Sea Cucumber Research Reveals Vulnerable Life-History Traits

Strategic Insights -

Researchers from Southern Cross University, in collaboration with colleagues from other institutions, have conducted a study on the white teatfish, a high-value species of sea cucumber. The investigation aimed to determine growth rates and life-history parameters essential for conservation planning and fishery management. The study found that the white teatfish is a slow-growing species with a considerable lifespan, requiring highly conservative management and conservation measures due to its vulnerable life-history traits.

Key Takeaways:

  • The white teatfish (Holothuria fuscogilva) is a high-value species listed on CITES Appendix II and widely harvested.
  • The species is characterized by slow growth, with an average growth rate of 220 g (total whole weight) or 1.4 cm (total length) per individual.
  • The study used a photographic mark-recapture method to measure growth of wild white teatfish in New Caledonia, with ex situ measurements weakly corresponding with in situ measurements.
  • Bidimensional metrics of body size using ex situ measures provided the most reliable predictions of body weight.
  • Length-weight relationships for H. fuscogilva varied greatly among data from different regions, including New Caledonia, French Polynesia, Torres Strait (Australia), and the Coral Sea.
  • Age-at-first-sexual-maturity was estimated at 15-23 years, and longevity at 57 years, based on modeling using the Electronic Length Frequency Analysis (ELEFAN) routine.
  • The growth coefficient (K) was estimated at 0.082 y^-1, and natural mortality rate (M) was approximated at 0.19 y^-1.
  • The research concluded that management and conservation measures for teatfish sea cucumbers (subgenus Microthele) should be highly conservative in light of their vulnerable life-history traits.

Statistics:

  • 67 animals were photographically marked, of which 7 were recaptured 13 months later.
  • The average growth rate of 220 g (total whole weight) or 1.4 cm (total length) per individual.
  • The estimated growth coefficient (K) was 0.082 y^-1.
  • The estimated natural mortality rate (M) was 0.19 y^-1.
  • Age-at-first-sexual-maturity was estimated at 15-23 years.
  • Longevity was estimated at 57 years.

Sources:

  • NewsRx. Studies from Southern Cross University in the Area of Fisheries Research Described (Growth and Life-history Parameters of the High-value Sea Cucumber, holothuria Fuscogilva). Life Science Weekly. November 4, 2025; p 7077.
  • Growth and Life-history Parameters of the High-value Sea Cucumber, holothuria Fuscogilva. Fisheries Research, 2025;291.