Water temperature and fish size are two important factors having
great influence on endogenous nitrogen excretion, and ingestion of
food will lead to an increase in exdogenous nitrogen excretion
(Jobling, 1994). In the paper NE of cobia was affected significantly by
water temperature and fish size. However, the variations of NE among
different temperature groups were not as much as those among different
size groups for cobia. Actually, in some studies (Kaushik, 1981;
Kikuchi et al., 1995), compared with factors such as food intake and
fish size, direct effects of water temperature on NE were minor. Savitz
(1969) reported that, NE of bluegill sunfish Lepomis macrochirus appeared
to change little between 7 and 15.6 °C. Similar findings of smaller
influence of water temperature on NE in comparison with fish size
were observed for cobia in the tested temperature and size ranges.
Likewise, linear relationship between NE and FC of cobia was also seen
in Fig. 2 after conversion to the energy values and seemed independent
of water temperature and fish size, which indicated that changes of NE
resulted mainly fromFC though direct effects of water temperature and
fish size used in the experiment existed.
Water temperature and fish size are two important factors havinggreat influence on endogenous nitrogen excretion, and ingestion offood will lead to an increase in exdogenous nitrogen excretion(Jobling, 1994). In the paper NE of cobia was affected significantly bywater temperature and fish size. However, the variations of NE amongdifferent temperature groups were not as much as those among differentsize groups for cobia. Actually, in some studies (Kaushik, 1981;Kikuchi et al., 1995), compared with factors such as food intake andfish size, direct effects of water temperature on NE were minor. Savitz(1969) reported that, NE of bluegill sunfish Lepomis macrochirus appearedto change little between 7 and 15.6 °C. Similar findings of smallerinfluence of water temperature on NE in comparison with fish sizewere observed for cobia in the tested temperature and size ranges.Likewise, linear relationship between NE and FC of cobia was also seenin Fig. 2 after conversion to the energy values and seemed independentof water temperature and fish size, which indicated that changes of NEresulted mainly fromFC though direct effects of water temperature andfish size used in the experiment existed.
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