NDLI: Effect of saline water on early success of amphidromous fish

Content Provider	Springer Nature Link
Author	Iguchi, Kei’ichiro Takeshima, Hirohiko
Copyright Year	2010
Abstract	Organisms that migrate between rivers and the sea inevitably pass through estuarine habitats. Despite the potential importance of salinity and temperature fluctuations for metabolic adaptation, little is known about the impact of environmental changes in estuaries on the survival of residents. Ayu (Plecoglossus altivelis) is a migratory fish that inhabits estuarine brackish water in its early life stages. The recent decline in the abundance of populations ascending into rivers is of concern for local biodiversity. The present study aims to elucidate the ecological processes that determine the early success of Ayu larvae under variable environmental conditions. The effects of salinity and water temperature on the endogenous growth of newly hatched larvae from the same brood were examined experimentally based on morphological and metabolic characteristics. High salinity and high water temperature together appeared to require more energy for larval osmoregulation, resulting in the acceleration of yolk depletion and reduced growth of the notochord. Increasing the osmoregulative cost during the yolk-sac stage resulted in the faster induction of a state of starvation. Seawater is considered to have an adverse effect on the survival of newly hatched larvae, as it lowers the efficiency of foraging and predator avoidance due to an energetic tradeoff. More attention should be paid to the significance of estuarine environments involving brackish waters to ensure the early survival of amphidromous fish such as Ayu.
Starting Page	33
Ending Page	37
Page Count	5
File Format	PDF
ISSN	13418998
Journal	Ichthyological Research
Volume Number	58
Issue Number	1
e-ISSN	16163915
Language	English
Publisher	Springer Japan
Publisher Date	2010-11-30
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amphidromy Brackish water Endogenous growth Osmoregulation Yolk-sac larvae Freshwater & Marine Ecology Animal Systematics/Taxonomy/Biogeography Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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