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Morphological abnormalities in elasmobranchs.

A B M Moore1

  • 1RSK Environment Ltd, Spring Lodge, 172 Chester Road, Helsby, Cheshire WA6 0AR, U.K.

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|April 24, 2015
PubMed
Summary
This summary is machine-generated.

Ten abnormal sharks and rays were found in the Persian-Arabian Gulf, exhibiting deformities. One milk shark lacked pelvic fins, a rare elasmobranch anomaly possibly linked to pollution.

Keywords:
deformitydesalinationpollutionsalinitysharktemperature

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Area of Science:

  • Marine Biology
  • Ichthyology
  • Environmental Science

Background:

  • Elasmobranchs, including sharks and rays, are vital components of marine ecosystems.
  • The Persian-Arabian Gulf faces significant environmental pressures, including extreme conditions and pollution.
  • Deformities in aquatic species can indicate underlying environmental stressors.

Purpose of the Study:

  • To report and document observed abnormalities in free-swimming elasmobranchs from the Persian-Arabian Gulf.
  • To investigate potential causes, such as environmental factors and pollution, for these observed deformities.
  • To record rare occurrences, like the complete absence of pelvic fins in a milk shark.

Main Methods:

  • Field observation and documentation of abnormal elasmobranch specimens.
  • Species identification and cataloging of deformities (e.g., head, snout, fins, claspers).
  • Literature review to contextualize findings and discuss potential etiological factors.

Main Results:

  • A total of 10 abnormal elasmobranchs across five species were recorded.
  • Observed deformities included malformations of heads, snouts, caudal fins, and claspers.
  • A milk shark (Rhizoprionodon acutus) exhibited complete absence of pelvic fins, a potentially novel finding in elasmobranchs.

Conclusions:

  • The Persian-Arabian Gulf harbors elasmobranch populations with significant physical abnormalities.
  • Extreme environmental conditions and high levels of anthropogenic pollution are discussed as potential contributing factors.
  • Further research is warranted to understand the full impact of environmental stressors on elasmobranch development in the region.