Fin-Spine Selection and Section Level Influence Potential Age Estimates of Striped Marlin (Kajikia audax)

Kopf, R. Keller; Davie, Peter S.

doi:10.1643/cg-10-021

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…The most common group collected in 2012 was age 6 (n = 8) and the oldest individual was age 8 (Table ). The assessment of age in billfish can be affected by the presence of a vascular zone in the dorsal spine . In this study, a vascular zone was present, but it was not very extensive; therefore, the age estimates were accurate.…”

Section: Resultsmentioning

confidence: 66%

“…The length of each striped marlin was measured (lower jaw fork length, in cm), the sex was identified, and the date of capture recorded. The extracted fourth dorsal fin spine, including the condyle, was used because this spine is most commonly used for determining age …”

Section: Methodsmentioning

confidence: 99%

“…A growth ring was defined as a wide opaque zone followed by a narrow translucent zone; a set of these two bands constituted an annual growth ring. Each ring completely encircled the cross‐section without partial separations and splits . The annual growth rings were counted using a stereomicroscope with transmitted light at a magnification of 10×.…”

Section: Methodsmentioning

confidence: 99%

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Stable carbon and nitrogen isotope values of dorsal spine age rings indicate temporal variation in the diet of striped marlin (Kajikia audax) in waters around Cabo San Lucas, Mexico

Acosta-Pachón

Ortega‐García

Graham

2015

Rapid Comm Mass Spectrometry

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Section: Resultsmentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Stable carbon and nitrogen isotope values of dorsal spine age rings indicate temporal variation in the diet of striped marlin (Kajikia audax) in waters around Cabo San Lucas, Mexico

Acosta-Pachón

Ortega‐García

Graham

2015

Rapid Comm Mass Spectrometry

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“…Koch et al (2008) compared sectioning locations along pectoral fin rays from Shovelnose Sturgeon Scaphirhynchus platorynchus and found that sections cut from the proximal end of the pectoral fin ray were more precise than those cut from more distal sections. Similarly, Kopf and Davie (2001) concluded that proximal sections cut along dorsal and anal spines of Striped Marlin Kajikia audax displayed a greater number of annuli and had a lower average percent error than sections cut more distally. For Channel Catfish Ictalurus punctatus, capturing the highest number of annuli in pectoral spines was best achieved near the base of the structure (Sneed 1951).…”

Section: Discussionmentioning

confidence: 96%

Influence of Sectioning Location on Age Estimates from Common Carp Dorsal Spines

Watkins

Klein

Terrazas

et al. 2015

N American J Fish Manag

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Dorsal spines have been shown to provide precise age estimates for Common Carp Cyprinus carpio and are commonly used by management agencies to gain information on Common Carp populations. However, no previous studies have evaluated variation in the precision of age estimates obtained from different sectioning locations along Common Carp dorsal spines. We evaluated the precision, relative readability, and distribution of age estimates obtained from various sectioning locations along Common Carp dorsal spines. Dorsal spines from 192 Common Carp were sectioned at the base (), immediately distal to the basal section (), and at 25% (), 50% (), and 75% (section 5) of the total length of the dorsal spine. The exact agreement and within‐1‐year agreement among readers was highest and the coefficient of variation lowest for . In general, age estimates derived from had similar age distributions and displayed the highest concordance in age estimates with . Our results indicate that sections taken at ≤ 25% of the total length of the dorsal spine can be easily interpreted and provide precise estimates of Common Carp age. The greater consistency in age estimates obtained from indicates that by using a standard sectioning location, fisheries scientists can expect age‐based estimates of population metrics to be more comparable and thus more useful for understanding Common Carp population dynamics. Received April 2014; Accepted March 31, 2015

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“…Spine morphology is one contributing factor that led to greater accuracy of ages from skin-cut sections. The base of the spine below the condyle groove is asymmetrical and highly resorbed and thus is not a good candidate for sectioning and ageing [15,47]. The preferred processing zone for a spine is distal from the base, in the region where the spine becomes more symmetrical (Figure 3).…”

Section: Utility For Nonlethal Samplingmentioning

confidence: 99%

Dorsal Fin Spines and Rays for Nonlethal Ageing of Goliath Grouper Epinephelus itajara

Carroll

Collins

Murie

2023

Fishes

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Atlantic Goliath Grouper, Epinephelus itajara, the largest grouper in the western North Atlantic, exhibits life history characteristics (e.g., it is slow-growing, long-lived, and late-maturing) that make it particularly susceptible to fishing pressure. Otoliths, the structure typically processed for age determination, are usually collected as part of fishery monitoring, but otoliths are not available from Goliath Grouper due to a harvest moratorium enacted in 1990 for United States waters. Alternative structures—such as dorsal fin rays or spines—can be acquired for ageing via nonlethal sampling and may provide reliable age estimates. Since 2006, the Florida Fish and Wildlife Conservation Commission (FWC) has been collecting incidental Goliath Grouper samples from mortality events including those from cold kills and red tides. Corresponding otolith, dorsal fin ray and dorsal fin spine samples were compared to determine the accuracy and precision of the external ageing structures. Marginal increment analyses indicated that annulus (translucent zone) deposition occurred primarily in March–June on spines and in April–June on rays. While ages determined from both rays and spines exhibited high precision, the accuracy compared to otolith ages was low as a result of systematic underageing of both external structures, particularly at the oldest age classes. A correction factor was applied to rays and spines that remedied the underageing, but the correction factor was more successful for spines. An analysis of ray and spine section accuracy based on nonlethal structure removal from the fish (i.e., comparing ages from sections at the base of the structure within the body to those sectioned from the external surface of the body) determined that spines can be accurately aged when sampled distal of the base of the structure, but that rays cannot. Nonlethal sampling and ageing of Goliath Grouper spines facilitated by public participation could address management goals and help determine the offshore population age structure. Simultaneously, it could contribute critical data needed for a traditional stock assessment, should such a path be warranted by the recovery or management of the species.

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Fin-Spine Selection and Section Level Influence Potential Age Estimates of Striped Marlin (Kajikia audax)

Cited by 9 publications

References 12 publications

Stable carbon and nitrogen isotope values of dorsal spine age rings indicate temporal variation in the diet of striped marlin (Kajikia audax) in waters around Cabo San Lucas, Mexico

Stable carbon and nitrogen isotope values of dorsal spine age rings indicate temporal variation in the diet of striped marlin (Kajikia audax) in waters around Cabo San Lucas, Mexico

Influence of Sectioning Location on Age Estimates from Common Carp Dorsal Spines

Dorsal Fin Spines and Rays for Nonlethal Ageing of Goliath Grouper Epinephelus itajara

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