Age determination of orange roughy,Hoplostethus atlanticus (Pisces: Trachichthyidae) using210Pb:226Ra disequilibria

@article{Fenton1991AgeDO,
  title={Age determination of orange roughy,Hoplostethus atlanticus (Pisces: Trachichthyidae) using210Pb:226Ra disequilibria},
  author={Gwen Elizabeth Fenton and Stephen A. Short and David A. Ritz},
  journal={Marine Biology},
  year={1991},
  volume={109},
  pages={197-202}
}
Natural levels of210Pb:226Ra in otoliths of orange roughy,Hoplostethus atlanticus, from south-east Australian waters, were measured to determine fish ages radiometrically. Up to maturity, radiometric age estimates were consistent with a single constant otolith growth rate. Radiometric ages for juveniles were comparable with, but greater than, those obtained in a recent, validated New Zealand study which employed counts of annuli on the surface of otoliths. Beyond maturity, radiometric ages were… 
Loss of 222Rn from Otoliths of Orange Roughy, Hoplostethus atlanticus, Invalidates Old Ages
TLDR
Fish age estimation based on 210Pb: 226Ra ratios in fish otoliths has been applied to a number of species, including the orange roughy Hoplostethus atlanticus, and the dogma of old age and slow growth depends heavily on the radionuclide age validation procedure.
Background and review of ageing orange roughy (Hoplostethus atlanticus, Trachichthyidae) from New Zealand and elsewhere
TLDR
The weight of current evidence indicates that orange roughy are a slow‐growing, long‐lived species, and highlights the complexities of ageing long‐living species.
Lead–radium dating of orange roughy (Hoplostethus atlanticus): validation of a centenarian life span
TLDR
An improved lead-radium dating technique provided independent age estimates from sagittal otoliths, indicating that fish in the oldest age group were at least 93 years old, providing robust support for a centenarian life span.
Development and Depth Distribution of the Eggs of Orange Roughy, Hoplostethus atlanticus (Pisces : Trachichthyidae)
TLDR
The eggs of orange roughy (Hoplostethus atlanticus), a mid-slope benthopelagic fish, were fertilized and incubated at three temperatures, and their development rate was similar to that of eggs of fish from other orders and of shallower- living species.
Age and growth of the Pacific grenadier (Coryphaenoides acrolepis) with age estimate validation using an improved radiometric ageing technique
Current and historic longevity estimates for the Pacific grenadier ( Coryphaenoides acrolepis) range from 6 to greater than 60 years. Age estimates in this study using growth increment counts in thin
Preliminary estimates of the age and growth of immature smooth oreo Pseudocyttus maculatus Gilchrist 1906 (Oreosomatidae) in the Falkland Islands region of the South Atlantic
TLDR
It is suggested that these zones correspond to the two growth phases in the life history of this species, namely the pelagic juvenile phase (opaque zone) and the demersal sub-adult/adult phase (translucent zone).
Morphometric and meristic comparison of orange roughy (Hoplostethus atlanticus: Trachichthyidae) from the Puysegur Bank and Lord Howe Rise, New Zealand, and its implications for stock structure
TLDR
Significant morphological differences were found between orange roughy, Hoplostethus atlanticus, caught in 1993 on the Puysegur Bank and those caught on the Lord Howe Rise, New Zealand, suggesting that morphometric analysis may be a useful tool for distinguishing New Zealandorange roughy stocks.
Distribution and Biology of Orange Roughy (Hoplostethus atlanticus Collett 1889) in the Northwest Atlantic
TLDR
Distribution patterns and other consistencies suggest that northwest Atlantic orange roughy are a western fringe component of the northeast Atlantic population, similar to that in the Northeast Atlantic.
A review of orange roughy Hoplostethus atlanticus fisheries, estimation methods, biology and stock structure
TLDR
Three management lessons are suggested for developing orange roughy fisheries based on the Namibian experience: imposition of catch limits during exploratory fishing, starting the acoustic surveys earlier in the fishery, if possible, and greater reliance on trends in catch rate until a survey series has been established.
Age estimation and lead–radium dating of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
TLDR
Growth-zone counts indicated Antarctic toothfish live to at least 39 years of age, and were in close agreement with the chronometer, validating the age estimation criteria and the accuracy of age estimates.
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TLDR
It is suggested that maximum age may exceed 50 years, the instantaneous rate of natural mortality is probably below 0.10, and spawning success may be highly variable, which makes orange roughy susceptible to overfishing.
Confirmation of longevity in Sebastes diploproa (Pisces: Scorpaenidae) from 210Pb/226Ra measurements in otoliths
TLDR
Estimates of longevity in the genus Sebastes near 80 yr are confirmed because the magnitude of the 210Pb/226Ra radioactive disequilibrium in each otolith group, when compared to the number of growth-Zones and the otolith weight histories derived with the two techniques, identifies the growth-zones revealed by otolith sections as annual features.
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TLDR
Results showed that 226Ra was not incorporated at a constant rate throughout the life of M. novaezelandiae, anduptake was greater in juveniles than in adult fish.
Stock discrimination of orange roughy,Hoplostethus atlanticus, by parasite analysis
TLDR
It is concluded that Hoplostethus atlanticus is a sedentary species with little movement between fishmanagement zones.
The fine structure of check rings in the otolith of the New Zealand orange roughy (Hoplostethus atlanticus)
Abstract Heating otoliths of the orange roughy (Hoplostethus atlanticus; Trachichthyidae) by the break‐and‐burn method causes a crystal transformation from aragonite to calcite. However, the change
New Information on the Longevity of Pacific Ocean Perch (Sebastes alutus)
A comparison of ages determined from surfaces of otoliths and from sections of otoliths showed that ages were similar up to a section age of 22–24 yr. The growth pattern observed on thin sections of
Phase Differences between Check Ring Locations in the Orange Roughy Otolith (Hoplostethus atlanticus)
Orange roughy (Hoplostethus atlanticus) otoliths were shown to have two different mineral phases of aragonite in the upper (anti-sulcul) and lower (sulcul) parts of medio-lateral sections of
210Pb/226Ra determination of longevity in redfish
TLDR
A radiochemical assay of the otolith core was used to confirm the interpretation of annuli in Atlantic redfish, Sebastes mentella, to at least an age of 65 yr, and it appears that redfish live to a age of at least 75 yrs in the waters off of Nova Scotia.
Size‐fecundity relationships in the orange roughy, Hoplostethus atlanticus
TLDR
The comparatively lower fecundity of orange roughy combined with an apparently high age at maturity make this species potentially Susceptible to overfishing.
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