Effects of Temperature on the Gastric Evacuation Rate and Maintenance Ration of Adult Pointhead Flounder Cleisthenes pinetorum

IF 0.7 4区 农林科学 Q4 FISHERIES
Sango Nishio, Orio Yamamura
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Abstract

We investigated the gastric evacuation rate (GER) and maintenance ration (MR) for the adult pointhead flounder Cleisthenes pinetorum (77–421 g) at 4°C, 9°C, and 14°C which reflect the bottom, middle, and surface temperatures of their habitat in early summer. GERs were obtained from gravimetric experiments with 34 flounders fed juvenile walleye pollock Gadus chalcogrammus as prey. A 169-day feeding experiment for 67 pointhead flounders fed krill Thysanoessa inermis was undertaken to measure MR. The effects of a 10°C temperature increase (Q10) on the GER and the MR were 6.55 and 2.04, respectively, indicating that the effect of temperature was greater on GER than on MR. As a result, the differences between the GER and MR, indicating the maximum amount of food ingestible for growth, were 2.8 and 30.7 cal·g−1 day−1 at 4 and 14°C, respectively. The water temperature on the sea floor generally remained at <4°C from winter through summer, but exceeded 10°C in the surface layer of Funka Bay, where pointhead flounders were sampled. Therefore, their growth rate should be considerably limited if they remain in the bottom layer. The unique ecology of this species among the flatfishes of floating from sea floor and feeding at pelagic zones may represent a strategy to compensate for the physiological limitation of growth at low temperatures.

Abstract Image

温度对成年尖头鲽胃排空率和维持口粮的影响
我们研究了点头鲽成鱼(77-421 g)在 4°C、9°C 和 14°C(反映了其初夏栖息地的底部、中部和表面温度)温度下的胃排空率(GER)和维持量(MR)。34 条比目鱼以幼年黑线鳕 Gadus chalcogrammus 为猎物,通过重力实验获得了 GER。还对以磷虾(Thysanoessa inermis)为猎物的 67 艘尖头笛鲷进行了为期 169 天的喂食实验,以测量 MR。温度升高10°C(Q10)对GER和MR的影响分别为6.55和2.04,表明温度对GER的影响大于对MR的影响。因此,在 4 和 14 摄氏度条件下,GER 和 MR 之间的差异分别为 2.8 和 30.7 cal-g-1 day-1,表明生长所需的最大摄食量。从冬季到夏季,海底水温一般保持在 4°C,但在取样的丰加湾表层,水温超过了 10°C。因此,如果它们停留在底层,其生长速度应该会受到很大限制。该物种在扁平鱼类中独特的生态学特性--从海底浮起并在中上层区域觅食--可能代表了一种在低温条件下补偿生长生理限制的策略。
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来源期刊
Journal of Applied Ichthyology
Journal of Applied Ichthyology 生物-海洋与淡水生物学
CiteScore
2.30
自引率
11.10%
发文量
73
审稿时长
3-8 weeks
期刊介绍: The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.
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