Retrospective analysis of growth in pink salmon Oncorhynchus Gorbuscha using scales: Regional variability

Kaev, A. M.

doi:10.1134/s0032945215030054

Cited by 11 publications

(6 citation statements)

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“…The number of circuli up to and including the last winter circuli in the pink salmon scales in this study (14-26 circuli, mean 18 circuli) was similar to the results of Myers (1994) and Kaev (2015b). However, there appears to be regional and temporal variation, as Kaev (2015b) found a higher mean number of circuli (n = 23) in the north-western Pacific in 1997 and 2011.…”

Section: Discussionsupporting

confidence: 89%

“…According to the scale patterns, this period may consist of three stages: (a) declining growth, (b) stable or increasing growth and (c) declining growth. Analysis of pink salmon scales from their native area in the north-western Pacific indicates a similar temporal pattern (Kaev, 2015a(Kaev, , 2015b. The scale growth patterns indicated a declining growth during the first few weeks of marine life.…”

Section: Discussionmentioning

confidence: 82%

“…for pink salmon that circuli spacing truly reflects length increment (Kaev, 2015b). It is not known whether circuli are formed at fixed time intervals, which would imply that scale growth reflects growth in length through the full growth period, as suggested by Courtney et al (2000).…”

Section: Discussionmentioning

confidence: 98%

“…The distance between circuli in the scale reflects the growth rate of the fish (Courtney et al, 2000). Kaev (2015b) found a positive correlation between pink salmon size and the scale circuli spacing. Thus, analysing the distance between circuli in pink salmon scales can reveal the growth rate during the various life stages.…”

mentioning

confidence: 91%

“…Thus, survival at sea is linked to marine ecosystem conditions, particularly water temperatures optimal for growth, and the quantity and quality of available prey (Moss et al, 2005;Radchenko et al, 2018). Studies of marine growth and survival have been performed in the native range in the Pacific Ocean (Kaev, 2015a(Kaev, , 2015bMyers, 1994;Radchenko et al, 2018). Studies from the north Pacific Ocean may not be representative for the descendants of introduced pink salmon that migrate to the Barents Sea and North Atlantic Ocean, where environmental conditions are different.…”

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confidence: 99%

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Growth of invasive pink salmon (Oncorhynchus gorbuscha) at sea assessed by scale analysis

Paulsen

Sandlund

Østborg

et al. 2021

Journal of Fish Biology

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Invasive pink salmon (Oncorhynchus gorbuscha) has been present in variable, but low, numbers in Norwegian waters since c. 1960, but beginning in 2017 their numbers have exploded in rivers in northern Norway, with considerable numbers also recorded in rivers in southern Norway and other countries bordering the North Atlantic. Analysis of pink salmon scales from two rivers draining to the western Barents Sea showed declining growth during the first weeks after entering the sea, and some individuals even showed a pronounced growth arrest, based on detailed scale circulus analyses. This was followed by a period of growth increase and stability during late summer and autumn, which may reflect a transition to better food sources, as the fish migrate from coastal waters to the open ocean, and as they grow larger and can eat larger and more energy efficient food items. Growth declined to a minimum during winter. Fish body size at spawning was positively correlated with the distance from scale focus to the last winter circulus, as well as with the number of circuli. When dividing scale growth into three periods, better growth during the first period at sea was related to increased fish body length at spawning, but this early growth explained only a minor part (6%) of the variation in final body length.The reason for this may be large individual variation in growth combined with large mortality during the first weeks at sea. If mortality is selective, removing fish with poor growth may reduce a correlation between early growth and body size at spawning. Scale growth during late summer and early autumn explained more of the variation in fish length at spawning (27%). Hence, late summer and early autumn was likely an important period for marine growth and survival in the invasive pink salmon.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 98%

mentioning

confidence: 91%

mentioning

confidence: 99%

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