The utility of near infrared spectroscopy for age estimation of deepwater sharks

Rigby, Cassandra L.; Wedding, B.B.; Grauf, S.; Simpfendorfer, Colin A.

doi:10.1016/j.dsr.2014.09.004

Cited by 22 publications

(23 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The issue of NIRS age predictions for older animals could not be resolved in the present study because no additional older individuals were available; however, it was addressed in subsequent work that extended the NIRS shark ageing research to deep-water shark species (Rigby et al 2014). Two dogfish species (Squalus megalops and S. montalbani) were traditionally aged up to 25 and 31 years respectively using band counts on their dorsal fin spines (DFS).…”

Section: Discussionmentioning

confidence: 98%

“…Vertebrae and fin clips were also removed from the same S. megalops animals aged by DFS because DFS annual band pair deposition had been verified for S. megalops (Braccini et al 2007). Scans of the three structures from S. megalops (DFS, vertebrae and fin clips) and the DFS from S. montalbani all produced NIRS calibration models with a good ability to predict ages up to the maximum ages of 25 and 31 years (Rigby et al 2014). In that study, the vertebrae themselves could not be aged by traditional age reading because growth bands were not visible, yet the DFS proxy ages from the same animals clearly indicated that chemical changes occurred in the vertebrae correlated with age up to the maximum ages in the study.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Novel method for shark age estimation using near infrared spectroscopy

Rigby

Wedding

Grauf

et al. 2016

Mar. Freshwater Res.

View full text Add to dashboard Cite

Accurate age determination is an important component of assessing and managing fish populations, yet traditional ageing using growth bands is time-consuming and has limitations. In the present study, an alternative approach to shark age estimation using near infrared spectroscopy (NIRS) was investigated using two species. The ages of Sphyrna mokarran and Carcharhinus sorrah vertebrae that had been traditionally aged and validated were successfully predicted up to 10 years of age using NIRS. The correlations between the known ages of the vertebrae and their near infrared spectra were strong, with R 2 values of 0.89 and 0.84 for S. mokarran and C. sorrah respectively. The major advantage of the NIRS ageing approach was the rapid speed of age estimation, which could enable large numbers of sharks to be aged quickly. This would offer the fisheries management benefit of improving the reliability of age information for stock and risk assessments.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Novel method for shark age estimation using near infrared spectroscopy

Rigby

Wedding

Grauf

et al. 2016

Mar. Freshwater Res.

View full text Add to dashboard Cite

show abstract

“…Thus, studies on deep‐sea catsharks (Correia & Figueiredo, ), skates (Natanson et al , ) and squaliform elasmobranchs (Clarke et al , ; Clarke & Irvine, ; Irvine et al , 2006 a , b , 2012; Cotton et al , ; Rigby et al , ), have not been successful at age validation. Irvine et al (2006 a , b ) described banding patterns in the dorsal‐fin spines of the southern lantern shark Etmopterus baxteri Garrick 1957 and the longnose velvet dogfish Centroselachus crepidater (Barbosa du Bocage & de Brito Capello 1864), in which there are more bands in larger specimens, but their age estimates have only been preliminarily validated for the latter using radiometric estimates of Fenton ().…”

Section: Validation Studies For Selected Speciesmentioning

confidence: 99%

“…While not an ageing or age validation technique, the recent use of near infrared spectroscopy (NIRS; Rigby et al , ; Rigby & Simpfendorfer, ) might become a useful analytical technique for elasmobranch age and growth studies. Unfortunately, the actual mechanism that NIRS uses in age and growth studies is still unclear, so it remains untested.…”

Section: The Future Of Elasmobranch Age and Growth Studiesmentioning

confidence: 99%

Perspectives on elasmobranch life‐history studies: a focus on age validation and relevance to fishery management

Cailliet

2015

Journal of Fish Biology

View full text Add to dashboard Cite

Life-history (age, growth, age validation, reproduction and demography) studies of elasmobranchs date back to the middle of the last century with major early contributions made by British fishery scientists. As predicted by Holden in the early 1970s, many sharks and rays can be vulnerable to fishery mortality because they grow slowly, mature late in life, reproduce infrequently, have relatively low fecundities and can have relatively long life spans. As has now been found, however, not all species exhibit these traits. Also, ageing structures (neural arches and caudal thorns), other than vertebrae and spines, have since been evaluated. Various methods for validating age and growth estimates have been developed and tested on numerous species of elasmobranchs. These include tag-recapture analyses, oxytetracycline injections, centrum or spine edge and marginal increment analyses, and bomb radiocarbon dating of calcified structures. Application of these techniques has sometimes not only validated relatively slow growth and long life span estimates, but also has produced other results. A brief historical perspective on the applications and limitations of these techniques for elasmobranchs is provided, along with a discussion of selected species for which these techniques worked well, did not work at all or have produced variable and conflicting results. Because many fishery management techniques utilize age or stage-specific information, often through demographic analyses, accurate information on the life histories of fished populations, especially age validation, is extremely important for the fishery management of these cartilaginous fishes.

show abstract

“…31,32 Applications of NIR spectroscopy in fisheries science are currently limited, with five published studies having focused on biological structures such as otoliths of marine fishes [33][34][35] or shark vertebrae. 36,37 Traditional approaches to determine fish age from otoliths are often time-consuming and expensive, and can include observational subjectivity. In contrast, NIR spectroscopy methods have shown the potential to increase the efficiency and improve the repeatability of ageing studies.…”

Section: Introductionmentioning

confidence: 99%

Classification of fish species from different ecosystems using the near infrared diffuse reflectance spectra of otoliths

Benson

Barnett

Helser

2020

Journal of Near Infrared Spectroscopy

View full text Add to dashboard Cite

Applications of Fourier transform near infrared (FT-NIR) spectroscopy in fisheries science are currently limited. This current analysis of otolith spectral data demonstrate the potential applicability of FT-NIR spectroscopy to otolith chemistry and spatial variability in fisheries science. The objective of this study was to examine the use of NIR spectroscopy as a tool to differentiate among marine fishes in four large marine ecosystems. We examined otoliths from 13 different species, with three of these species coming from different regions. Principal component analysis described the main directions along which the specimens were separated. The separation of species and their ecosystems may suggest interactions between fish phylogeny, ontogeny, and environmental conditions that can be evaluated using NIR spectroscopy. In order to discriminate spectra across ecosystems and species, four supervised classification model techniques were utilized: soft independent modelling of class analogies, support vector machine discriminant analysis, partial least squares discriminant analysis, and k-nearest neighbor analysis (KNN). This study showed that the best performing model to classify combined ecosystems, all four ecosystems, and species was the KNN model, which had an overall accuracy rate of 99.9%, 97.6%, and 91.5%, respectively. Results from this study suggest that further investigations are needed to determine applications of NIR spectroscopy to otolith chemistry and spatial variability.

show abstract

The utility of near infrared spectroscopy for age estimation of deepwater sharks

Cited by 22 publications

References 58 publications

Novel method for shark age estimation using near infrared spectroscopy

Novel method for shark age estimation using near infrared spectroscopy

Perspectives on elasmobranch life‐history studies: a focus on age validation and relevance to fishery management

Classification of fish species from different ecosystems using the near infrared diffuse reflectance spectra of otoliths

Contact Info

Product

Resources

About