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Related Concept Videos

Osmoregulation in Fishes02:32

Osmoregulation in Fishes

When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?

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Updated: May 23, 2026

Implantation of a New Micro Acoustic Tag in Juvenile Pacific Lamprey and American Eel
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Recovery potential and conservation options for elasmobranchs.

C A Ward-Paige1, D M Keith, B Worm

  • 1Department of Biology, Dalhousie University, Halifax NS, B3H 4R2, Canada. globalshark@gmail.com

Journal of Fish Biology
|April 14, 2012
PubMed
Summary
This summary is machine-generated.

Elasmobranch (sharks and rays) populations are recovering due to reduced fishing and ecosystem changes like predator release. However, even low fishing rates can reverse these gains, highlighting the need for strong, long-term conservation management.

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Area of Science:

  • Marine Biology
  • Conservation Science
  • Fisheries Management

Background:

  • Elasmobranch populations have declined significantly due to overexploitation.
  • There's growing recognition of elasmobranchs' ecological and economic value, leading to conservation efforts.
  • The effectiveness of current management strategies for elasmobranch recovery remains uncertain.

Purpose of the Study:

  • To review and evaluate the current understanding of elasmobranch population recoveries.
  • To assess the drivers, rates, and timelines of population increases in elasmobranchs.
  • To identify successful management measures for elasmobranch population restoration.

Main Methods:

  • Literature review of elasmobranch population recoveries.
  • Analysis of population trends, recovery rates, and contributing factors.
  • Case study examination of specific elasmobranch recovery initiatives.

Main Results:

  • Predation release, not reduced fishing, was the primary driver for most observed elasmobranch population increases.
  • Low exploitation rates (2-6% annually) can impede recovery in managed populations.
  • Effective recovery measures include strict fishing limits, habitat protection, monitoring, and education.

Conclusions:

  • Elasmobranch recovery is achievable but requires sustained, multifaceted management interventions.
  • Dedicated conservation actions are crucial to reverse population declines and ensure long-term survival.
  • Continued monitoring and adaptive management are essential for successful elasmobranch conservation.