Ontogeny of swim bladder inflation and caudal fin aspect ratio with reference to vertical distribution in Pacific bluefin tuna Thunnus orientalis larvae

Diel changes in the vertical distribution of larval cutlassfish Trichiurus japonicus

“…It is different from other species. For example, the swim bladder begins to inflate from the larvae after yolk-sac absorption in Pacific bluefin tuna Thunnus orientalis (Ina et al ., 2014). The yolk-sac larvae of Pacific bluefin tuna use yolk-sac and oil globule to acquire buoyancy.…”

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

“…Sinking syndrome of PBT larvae occurs because larvae with higher body density than seawater sink to the bottom of the tank during dark periods due to low swimming activity (Tanaka et al, 2009;Takashi et al, 2006). Swimbladder inflation failure is one of the causes of sinking syndrome (Kurata et al, 2017(Kurata et al, , 2015(Kurata et al, , 2012Ina et al, 2014;, as the swimbladder controls the buoyancy of fish by reducing body density relative to that of surrounding water (Taylor et al, 2010;Phleger, 1998). However, Takashi et al (2006) found that the body density of PBT larvae was higher than seawater density during dark periods even in swimbladder-inflated larvae.…”