Otolith measurement as a method of identifying factors affecting first-year growth and stock separation of mackerel (Scomber scombrus L.)

Dawson, Wendy A.

doi:10.1093/icesjms/47.3.303

Cited by 36 publications

(29 citation statements)

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“…3LMN. Differences in the first year growth has been associated with differences in the peak spawning time, environmental conditions and population size (Hopkins, MS 1986;Agnault, 1989;Dawson, 1991;Lombarte and Lleonart, 1993). Our results however indicate that this character is very stable in the Greenland halibut from Flemish Pass -Flemish Cap -Div.…”

Section: Discussionmentioning

confidence: 54%

“…The amount of growth in the first year can be measured from the otolith first annual ring diameter (L 1 ). Differences in the first year growth has been associated with differences in the spawning time (Dawson, 1991), and it has also been shown to vary between year classes, and to be linked with density dependence (Agnault, 1 9 8 9 ) . I n t h i s p a p e r, w e a n a l y s e w h e t h e r a difference exists between cohorts in the first annual growth that could be density related and whether geographic patterns in this variable exists.…”

Section: Introductionmentioning

confidence: 99%

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Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank)

Junquera¹,

Román²,

Paz³

et al. 1999

J. Northw. Atl. Fish. Sci.

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The Greenland halibut fishable stock has been declining substantially since late-1980s, according to both surveys and commercial fishery indices, particularly among the ages 10+, which corresponds to the females age at 50% maturity. In this paper the effect of this apparent reduction in the stock abundance on growth and reproductive parameters is examined.Among growth parameters, the analysis of the first year growth is undertaken both by cohort and by geographic areas, assuming that density dependence might be the most severe at younger age classes. This is made using records of the respective first annual ring otolith diameters. Other growth related index such as the condition factor is also analysed. Neither significant differences in the first year growth have been observed between areas analysed, nor between cohorts, during the period 1988 to 1996. Mean condition factor-at-age for ages 1 to 13 were stable during this same period. About the reproductive parameters, two aspects are considered: the interannual variations in length-at-maturity and in the potential fecundity. Female length at maturity varied between 64.5 and 69.5 cm. Female potential annual fecundity ranged between 15 000 and 158 000. It increases with female age, but the mean fecundity-at-age variations were not significant either between years of sampling or between cohorts.A common feature observed is the relative stability of those characteristic through the period analysed, which could support a certain resiliency of the life history traits in this species.

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank)

Junquera¹,

Román²,

Paz³

et al. 1999

J. Northw. Atl. Fish. Sci.

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“…Los resultados pueden traducirse a proporciones que indiquen el grado de mezcla y la predominancia de los grupos poblacionales. Otro procedimiento es caracterizar la morfometría del otolito para cada grupo poblacional y contrastarlas (Ihssen et uf., 1981;Grégoire y Castonguay, 1989;Dawson, 1991) o usar técni-cas discriminantes para separarlas. Los análisis morfomttricos pueden ofrecer un gran potencial en la separación de grupos poblacionales, incluso mas que los merísticos en algunas especies (Ihssen et al, 1981;Misra y Carcadden, 1987).…”

Section: Marca De Clase Le (Mm)unclassified

“…The results could translate into percentages that indicate the degree of mixing and +&edomi-nance of the stocks. Another procedure would be to characterize and compare the morphometry of the otolith for each stock (Ihssen et al, 1981;Grégoire and Castonguay, 1989;Dawson, 1991), or use discriminant techniques to separate them. Morphometric analyses have great potential for separating stocks, even more than meristic analyses for some species (Ihssen et al, 1981;Misra and Carcadden, 1987).…”

Section: Marca De Clase Le (Mm)mentioning

confidence: 99%

Evidence of different stocks of mackerel Scomber japonicus

Millán¹,

Velázquez²

1996

Cienc. Mar.

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Samples of the commercial catch of mackerel Scomber japonicus from Ensenada, Vizcaíno Bay, Magdalena Bay and the Gulf of California were analyzed to show biological evidence that supports a hypothesis of two stocks of mackerel. This evidence is the reproductive period, maturity cycle, deposition pattern of the otolith bands, length (L50%) and age (E50%) of reproduction and composition by length and age of the catch. Two stocks were identified, one that is distributed from southem California to Vizcaíno Bay and the other in the Gulf of California. Both stocks overlapped at Magdalena Bay, which seems be a feeding site where young individuals that have not been recruited to the spawning stock inhabit.

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“…Environmental differences and geographic separation of populations resulted in certain changes in fish otoliths (Lombarte 1992;Lombarte & Leonart 1993;Sadighzadeh et al 2014;Torres et al 2000;Vignon & Morat 2010). As a result, the shape properties of otoliths are widely used in descriptions of fish stocks (Campana & Casselman 1993;Dawson 1991).…”

Section: Introductionmentioning

confidence: 99%

Otolith Shape Analyses and Dimensions of the Anchovy Engraulis encrasicolus L. in the Black and Marmara Seas

Zengin¹,

Saygın²,

Polat³

2015

JSM

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Otolith measurement as a method of identifying factors affecting first-year growth and stock separation of mackerel (Scomber scombrus L.)

Cited by 36 publications

References 0 publications

Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank)

Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank)

Evidence of different stocks of mackerel Scomber japonicus

Otolith Shape Analyses and Dimensions of the Anchovy Engraulis encrasicolus L. in the Black and Marmara Seas

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