309
H.-J. Ceccaldi et al. (eds.), Marine Productivity: Perturbations and Resilience of Socio-ecosystems,
DOI 10.1007/978-3-319-13878-7_34, © Springer International Publishing Switzerland 2015
New Monitoring Method to Assess
the Marine Algae Distribution
and Fish School in Marine
Ecosystems: The Hachiri-ga-se Hill
(Off Mishima, Hagi, Japan)
Case Study
Akira Hamano , Hideaki Tanoue , Takahito Fujiwara ,
and Teruhisa Komatsu
Abstract
The importance of seamounts (<1,000 m height) outside the continental
shelf as hot spots for marine ecosystems (from primary producers such as
phytoplankton to top predators like tuna) is currently being globally discussed. On the other hand, as sea- hills (>500 m height) situated on the
continental shelves are smaller than seamounts, even though they contribute signifi cantly to coastal ecosystems by enhancing the supply of prey
and providing resting grounds for numerous fi sh populations, they have
not been fully recognized. Therefore, lately, the importance of sea-hills as
a spawning and nursery ground and migration area for marine resources
has been pointed out.
The Hachiri-ga-se hill off Mishima, Japan, is located in a part of the
100 m isobath in the southwestern part of the continental shelf and is an
important spawning and nursery ground and supports coastal fi sheries
such as pole and lines. However, there have been fears about the devastation of the fi shing ground due to unplanned fi shing activities and change in
marine environments.
A. Hamano
Department of Fisheries Science and Technology ,
National Fisheries University ,
Shinomoseki, 2-7-1 , Nagata-Honmachi
759-6595 , Japan
e-mail: ahamano@fi sh-u.ac.jp
H. Tanoue
Department of Fisheries Science and Technology ,
National Fisheries University ,
Shinomoseki, 2-7-1 , Nagata-Honmachi
759-6595 , Japan
Aix-Marseille University, Mediterranean Institute
of Oceanography (MIO) , Université du Sud
Toulon-Var, CNRS/INSU, IRD, UM 110 ,
Campus universitaire de Luminy, case 901 ,
13288 Marseille cedex 09 , France
T. Fujiwara
National Fisheries University , Shinomoseki, 2-7-1 ,
Nagata-Honmachi 759-6595 , Japan
T. Komatsu
Atmosphere and Ocean Research Institute (AORI) ,
University of Tokyo, President of S.F.J.O. (*) of
Japan , 5-1-5, Kashiwanoha , 277-8564
Kashiwa-shi , Japan
H.-J. Ceccaldi et al. (eds.), Marine Productivity: Perturbations and Resilience of Socio-ecosystems,
DOI 10.1007/978-3-319-13878-7_34, © Springer International Publishing Switzerland 2015
New Monitoring Method to Assess
the Marine Algae Distribution
and Fish School in Marine
Ecosystems: The Hachiri-ga-se Hill
(Off Mishima, Hagi, Japan)
Case Study
Akira Hamano , Hideaki Tanoue , Takahito Fujiwara ,
and Teruhisa Komatsu
Abstract
The importance of seamounts (<1,000 m height) outside the continental
shelf as hot spots for marine ecosystems (from primary producers such as
phytoplankton to top predators like tuna) is currently being globally discussed. On the other hand, as sea- hills (>500 m height) situated on the
continental shelves are smaller than seamounts, even though they contribute signifi cantly to coastal ecosystems by enhancing the supply of prey
and providing resting grounds for numerous fi sh populations, they have
not been fully recognized. Therefore, lately, the importance of sea-hills as
a spawning and nursery ground and migration area for marine resources
has been pointed out.
The Hachiri-ga-se hill off Mishima, Japan, is located in a part of the
100 m isobath in the southwestern part of the continental shelf and is an
important spawning and nursery ground and supports coastal fi sheries
such as pole and lines. However, there have been fears about the devastation of the fi shing ground due to unplanned fi shing activities and change in
marine environments.
A. Hamano
Department of Fisheries Science and Technology ,
National Fisheries University ,
Shinomoseki, 2-7-1 , Nagata-Honmachi
759-6595 , Japan
e-mail: ahamano@fi sh-u.ac.jp
H. Tanoue
Department of Fisheries Science and Technology ,
National Fisheries University ,
Shinomoseki, 2-7-1 , Nagata-Honmachi
759-6595 , Japan
Aix-Marseille University, Mediterranean Institute
of Oceanography (MIO) , Université du Sud
Toulon-Var, CNRS/INSU, IRD, UM 110 ,
Campus universitaire de Luminy, case 901 ,
13288 Marseille cedex 09 , France
T. Fujiwara
National Fisheries University , Shinomoseki, 2-7-1 ,
Nagata-Honmachi 759-6595 , Japan
T. Komatsu
Atmosphere and Ocean Research Institute (AORI) ,
University of Tokyo, President of S.F.J.O. (*) of
Japan , 5-1-5, Kashiwanoha , 277-8564
Kashiwa-shi , Japan