Integration of biology and fluid dynamics for marine fish larviculture in small scale tanks

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22338
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
• Research Institution: Nagasaki University
• Principal Investigator: Sakakura Yoshitaka 長崎大学, 水産・環境科学総合研究科(水産), 教授 (20325682)
• Co-Investigator(Kenkyū-buntansha): 山崎 渉 長岡技術科学大学, 工学研究科, 准教授 (50598696) ; 角田 哲也 大島商船高等専門学校, 商船学科, 教授 (00163056)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 種苗生産 / 海産魚 / 仔魚 / 小型水槽 / 流場 / 流体力学

Outline of Final Research Achievements

We evaluated the condition for larviculture in small scale tanks integrating bioscience and fluid dynamics. For 50-L volume, one aerator should be set at the center of the bottom with flow rate at 100 mL/min. Cylindrical but not rectangular tank is recommended for the species such as bluefin tuna in which sinking syndrome occurs during larviculture. For less than 10-L volume, plankton Kreisel tank is recommended at 15-150 mL/min aeration rate. However, in both tanks, we observed the trend of failure in swimbladder inflation of larvae. Future consideration is that seeking the timing and condition enhancing the air gulping behavior of larvae.

Free Research Field

水産増養殖

Academic Significance and Societal Importance of the Research Achievements

海産魚類の種苗生産の効率を上げて高度化するためには，繰り返しを設けた統計学的実験計画に基づく仔魚飼育実験が必要で，数リットルから数十リットルの小型水槽での仔魚飼育を実現しなければならない。本研究によって50Lであれば汎用水槽でも，またさらに小規模でも特殊な形状の小型水槽で海産仔魚飼育を実現することができたことから，その意義は大きいと考える。