Validation of the first annual increment deposition in the otoliths of European anchovy in the Bay of Biscay based on otolith microstructure analysis

Aldanondo, Naroa; Cotano, Unai; Álvarez, Paula; Uriarte, Andrés

doi:10.1071/mf15083

Cited by 12 publications

(21 citation statements)

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“…In addition, the combination of the study of the 1984 and 1989 year classes in catches with direct monitoring of several year classes between 1987 and 1992 in surveys concluded the validation procedure, because the strong increases in the population between years ought to be due to sharp increases in populations at age-1 (with Type I otoliths), as was, in fact, found by the surveys. The use of microstructure analysis by Aldanondo et al (2016) has added a new validation of the first annulus deposition for this anchovy. Finally, our former validation of yearly growth patterns was confirmed and complemented with the monitoring of the occurrence of edge types throughout the year (Fig.…”

Section: Validation Methodsmentioning

confidence: 99%

“…Beyond this, recent studies on otolith micro-increment formation of this anchovy have enabled the daily rhythm of deposition to be established in larvae (Aldanondo et al 2008), as well as in juveniles and adults (Cermeño et al 2003), and the method for otolith daily increment examination (Cermeño et al 2008). A validation of the formation of the first annulus for this anchovy is also presented in this special issue by daily increment examination of reared juveniles (Aldanondo et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Validation of age determination using otoliths of the European anchovy (Engraulis encrasicolus L.) in the Bay of Biscay

Uriarte

Rico

Villamor

et al. 2016

Mar. Freshwater Res.

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Abstract. Validation of the age determination procedure using otoliths of European anchovy in the Bay of Biscay was achieved by monitoring very strong year-classes in successive spring catches and surveys, as well as the seasonal occurrence of edge types. Historical corroboration of the ageing method was obtained by cross-correlation between successive age groups by year-classes in catches and surveys . Summary annual growth in length is also presented. Yearly annuli consist of a hyaline zone (either single or composite) and a wide opaque zone, disrupted occasionally by some typical checks (mainly at age-0 and age-1 at peak spawning time). Age determination, given a date of capture, requires knowledge of the typical annual growth pattern of otoliths, their seasonal edge formation by ages and the most typical checks. Most opaque growth occurs in summer and is minimal (translucent) in winter. Opaque zone formation begins earlier in younger fish (in spring), and this helps distinguish age-1 from age-2þ.

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Section: Validation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of age determination using otoliths of the European anchovy (Engraulis encrasicolus L.) in the Bay of Biscay

Uriarte

Rico

Villamor

et al. 2016

Mar. Freshwater Res.

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“…The habitat conditions of the Bay of Biscay are characterized by higher riverine input nutrients and higher productivity 25 compared to the oligotrophic Mediterranean waters 26,27 . Otherwise, the strong influence of habitat condition (e.g., primary production and temperature variability) in shaping otolith and growth rate was already detected for anchovy both in the Strait of Sicily 28,29 and in the Bay of Biscay 24,30 . Therefore, validation studies for a single species should also consider the ecosystem variability, since it has been observed that the growth pattern could change among different habitat conditions 12,13 .…”

mentioning

confidence: 97%

“…The use of combined information from different sources (fishery dependent or not) into a single holistic approach to corroborate or validate the annulus formation was already tested on different fish species, e.g. for Atlantic horse mackerel (Trachurus trachurus) 21 and for red mullet (Mullus barbatus) 22 , as well as for both wild and reared anchovy in the waters of the Bay of Biscay 14,23,24 . The habitat conditions of the Bay of Biscay are characterized by higher riverine input nutrients and higher productivity 25 compared to the oligotrophic Mediterranean waters 26,27 .…”

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confidence: 99%

First annulus formation in the European anchovy; a two-stage approach for robust validation

Basilone

Barra

Ferreri

et al. 2020

Sci Rep

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the age determination in fast-growing short-living species, such as european anchovy (Engraulis encrasicolus), has been widely recognized as a difficult task and bias introduced by readers leads to bias in reconstructing the population age structure. in this context, it is worth to note that age structure of fish population represents key information in fishery ecology and for stock assessment models. The uncertainty in estimating the age of the European anchovy by otolith reading is linked to the number of false-growth increments (checks) laid down before the annulus formation. While direct validation methods (e.g. mark-recapture, rearing, radiochemical dating) are difficult to implement specially for this short living species, the use of different indirect methods, supported by a coherent statistical approach, represents a robust and easier validation tool. A statistical modeling approach has been here adopted to assess the coherence of two well-known methods, namely Edge Analysis and Marginal Increment Analysis, in order to validate the first annulus formation in European anchovy. Both methodologies in two different yearly cycles converged toward the same result, thus confirming the annulus identification for the first year class. In addition, the completion dates of the checks and the first annulus were computed in order to gain a better insight into otolith growth dynamic. According to the species spawning period, the completion date of the first annulus falls in the summer period, while the first and second checks completion dates were mostly found in summer and winter respectively. General additive models using marginal increments as dependent variable showed a significant effect of the month, highlighting the presence of only one clear minimum in July/August, as well as specific relationships with condition factor and gonadosomatic index. Modeling the otolith edge morphology, the probability to find a hyaline band displayed in both years a similar shape, characterized by a minimum in July/August and higher values between november and January. the obtained results evidenced temporally coherent patterns providing a better insight in the otolith growth dynamic as well as a more robust validation of the first annulus formation in the European anchovy. Otolith annual growth increments, composed of alternating opaque and translucent zones, are commonly used to determine the age of fishes since 1899 1. However, counting annuli was sometime misleading in estimating the age of tropical or deep-sea adult fishes, mainly due to a more stable environment leading to more constant growth, thus resulting in less certain annulus formation 2. Erroneous age estimates can negatively affect management of marine resources, since several biological variables such as growth-rate, mortality rate and productivity are obtained by the age structure of the population 3-5. Age determination in short living species, such as anchovies, is further complicated because of the predominance of young fishes (0, 1 or 2 years old), which often ...

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“…Recently, individual data have been used for direct validation. The seasonal and annual formation of opaque zones has been investigated using the mark and recapture method (Szedlmayer and Beyer 2011;Cavole and Haimovici 2016;Peel et al 2016) coupled with daily growth increments (Cavole and Haimovici 2016;Aldanondo et al 2016). These studies determined that opaque zones were formed following the spawning period.…”

Section: Type Amentioning

confidence: 99%

A description of four types of otolith opaque zone

Katayama

2018

Fish Sci

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Analysis of the alternating opaque and translucent zones in fish otoliths is a widely used method to determine age in fish. The mechanisms underlying the annual periodicities in the formation of these zones remain unknown, although various interpretations and explanations have been presented to explain the appearance of the opaque zones. Here I review the biological and structural characteristics of the opaque zones in otoliths from a number of fish species. The results of this review suggest that the opaque zones can be classified into four different types. Type A is a dark opaque zone, displaying minute, dense crystals, and is typically formed at a young life-history stage. Type B comprises an aggregation of grooves and discontinuous crystals that are formed during growth-stagnant periods. Type C can be described as a washy black zone that has the appearance of an object that is smeared with ink; it is formed during seasons of active growth. Type D has deep grooves, appears luminous in transmitted light in etched otolith sections, and is formed during the spawning season. Types A and C otolith opaque zones are typical of younger fish and are formed during growing periods. They are complementary to Types B and D otolith opaque zones which are formed during periods of stagnant growth and/or during the spawning seasons and which are typical of older fish, which generally lack Type A zones. To ensure precise age determination in fish, it is therefore necessary to understand the structural and biological characteristics that produce these four distinct types of opaque zones.

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Validation of the first annual increment deposition in the otoliths of European anchovy in the Bay of Biscay based on otolith microstructure analysis

Abstract: Abstract. In order to validate the first annual increment deposition in European anchovy otoliths, early juveniles were captured in October 2012 in the southern Bay of Biscay. These individuals were maintained under a continuous feeding regimen in a sea cage over a period of 6 months. From

Cited by 12 publications

References 50 publications

Validation of age determination using otoliths of the European anchovy (Engraulis encrasicolus L.) in the Bay of Biscay

Validation of age determination using otoliths of the European anchovy (Engraulis encrasicolus L.) in the Bay of Biscay

First annulus formation in the European anchovy; a two-stage approach for robust validation

A description of four types of otolith opaque zone

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