Using otolith microstructure analysis in studies on the ecology of the early life stages of cod, Gadus morhua L.: A review

Spich, Katarzyna; Fey, Dariusz P.

doi:10.1016/j.fishres.2022.106265

Cited by 2 publications

(2 citation statements)

References 47 publications

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“…Once extracted, the otoliths were placed on basic microscope slides and embedded in DEPEX (Electron Microscopy Sciences Hatfield, PA). The ages of cod larvae and juveniles were determined based on the number of micro-increments between the centre of the otolith and the edge (left or right, depending on which had more legible microstructures) (Spich and Fey 2022). Assumptions regarding the daily frequency of growth increment deposition in cod had previously been verified (Geffen 1995;Steffensen 1980;Hüssy et al 2003).…”

Section: Laboratory Procedures: Larval and Juvenile Codmentioning

confidence: 99%

Annual, seasonal and spatial differences in the growth rate of Baltic cod larvae and early juveniles in relation to zooplankton biomass fluctuations in 2006-2014

Spich,

Fey

2023

OandHS

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It is an acknowledged theory that a faster growth rate, determined by various environmental drivers, may boost the survival of larval and juvenile fish. In this study we examined the differences in the growth rate of larval and juvenile cod (age 2 – 136 d; SL: 4.1 – 39.2 mm) between the years 2006 and 2014, sub-areas of the Baltic Sea (Bornholm Basin, BB; Słupsk Furrow, SF; Gdańsk Basin, GB), and seasons (spring and summer). The average growth rate for all specimens was 0.25 mm/d, with significantly lower values between 2012 and 2014 than between 2006 and 2011. A reduction in zooplankton biomass, especially the large zooplankton fraction, was observed after the 2006–2008 period, which was related to the prevailing temperature conditions in the surface layers. The reduction in zooplankton biomass was accompanied by changes in the structure of zooplankton: less T. longicornis, C. hamatus, and Pseudocalanus spp., and more Acartia spp. The results suggest that the inter-annual differences observed in zooplankton biomass and structure are likely responsible for the observed reduction in the growth rate of cod larvae between 2012 and 2014 compared to the years between 2006 and 2011. The growth rate reduction could be one of the reasons for the decline in the recruitment of eastern Baltic cod between the years 2013 and 2015, after the high recruitment years of the period 2011-2012.

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Section: Laboratory Procedures: Larval and Juvenile Codmentioning

confidence: 99%

Annual, seasonal and spatial differences in the growth rate of Baltic cod larvae and early juveniles in relation to zooplankton biomass fluctuations in 2006-2014

Spich,

Fey

2023

OandHS

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“…Te researchers assessed the growth of the larval stage in detail by daily incremental analysis of otoliths [14][15][16][17]. Some studies show that otolith microstructure data can be used to reveal the impact of the environment on the growth of young fsh, the transfer process between life stages, and the performance of young survival in specifc habitats [18][19][20]. No relevant studies have been reported to discern the early life history of H. yarkandensis by otolith daily increments.…”

Section: Introductionmentioning

confidence: 99%

Differences in Otolith Microstructure between Reared and Wild Hedinichthys yarkandensis

Xia,

Wang,

Wang

et al. 2023

Journal of Applied Ichthyology

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In this study, a significant difference was demonstrated between the otolith increments of wild and reared Hedinichthys yarkandensis (day, 1877) P < 0.05 . By comparing the width of the first 40 daily increments of otoliths, it was found that the otolith width of the wild H. yarkandensis was significantly wider than that of the reared H. yarkandensis. The otolith daily increment width of wild H. yarkandensis tends to increase significantly with age and then decreases slowly, while the otolith daily increment width of reared H. yarkandensis grows more steadily. This may be related to the different growing conditions of the two groups. This study investigates the relationship between the early life history of H. yarkandensis and the daily otolith increment and provides a basis for identifying fish groups and fish life histories through differences in otolith microstructure.

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Using otolith microstructure analysis in studies on the ecology of the early life stages of cod, Gadus morhua L.: A review

Cited by 2 publications

References 47 publications

Annual, seasonal and spatial differences in the growth rate of Baltic cod larvae and early juveniles in relation to zooplankton biomass fluctuations in 2006-2014

Annual, seasonal and spatial differences in the growth rate of Baltic cod larvae and early juveniles in relation to zooplankton biomass fluctuations in 2006-2014

Differences in Otolith Microstructure between Reared and Wild Hedinichthys yarkandensis

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