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Electrolytes and nitrogen compounds of body fluids and tissues ofOctopus vulgaris Lam.

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Summary

  1. 1.

    The water content ofOctopus vulgaris blood was found to be about 870 g/kg of wet tissue, while that of solid tissue was between 720–800 g/kg of wet tissue, except for the hepatopancreas that was 680 g/kg.

  2. 2.

    Blood plasma was hyperosmotic to the seawater environment. Urine was isosmotic.

  3. 3.

    The total cation (or anion) charge of blood plasma was 624 mEq/l, of urine 670, and of the seawater environment 646 mEq/l.

  4. 4.

    The ionic concentration of the body fluids was higher than that found in other cephalopods; although in all cephalopods it is within 2% (98%–102%) of the ionic concentration of seawater.

  5. 5.

    Proteins represent the major buffer system inO. vulgaris blood plasma.

  6. 6.

    The concentration of protein and copper in the blood plasma was 10,540 and 25.5 mg% ml respectively, practically all of the copper being bound to proteins and only 0.013 mg/ml being in free form.

  7. 7.

    The ionic concentration in the solid tissues differed slightly according to the tissue examined. High levels of sodium chloride were found in the branchial heart and in the branchial gland. Potassium was higher in the brain and white body, while iron and copper levels were highest in the hepatopancreas.

  8. 8.

    Ammonia and amino acids were the major free compounds inO. vulgaris urine and solid tissue, respectively. The ammonia and urea levels were higher in solid tissues than in blood, and in some tissues (brain and hepatopancreas) they were more than 20 times as high. Uric acid occurred in kidney and hepatopancreas in concentrations above 50 mg/100 g of tissue water, but it was absent from other tissues (except brain).

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Authors and Affiliations

  1. Department of Biochemistry, Zoological Station, I-80121, Napoli, Italy

    Antimo D'Aniello, Luigi Strazzullo, Guiseppe D'Onofrio & Mischele Pischetola

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  1. Antimo D'Aniello
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  2. Luigi Strazzullo
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  3. Guiseppe D'Onofrio
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  4. Mischele Pischetola
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D'Aniello, A., Strazzullo, L., D'Onofrio, G. et al. Electrolytes and nitrogen compounds of body fluids and tissues ofOctopus vulgaris Lam.. J Comp Physiol B 156, 503–509 (1986). https://doi.org/10.1007/BF00691036

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  • DOI: https://doi.org/10.1007/BF00691036

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