Growth of bluefin tuna (Thunnus thynnus) in the North-eastern Atlantic and Mediterranean based on back-calculation of dorsal fin spine annuli

Landa, J.; Rodríguez‐Marín, E.; Luque, Patricia L.; Ruíz, M.; Quelle, P.

doi:10.1016/j.fishres.2015.06.002

Cited by 14 publications

(8 citation statements)

References 22 publications

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“…The precision of age estimates was higher for pelvic-fin spines in comparison with final ages than from any other structure tested. Furthermore, with the pelvic-fin spines used in this study, we did not find the core to be obscured by vascularization as has been seen in fin spines of other species (e.g., Keller Kopf et al, 2010;Kopf and Davie, 2011;Landa et al, 2015). Although the tautog in our study reached only age 12, we believe that the growth bands in the spines would be discernible in tautog of considerably older ages.…”

Section: Discussionsupporting

confidence: 52%

Identification of a nonlethal method for aging tautog (Tautoga onitis)

Elzey¹,

Trull²

2016

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Abstract-Aging of tautog (Tautoga onitis) has historically required sacrificing fish to obtain opercula and otoliths. Use of these structures for age determination has hindered researchers from obtaining samples from fish that were to be released alive, as well as from commercially collected fish that are commonly sold whole. In this study we evaluated the use of scales, dorsal-fin spines, pelvic-fin spines, opercula, whole sagittal otoliths, and sectioned sagittal otoliths as structures for age determination of tautog. Our results indicate that pelvic-fin spines provide high-precision age estimates without bias. Dorsal-fin spines had well-defined annuli, but vascularization near the core prevented consistent identification of the first annulus and led to biased ages. Scales were difficult to read and provided highly biased ages in older (>age 7) fish. The precision of age estimations derived from pelvic-fin spines was better than the precision of age estimations derived from the other structures. Pelvic-fin spines provide suitable age estimates for tautog, and these structures can be collected easily from a wider variety of sample sources than can the structures currently being collected for age determination of this species.

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Section: Discussionsupporting

confidence: 52%

Identification of a nonlethal method for aging tautog (Tautoga onitis)

Elzey¹,

Trull²

2016

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“…De Buen (1925 and Sella (1929) were the first European scientists to provide age data based on the study of hard parts (vertebrae). Later, Rooker et al (2007) cited ten papers on growth prepared on the eastern Atlantic and Mediterranean and a further seven on the western Atlantic carried out in the last six decades; others have been published on the same subject since, inlcuding Neilson and Campana (2008), Santamaria et al (2009), Secor et al (2009), Luque et al (2011), and Landa et al (2011Landa et al ( , 2012. Most of these papers are based on the von Bertalanffy (1938) growth function and show great variability in the parameter L ∞ , which varies from 257 cm according to Secor et al (2009), who studied bluefin tuna growth through the use of otoliths, to 499.7 cm according to Farrugio (1978) using the data of Sella (1929).…”

Section: Introductionmentioning

confidence: 99%

“…This use of similar equations represented a great advance with respect to previous assessments of the ABFT stocks, as up until then, two very different equations had been used (L t = 382 [1 -e −0.707 (t + 0.079) ]) (Turner and Restrepo, 1994) for the western stock and Cort (1991) for the eastern stock. However, two documents were presented to the SCRS ABFT group in 2011 Landa et al, 2011) that put forward alternative relationships for the eastern ABFT stock. These authors argued that, based on reported ABFT catch lengths, the estimated L ∞ = 382.7 cm and L ∞ = 341-348 cm were more reliable than the currently used L ∞ for this stock.…”

Section: Introductionmentioning

confidence: 99%

Determination ofL_maxfor Atlantic Bluefin Tuna,Thunnus thynnus(L.), from Meta-Analysis of Published and Available Biometric Data

Cort

Deguara²,

Galaz

et al. 2013

Reviews in Fisheries Science

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spanning most of the known Atlantic and Mediterranean Atlantic bluefin tuna fisheries dating from 1605 to 2011, give L values ranging from L min = 20 cm and L max = 330 cm. The results indicate that the parameter L ∞ = 318.85 cm of the growth equation used by ICCAT's Standing Committee on Research and Statistics Atlantic bluefin tuna assessment group for the eastern stock (Lt = 318.85 [1 -e −0.093 (t + 0.97) ]) lies within the confidence limits of the maximum Ls presented in the study: L max = 319.93 ± 11.3 cm, confirming that this equation perfectly fits the biology of the growth of this species. These conclusions are also valid for the equation for the western stock ]). The ICCAT Atlantic bluefin tuna database contains numerous records of Atlantic bluefin tuna L outside the biological feasibility, and solutions are provided to recognize and remove these outliers based on the application of fixed values of Fulton's condition factor (K) between 1.4 and 2.6 and appropriate L-W relationships to correct this situation in the future.

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“…Following this approach, comparing the mean length-at-age of ages 2, 3 and 4 (the most common age groups in the present study) with other studies, our estimates were similar to, or even greater than those found elsewhere, even though our estimate of L ∞ was the lowest reported (Table 4). Different values of the von Bertalanffy growth parameters can be calculated from similar mean length-at-age using different methods (Landa et al, 2015). Typically, comparative studies of population growth have relied on the use of indices, usually L ∞ and k, which may be misleading (Živkov et al, 1999).…”

Section: Growth and Maturitymentioning

confidence: 99%

Demographic variables and stock status of pike,Esox lucius, in the commercial fishery in the Anzali Wetland (SW Caspian Sea) near the southern limits of its distribution range

Moslemi-Aqdam

Namin

Sattari

et al. 2017

Aquat. Living Resour.

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The demographic variables of pike (Esox lucius) were studied at the southern edge of the species' distribution in the Anzali Wetland, south-western Caspian Sea. The main aim was to provide data for the assessment of the stock and to explore possible fisheries management measures such as setting minimum landing size based on length-at-maturity. Pike collected from commercial landings ranged from 15.4 to 75.4 cm in fork length (FL), from 52.9 to 3462.5 g in weight and were between 0 and 8 years old. Von Bertalanffy growth function parameters were L ∞ = 90.6 cm FL, k = 0.12 yr À1 and t 0 = À1.74 yr À1 . Male pike matured at 1-2 years with L 50 of 28.6 cm FL, whereas females matured at 2-3 years with a L 50 of 33.9 cm FL. Instantaneous total mortality (Z) was estimated as 0.93 yr À1 , while fishing mortality (F) was estimated to be 0.66 yr À1 . Yield-per-recruit analysis indicated that pike in the Anzali Wetland seems to be growthoverfished under the current fishing regime with no management measures, and substantial increases in yield could be achieved by increasing the length at first harvest. The results indicated that management actions such as enforced legislation are required to obtain a better stock status and higher yield. Management could be more effective if the number of fishers and their catch could be controlled, e.g., through the allocation of fishing licenses.

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Growth of bluefin tuna (Thunnus thynnus) in the North-eastern Atlantic and Mediterranean based on back-calculation of dorsal fin spine annuli

Cited by 14 publications

References 22 publications

Identification of a nonlethal method for aging tautog (Tautoga onitis)

Identification of a nonlethal method for aging tautog (Tautoga onitis)

Determination ofL_maxfor Atlantic Bluefin Tuna,Thunnus thynnus(L.), from Meta-Analysis of Published and Available Biometric Data

Demographic variables and stock status of pike,Esox lucius, in the commercial fishery in the Anzali Wetland (SW Caspian Sea) near the southern limits of its distribution range

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Growth of bluefin tuna (Thunnus thynnus) in the North-eastern Atlantic and Mediterranean based on back-calculation of dorsal fin spine annuli

Cited by 14 publications

References 22 publications

Identification of a nonlethal method for aging tautog (Tautoga onitis)

Identification of a nonlethal method for aging tautog (Tautoga onitis)

Determination ofLmaxfor Atlantic Bluefin Tuna,Thunnus thynnus(L.), from Meta-Analysis of Published and Available Biometric Data

Demographic variables and stock status of pike,Esox lucius, in the commercial fishery in the Anzali Wetland (SW Caspian Sea) near the southern limits of its distribution range

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Product

Resources

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Determination ofL_maxfor Atlantic Bluefin Tuna,Thunnus thynnus(L.), from Meta-Analysis of Published and Available Biometric Data