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• W1907171804 abstract "Seasonal changes in sea temperature levels affect the swimming performance of fish. This study investigates if a change of 5iC from 7 to 12iC in water temperature has a significant effect on the maximum swimming performance of whiting, Merlangius merlangus, which is one of the most common species caught in the bottom trawl fisheries of the North Sea. The effect of this seasonal change on swimming performance was shown by two experiments. A temperature increase from 7iC to 12iC was shown to cause a decrease in the minimum twitch contraction time of the lateral muscle, when stimulated by an electric pulse, from 45.8ms to 33.9ms. This gives a maximum tail beat frequency of 10.9Hz at 7iC rising to 14.7Hz at 12iC. In the second set of experiments, the escape response of fish to sound stimuli at these two temperatures was investigated. The Mauthner Escape Reflexes of the fish were found to be significantly slower at 7iC than at 12iC. Mean escape latency at 12iC (27.6) was significantly shorter than that at 7iC (34.8) (t test, P< 0.001). The mean value of the time taken to complete stage 1 at 12iC (45.6ms) was significantly faster than that at 7iC (57.7ms) (t test, P< 0.001). Similarly, the mean value of the time taken to complete stage 2 at 12iC (119.9ms) was significantly faster than that at 7iC (154.3ms) (t test, P< 0.05). The general underlying physiological effect of a temperature increase of 10iC was to almost double the speed of fish maximum swimming ability (Q10iC =1.81). The results of these experiments have shown that, due to low water temperature, the maximum swimming speed of whiting in late winter and spring is lower than that in late summer and autumn. Ozet: Deniz suyu s›cakl›¤›ndaki mevsimsel deifliklikler, bal›klar›n yuzme performanslar›n› etkilemektedir. Bu cal›flmada su s›cakl›¤›nda 7iC ile 12iC aras›ndaki 5iC lik fark›n, Kuzey Denizi dip trolu avc›l›¤›nda en yayg›n yakalanan turlerden biri olan, Merlangius merlangus'un maksimum yuzme performans›na belirgin bir etkisi olup olmad›¤› araflt›r›lm›flt›r. Bu mevsimsel deiflimin yuzme performans›na etkisi iki deneyle gosterilmistir. 7iC den 12iC ye kadar olan s›cakl›k art›fl›, yanal kaslar›n, bir elektirik pals›yla uyar›ld›¤›nda, minimum kas›lma surelerinin 45.8ms den 33.9ms ye kadar duflmesine sebep olduu gorulmufltur. Bu deerler bal›¤›n maksimum kuyruk c›rpma frekans›n›n 7iC de 10.9Hz iken 12iC de 14.7Hz'e yukseldii sonucunu vermektedir. ‹kinci gurup deneylerde, bal›¤›n bu s›cakl›klarda sesle urkutmelere verdii kacma tepkisi incelenmifl, ve 7iC deki Mauthner Kacma Reflexlerinin 12iC dekinden onemli derecede daha yavafl olduu bulunmustur. Sesin verilmesi ile kacma bafllang›c› aras›ndaki ortalama surenin 12iC de (27.6) 7iC dekinden (34.8) onemli derecede daha k›sa olduu bulunmufltur (t test, P< 0.001). Bal›klar›n ilk kuyruk c›rp›m›n›n birinci aflamas›n› tamamlamak icin gecen ortalama zaman›n 12iC de (45.6ms) 7iC dekinden (57.7ms) onemli derecede daha h›zl› olduu bulunmufltur (t test, P< 0.001). Benzer flekilde ikinci aflama icinde yine 12iC deki ortalama zaman›n (119.9ms) 7iC dekinden (154.3ms) onemli derecede daha h›zl› olduu bulunmufltur (t test, P< 0.05). 10iC lik bir s›cakl›k art›fl›n›n sebep olduu genel fizyolojik etki bal›¤›n maximum yuzme h›z›n› hemen hemen iki kat artt›rm›flt›r (Q10iC =1.81). Bu deneylerin sonuclar› Kuzey Denizi mezgit bal›¤›n›n dufluk su s›cakl›¤› sebebiyle k›fl sonu ve ilkbahardaki en yuksek yuzme h›z›n›n yaz sonu ve sonbahara nispeten daha dufluk olduunu gostermifltir." @default.
• W1907171804 created "2016-06-24" @default.
• W1907171804 creator A5054252066 @default.
• W1907171804 date "2002-02-01" @default.
• W1907171804 modified "2023-09-23" @default.
• W1907171804 title "Effect of Temperature Change on Maximum Swimming Speed of Whiting, Merlangius merlangus (Linnaeus, 1758)" @default.
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