Spawning ground and larval transport processes of jack mackerel Trachurus japonicus in the shelf-break region of the southern East China Sea

2008 ◽  
Vol 28 (18) ◽  
pp. 2574-2583 ◽  
Author(s):  
Chiyuki Sassa ◽  
Youichi Tsukamoto ◽  
Kou Nishiuchi ◽  
Yoshinobu Konishi
Keyword(s):  
East China Sea ◽  
Transport Processes ◽  
Shelf Break ◽  
Larval Transport ◽  
East China ◽  
Spawning Ground ◽  
Jack Mackerel ◽  
Trachurus Japonicus ◽  
Southern East China Sea ◽  
Break Region

scholarly journals Interannual variations in distribution and abundance of Japanese jack mackerel Trachurus japonicus larvae in the East China Sea

2016 ◽  
Vol 73 (4) ◽  
pp. 1170-1185 ◽  
Author(s):  
Chiyuki Sassa ◽  
Motomitsu Takahashi ◽  
Yoshinobu Konishi ◽  
Youichi Tsukamoto
Keyword(s):  
East China Sea ◽  
East China ◽  
Late Winter ◽  
Larval Abundance ◽  
Interannual Variations ◽  
Jack Mackerel ◽  
The East China Sea ◽  
Trachurus Japonicus ◽  
China Sea ◽  
Japanese Jack Mackerel

Abstract We examined the interannual variations in distribution and abundance of Japanese jack mackerel Trachurus japonicus larvae <5 mm standard length (SL), based on sampling surveys over a broad area of the shelf break region of the East China Sea (ECS) during late winter and spring for 12 years from 2001 to 2012. Larval abundances in late winter were higher than those in spring. In late winter, ratios (expressed as %) of larval abundance in the southern ECS south of 28°N to the whole study area were highest during the study period, with values ranging from 80.0 to 95.8%. In spring, the ratios in the southern ECS were still high (34.3–88.8%), although the values increased slightly in the northern and central ECS. There was no significant interannual variation in the centre of distribution of the larvae, suggesting that the formation of spawning grounds would be related to topographic rather than hydrographic conditions. Habitat temperature of larvae in the central and southern ECS was ∼3–5°C higher than that in the northern ECS throughout the study period, indicating that larval growth and survival processes may differ between the two areas. In the southern ECS, larval abundances fluctuated largely from year-to-year, and the interannual variations were closely correlated with water temperature and chlorophyll a concentration. However, larval abundance did not correlate with an index of recruited juveniles (∼50–75 mm SL) in the ECS, suggesting that mortality during the late larval and early juvenile stages is responsible for recruitment success or failure.

Transport and survival processes of eggs and larvae of jack mackerel Trachurus japonicus in the East China Sea

2008 ◽  
Vol 74 (1) ◽  
pp. 8-18 ◽  
Author(s):  
Akihide KASAI ◽  
Kousei KOMATSU ◽  
Chiyuki SASSA ◽  
Yoshinobu KONISHI
Keyword(s):  
East China Sea ◽  
East China ◽  
Jack Mackerel ◽  
The East China Sea ◽  
Trachurus Japonicus ◽  
China Sea ◽  
Eggs And Larvae
Sign in / Sign up

Export Citation Format

Share Document