lab17 - Marine Biology 11, ~t25-i31 (197t) 9 b y...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Marine Biology 11, ~t25--i31 (197t) by Springer-Verlag 1971 Influence of salinity and temperature on the oxygen consumption in young juveniles of the Indian prawn Penaeus indicus M. N. IiUTTu 1, G. MUI~UOAPOOP~Hu 2 and T. S. K~ISHNAN u 1 Department of Biological Sciences, Madurai University; Madurai, S. India and Central Marine Fisheries Research Institute; Mandapam Camp, S. India Abstract Routine oxygen consumption of very young juveniles (0A g) of Penaeus indicus H. MrL~ EDWXaDS was significant- ly influenced by ambient temperature and weight of the animal, but not by ambient salinity, when tested at salinities (7, 2t, 35 %~ to which they had been long-term (over 10 days) acclimated. Standard oxygen consumption of young juvenile prawns (~ to 3 g), subjected to step-wise changes in ambient salinity, from sea water to low salinity waters (2 to 6 %o), measured after short-term (24 h) salinity acclimation at each step, was lowest at salinities where prawns such as those tested occur naturally (10 to t5 Fop). The metabolic rates do not appear to have a direct relation to the osmotic gradient, even when the influence of "interfering" activity is eliminated. It appears that factors other than osmotic gradient will have to be sought in order to explain the metabolic patterns of P. indicus in relation to salinity. Introduction Information gathered on the osmoregulatory be- haviour of crustaceans is well documented (LocK- wooD, i962 ; Kr~, 1963). Investigations with special reference to prawns have been discussed by PANrKK~a (i967). PANIKKAg (i941) observed that some palae- monid prawns are capable of homoiosmotie regula- tion. Subsequently, some penaeid prawns were also shown to have almost as highly organized osmoregula- tory abilities as the palaemonids (P~n~KAR and VIS- WANATHAN, 1948; WILLIAMS, 1960). There are only a few earlier studies correlating osmoregulation and oxygen consumption in prawns (LofTs, 1956; RAP, i958). In the present study, an attempt is made to understand the influence of salinity and temperature on the young juveniles of Penaeus indieus, as judged from their oxygen consumption. Since oxygen con- sumption can be expected to change with the change in demand for energy for various biological activities, one can expect a change in salinity of the surrounding medium to be reflected in the oxygen consumption of an animal. Although there has been some controversy on the subject (see Gnoss, 1957; RAp, 1958; JOB, 1959; P~r~KA~, 1969) there is growing evidence to indicate that the energy spent for osmotic regulation 17 Marine Biology, Vol. 11 can be precisely judged from the oxygen consumption of an animal (RAP, 1968). Perhaps a most useful precaution to be adopted in such studies is elimina- tion of the interference of locomotory activity in the metabolic measurements concerned (FRY, i947; BEA- MIS~ and MOOKH~I~L 1964). No precise method to eliminate the influence of spontaneous activity on metabolism is followed at present, except that of maintaining uniform conditions and avoiding distur- bance of animals during experiments; in one of the present series, however, an indirect method of elimi- nating activity interference has been attempted.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/12/2010 for the course BIOLOGY 225 taught by Professor Pavgi during the Winter '10 term at University of Michigan.

Page1 / 7

lab17 - Marine Biology 11, ~t25-i31 (197t) 9 b y...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online