calculated following the method of Al-Hussaini (1949). RESULTS Three distinct size classes, adults, juveniles and small juveniles, were distinguished during this study. The length frequency distribution of adults (240- 490 mm SL) collected from spearfishing competitions is shown in Fig. 1, and Fig. 2 shows the length frequency distribution of juvenile (73-134 mm SL) and small juvenile (13-55 mm SL) fishes collected from tidal rock pools. Members of a fourth size class (sub-adults), which would fall within the size range between 135 and 239 mm SL, were observed to occur in schools of up to 50 individuals beneath large boulders and ledges in the shallow sublittoral zone (pers. obs. authors). Fish of this size, however, were not sampled during the present study as they were too small to be taken by spearfishermen and proved too difficult to sample in sufficient numbers by other D n = FIG. 2W 260 2B0 300 320 340 360 380 WO ^20 UUO 4 60 U80 500 STANDARD LENGTH (MM) 1. Length frequency distribution in 10 mm groupings (0-9, 10-19 mm etc.) for adult G. elevata collected by spearfishing from sub-littoral reef habitats between and Aust. Zool. 20(3), 1980 393. Please note that these images are extracted from scanned page images that may have
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1914
