Downstream drifting of Macrobrachium (Decapoda: Palaemonidae) larvae in the Shimanto River, Japan

This study was undertaken to clarify the downstream drifting of Macrobrachium larvae in the Shimanto River by 24-hour sampling. Stage I zoeae accounted for most larvae collected in fresh and brackish waters. M. formosense and M. japonicum dominated in brackish and fresh waters, respectively, while M...

Full description

Saved in:
Bibliographic Details
Published in:Plankton & benthos research 2021/11/17, Vol.16(4), pp.301-307
Main Authors: Hiraga, Hiroyuki, Azuma, Kensaku, Kusaka, Takahiro, Kinoshita, Izumi, Fujita, Shinji
Format: Article
Language:English
Subjects:
developmental stage
downstream migration
Macrobrachium larvae
starvation tolerance
yolk droplet
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study was undertaken to clarify the downstream drifting of Macrobrachium larvae in the Shimanto River by 24-hour sampling. Stage I zoeae accounted for most larvae collected in fresh and brackish waters. M. formosense and M. japonicum dominated in brackish and fresh waters, respectively, while M. nipponense occurred only in brackish waters. The amount of yolk droplets of M. formosense and M. japonicum reduced over time in freshwater. However, no larvae that had completely used up their yolks were observed. Even though M. japonicum larvae drifted from farther upstream than those of M. formosense, they had a higher residual amount of yolk droplets. Therefore, long-distance and long-time drifting in M. japonicum may be enabled by delaying the absorption rate of droplets.
ISSN:1880-8247
1882-627X
DOI:10.3800/pbr.16.301