. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLIC RATE IN ELOPOMORPH FISHES 281. 20 30 40 50 60 Standard Length (mm) 70 Figure 1. Change in wet-weight-sped fie ETS activity (^g-at O h ' [g wet wt]"') during metamorphosis of bonefish (Albula sp.) leptocephali (y = - ; r = ; A' = 19). Assay temperature = 23°C. Metamorphosis proceeds from right to left along the _v axis because larvae decrease in length dunng this period (Pfeiler, 1984). The arrowhead shows the standard length at the end of metamorphosis. Open symbols are values obtained from fr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. METABOLIC RATE IN ELOPOMORPH FISHES 281. 20 30 40 50 60 Standard Length (mm) 70 Figure 1. Change in wet-weight-sped fie ETS activity (^g-at O h ' [g wet wt]"') during metamorphosis of bonefish (Albula sp.) leptocephali (y = - ; r = ; A' = 19). Assay temperature = 23°C. Metamorphosis proceeds from right to left along the _v axis because larvae decrease in length dunng this period (Pfeiler, 1984). The arrowhead shows the standard length at the end of metamorphosis. Open symbols are values obtained from fresh larvae; solid symbols are values obtained from frozen larvae (see Materials and Methods). of activity would, however, be expected in damaged larvae, whether they were assayed immediately or frozen. Pelagic premetamorphic leptocephali are often dead or dying by the time the net is retrieved, and this might explain some of the variation in activity values reported here and by Schalk(1988). The apparent activation energies (£a) for ETS activity of leptocephali and the lack of an effect of environmental temperature on E3 in M. punctatits agree well with results reported for marine plankton (Packard ct a/.. 1975). Wet-weight-specific ETS values for leptocephali re- ported here and by Schalk (1988) (4-20 ^g-at O h ' g ' at in situ temperature) are very low compared to those reported for walleye pollock larvae by Yamashita and Bailey (1990). These authors found an ETS value of jil O: h ' (mg dry wt) ' in prefeeding larvae assayed at °C. Mean ETS activity of the four fresh early meta- morphic leptocephali of Albula sp. (Table I) was about 4 times lower ( /il O: h ' (mg dry wt) ') for larvae adapted to, and assayed at, a much higher temperature (23°C). If we ignore the possibility of compensation to low temperature adaptation and assume that Ea sp. is not affected by adaptation temperature, the value obtained at 23°C can be converted to °C using the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
