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On the Biology of Calanus finmarchicus. Part IV. Seasonal Changes in the Weight and Chemical Composition in Loch Fyne

Published online by Cambridge University Press:  11 May 2009

A. P. Orr
A. P. Orr
Affiliation:
Chemist Marine Station, Millport.
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Extract

1. The dry weight of 100 male, female and Stage V Calanus in Loch Fyne fluctuated throughout the year. 100 Stage V Calanus in May weighed only about ⅓ of what they did in December. Male and female Calanus also fluctuated considerably in weight.

2. Stage V Calanus is usually largest and heaviest when it is most abundant. With male and female Calanus size and weight are related.

3. Stage V Calanus, in spite of being smaller than female Calanus, was from the beginning of June till the end of August considerably heavier (over 100%). When Stage V Calanus was at its lightest and smallest, it weighed less than female Calanus at the same time.

4. The weight of Stage V Calanus fell during the spring and did not increase again till after the end of the first breeding period.

5. The fat and protein content of Calanus depends chiefly on dry weight. The values obtained for fat content were considerably higher than those hitherto recorded for zooplankton and those of protein lower.

6. The ash content is about 3·6% and the chitin content about 3% of the dry weight.

7. Stage V Calanus accounted for by far the most important part of the total weight of the catch throughout the year.

8. The total food value of the Calanus in Loch Fyne probably varies very considerably from year to year.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 19 , Issue 2 , May 1934 , pp. 613 - 632
Copyright
Copyright © Marine Biological Association of the United Kingdom 1934

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References

REFERENCES

Bogorov, B. G. 1933. Modifications in the biomass of Calanus finmarchicus in accordance with its age. Bull. State Oceanogr. Inst., U.S.S.R., Vol. 8, pp. 1–16. (Russian with English summary.)Google Scholar
Bkandt, K. 1898. Beiträge zur Kenntniss der chemischen Zusammensetzung des Planktons. Wiss. Meeresunters., Vol. 3, Abt. Kiel, pp. 43–90.Google Scholar
Brandt, K., and Raben, E. 1919–1922. Zur Kenntniss der chemischen Zusamrnensetzung des Planktons und einiger Bodenorganismen. Wiss. Meeresunters., N.F., Vol. 19, Abt. Kiel, pp. 175–210.Google Scholar
Klem, A. 1932. Contributions to the study of the oils of marine Crustacea. I. The oils of Meganyctiphanes norvegica M. Sars and Calanus finmarchicus Gunn. Hvalrådets Skrifter, No. 6, Det Norske Videnkaps-Akademi, Oslo, pp. 1–24.Google Scholar
Marshall, S. M. 1933. On the biology of Calanus finmarchicus. II. Seasonal variations in the size of Calanus finmarchicus in the Clyde sea-area. Journ. Mar. Biol. Assoc., N.S., Vol. 19, pp. 111–138CrossRefGoogle Scholar
Meyer, J. A. 1914. Beiträge zur Kenntniss der chemischer Zusammesetzung wirbelloser Tiere. Wiss. Meeresunters., N.F., Vol. 16, Abt. Kiel, pp. 231–283.Google Scholar
Moberg, E. G. 1926. Chemical composition of marine plankton. Third Pan-Pacific Science Congress, Tokyo, pp. 233–236.Google Scholar
Nicholls, A. G. 1933. On the biology of Calanus finmarchicus. I. Reproduction and seasonal distribution in the Clyde Sea-Area during 1932. Journ. Mar. Biol. Assoc., N.S., Vol. 19, pp. 83–109.CrossRefGoogle Scholar
Plimmer, R. H. A. 1920. Practical Organic and Bio-chemistry. London.Google Scholar
Stewart, C. P., Gaddie, R., and Dunlop, D. M. 1931. Fat metabolism in muscular exercise. Biochem. Journ., Vol. 25, pp. 733–748.Google Scholar
Stoddard, J. L., and Drury, P. E. 1929. A titration method for blood fat. J. Biol. Chem., Vol. 84, pp. 741–748.Google Scholar
Wimpenny, R. S. 1929. Preliminary observations on the fat content of the plankton on the English herring grounds in the North Sea. Ministry of Agriculture and Fisheries, Fishery Investigations, Ser. II, Vol. II, No. 5, pp. 1–23.Google Scholar