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Comparative hematology in marine fish.

D Wilhelm Filho1, G J Eble, G Kassner

  • 1Departamento de Biologia, Universidade Federal de Santa Catarina, Brazil.

Comparative Biochemistry and Physiology. Comparative Physiology
|June 1, 1992
PubMed
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Marine fish hematology reveals active species have higher blood parameters. Cartilaginous fish (rays and sharks) possess larger erythrocytes with more hemoglobin than bony fish (teleosts).

Area of Science:

  • Marine Biology
  • Ichthyology
  • Comparative Physiology

Background:

  • Hematological parameters are crucial indicators of fish health and adaptation.
  • Understanding blood characteristics can elucidate physiological differences between fish groups.
  • The southeastern Brazilian coast hosts diverse marine fish species, including cartilaginous and bony fish.

Purpose of the Study:

  • To compare hematological parameters across different marine fish species from the southeastern Brazilian coast.
  • To investigate the relationship between activity levels and hematological values in marine fish.
  • To identify distinct hematological profiles between cartilaginous and bony fishes.

Main Methods:

  • A comparative study was conducted on 80 marine fish species (14 rays, 14 sharks, 52 teleosts).

Related Experiment Videos

  • Hematological parameters including hematocrit, hemoglobin concentration, and red blood cell counts were analyzed.
  • Erythrocyte size, count, hemoglobin content, and mean cell hemoglobin concentration were compared between fish groups.

    • Main Results:

    • Active fish species exhibited higher hematological values than less active ones.
    • Mean values for hematocrit, hemoglobin, and red blood cell counts increased in the order: rays, sharks, teleosts.
    • Cartilaginous fish (rays and sharks) had larger, fewer erythrocytes with higher hemoglobin content compared to teleosts.

    Conclusions:

    • Significant differences in hematological values, particularly erythrocyte characteristics, were observed between bony and cartilaginous fishes.
    • These contrasts suggest distinct physiological strategies for meeting oxygen demands in different fish taxa.
    • Activity level is positively correlated with key hematological parameters in marine fish.