Fisheries Engineering

[title in Japanese]

Hiroya SANO

1994 Volume 31 Issue 2 Pages 71-78
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_71

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An Evaluation of Inhabitable Condition for Haliotis (Nordotis) discus hannai by the Environmental Analysis Logic Method, and a Proposal to Improve the Unsuitable Conditions

Yoichiro IWASE, Yutaka IKEDA, Masakazu OKI, Yasunobu TSUBOTA, Makoto N ...

1994 Volume 31 Issue 2 Pages 79-86
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_79

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The Environmental Analysis Logic Method was used to evaluate the inhabitable condition for Haliotis (Nordotis) disctts hamai at the longshore area in the north part of Miyagi prefecture, Japan. The suitable conditions were as follows. There is no Dilophus okamurai, and the area is offshore, and the distance from a sandy bed is more than 10 m, and the stone on a bed is not mobile. The unsuitable conditions were as follows. There is Dilophus okamurai or the area is inshore, or a sandy bed exists, or the distance from it is less than 10 m. In order to improve the unsuitable conditions in some areas, the techniques were proposed such as immobilization of sand or small stone, the removal of Dilophus okamurai, and planting their favorite seaweeds. It was also indicated that the Environmental Analysis Logic Method was more useful than the multi variate analysis in that the bioIogical and physical information was taken into account for the evaluation.

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Mechanism of Water Mixing Due to Intemal Wave in a Stratified Bay and Its Modeling

Haruyasu KIMURA, Shouyu ZHANG, Michikazu BAN

1994 Volume 31 Issue 2 Pages 87-91
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_87

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The intemal wave is induced in a stratified bay with shallow mouth by tidal waves. If the intemal wave is considerably amplified, the vertical mixing processes such as the wave breaking on bottom slope, the eddy diffusion due to intemal shear flow and the sucking out of bottom water to the extemal sea are occurred. In the present study, hydraulic experiments on intemal wave excitation by a steady surface tide in a simple bay model were carried out. The generation of intemal waves and the miximg among the lower layer water, the upper layer water and the extemal water are measured in detail. Modeling the mechanism of the phenomean, three layer box model is applied.

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On-Site Test for Durability of Steel Fｌoating Fish Reef with Float and Mooring

Yuji IIDA, Eiichi TORIHARA, Tadayasu MIDORIKAWAA, terufumi TAKEUCHI, K ...

1994 Volume 31 Issue 2 Pages 93-101
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_93

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Importance of Physical Disturbance for Artificial Development of Nearshore Rocky Fishing Grounds

Shigeru KAWAMATA

1994 Volume 31 Issue 2 Pages 103-110
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_103

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Prospects for Research on Development of a New Model of Resource Management

Yoshiharu NAKAMURA, Satoru TAGUCHI

1994 Volume 31 Issue 2 Pages 111-119
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_111

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Fishery Management of Marine Ranching in the Oita Prefectural Sea Area

Katsuhiro KUDO, Hideaki KIMOTO

1994 Volume 31 Issue 2 Pages 121-126
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_121

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Five marine ranches which have acoustic sound for red sea bream have been made in the Oita prefectural sea area since 1986. The four of them are located in the northern part of the Bungo-suido, Usuki and Tsukumi bay. In this report, We have tried to simulate future management for them with emphasis on the economic effects, using twelve types of management factors, in term of seed liberation, size regulation, fishing days and their combinations. As a result of this, the net profits for natural and liberated fish in regards to the three types of management factors were connected mostly with size regulation. The seed liberation factor does not provide enough profit in itself. To provide economic gains size regulation should be added as a management factor. And, in order to achieve the manegement aim, a period of five years is necessary after the management system is started.

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Resource Management of Japanese Littleneck Tapes phillipinarum on Propagation Grounds in Notsuke Bay of Eastern Hokkaido

Yoshihiko NAKAGAWA

1994 Volume 31 Issue 2 Pages 127-132
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_127

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Report of the Spring Symposium '94 on the Possibility of Construction of Production System about Reclaimed Fishing Grounds

Symposium Executive Committee

1994 Volume 31 Issue 2 Pages 133-143
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_133

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[title in Japanese]

Secretariat

1994 Volume 31 Issue 2 Pages 144-156
Published: 1994
Released on J-STAGE: January 01, 2018

DOIhttps://doi.org/10.18903/fisheng.31.2_144

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