amago salmon
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2016 ◽  
Vol 73 (3) ◽  
pp. 461-468 ◽  
Author(s):  
Jun-ichi Tsuboi ◽  
Kentaro Morita ◽  
Thomas Klefoth ◽  
Shinsuke Endou ◽  
Robert Arlinghaus

Positively size-selective vulnerability to fishing is well established in recreational fisheries. Size-selective harvesting can either induce an indirect selection response of behavioural traits that are correlated with size or exert direct selection pressures on behaviours that contribute to vulnerability. In addition, learning to avoid future capture may always happen. Behavioural change caused by fishing may in turn affect the size-selective properties of angling. To test this prediction, field experiments with amago salmon (Oncorhynchus masou ishikawae) were conducted. We demonstrated that, as expected, large fish were more vulnerable than smaller individuals in a low fishing pressure (LP) stream and that positively size-selective angling was not (or no longer) present in a high fishing pressure (HP) stream. Moreover, fish in the HP stream were by far less vulnerable to angling with natural bait than fishes in the LP stream. Laboratory studies showed that offspring from HP streams were intrinsically shyer than offspring collected from LP streams. We propose that the increased timidity of individuals inhibiting HP streams disrupted the generally positive relationship among salmon body size and its vulnerability to angling. Fisheries-induced timidity in response to high exploitation rates reduces catchability, affects the size-selective properties of angling, reduces the value of fishery-dependent stock assessments, and potentially affects trophic interactions.


2015 ◽  
Vol 82 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Tomonori Kuwada ◽  
Tetsuya Tokuhara ◽  
Munetaka Shimizu ◽  
Goro Yoshizaki

Aquaculture ◽  
2015 ◽  
Vol 435 ◽  
pp. 377-380
Author(s):  
Manabu Sugiyama ◽  
Fumio Takenaga ◽  
Hiroyuki Okamoto ◽  
Tetsuji Masaoka ◽  
Kazuo Araki ◽  
...  

2014 ◽  
Vol 81 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Takeshi Yamamoto ◽  
Koji Murashita ◽  
Hiroyuki Matsunari ◽  
Hiromi Oku ◽  
Hirofumi Furuita ◽  
...  

2014 ◽  
Vol 80 (3) ◽  
pp. 569-579 ◽  
Author(s):  
Takeshi Yamamoto ◽  
Hiroyuki Okamoto ◽  
Hirofumi Furuita ◽  
Koji Murashita ◽  
Hiroyuki Matsunari ◽  
...  

2014 ◽  
Vol 80 (2) ◽  
pp. 233-240 ◽  
Author(s):  
HISAE MIYAHARA ◽  
HIDEYUKI YAMADA ◽  
TAKUYA SATO ◽  
YASUSHI HARADA ◽  
KOUICHI KAWAMURA

Biology Open ◽  
2012 ◽  
Vol 1 (10) ◽  
pp. 1035-1042 ◽  
Author(s):  
Manabu Sugiyama ◽  
Fumio Takenaga ◽  
Yoichiro Kitani ◽  
Goshi Yamamoto ◽  
Hiroyuki Okamoto ◽  
...  

2012 ◽  
Vol 13 (5) ◽  
pp. 1343-1353 ◽  
Author(s):  
Hisae Miyahara ◽  
Hideyuki Yamada ◽  
Takuya Sato ◽  
Yasushi Harada ◽  
Shoichiro Yamamoto ◽  
...  

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