Flow field control in marine fish larviculture tanks: lessons from groupers and bluefin tuna in Japan

Effect of tank shape on survival and growth of Pacific bluefin tuna Thunnus orientalis larvae

“…Unfavorable flow in rearing tanks can cause mass mortality of marine fish larvae (Sakakura et al, 2019;Shiotani et al, 2003;Yamaoka et al, 2000;Backhurst and Harker, 1988). Flow field structures in tanks differ by tank size and shape (Sakakura et al, 2019;Moore and Prange, 1994).…”

“…Unfavorable flow in rearing tanks can cause mass mortality of marine fish larvae (Sakakura et al, 2019;Shiotani et al, 2003;Yamaoka et al, 2000;Backhurst and Harker, 1988). Flow field structures in tanks differ by tank size and shape (Sakakura et al, 2019;Moore and Prange, 1994). CTs have an axisymmetrical flow field pattern (Sumida et al, 2013), and the flow field provides a uniform current environment and facilitates the elimination of biosolids from the tank bottom (Masalό and Oca, 2016;Oca and Masalό, 2013;Timmons et al, 1998).…”

“…Thus, the low-flow areas in RTs may be larger at the bottom than in CTs, leading to the sinking syndrome of PBT larvae because low velocities and poor mixing of water in rectangular tanks lead to the creation of stagnate areas, causing the accumulation of biosolids on the tank bottom (Oca and Masalò, 2007). These low-flow areas may have negative effects on larviculture (Sakakura et al, 2019).…”