Buoyancy control and diel changes in swim-bladder volume in cultured striped trumpeter (Latris lineata) larvae
Buoyancy control and diel changes in swim-bladder volume in cultured striped trumpeter (Latris lineata) larvae
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养殖条纹喇叭鱼 (Latris lineata) 幼虫的浮力控制和鳔体积的昼夜变化
DOI：
10.1071/mf04209
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发表时间：
2005
影响因子：
1.8
通讯作者：
P. Pankhurst
中科院分区：
文献类型：
--
作者：
A. Trotter;S. Battaglene;P. Pankhurst
本文研究了人工养殖的条纹喇叭鱼仔鱼的密度、鱼鳔容积、浮力和摄食与生长、光周期和光照强度的关系。在最初的鱼鳔充气之前，在亮相和暗相的身体密度都是负的，在昼夜循环中从1.0275到1.0290 g cm−3（海水：1.0265 g cm−3）进行调节。在初始的鱼鳔膨胀后，随着鱼鳔体积在一个昼夜循环中的增加，在黑暗阶段，身体密度显著下降。向下浮力从干物质随着年龄的增加，并通过增加相对鱼鳔体积补偿。在光（1.0260 g cm−3）和暗（1.0245 g cm−3）阶段之间的体密度差异最大的是当幼虫从6.5到7.5 mm（标准长度）时（海水：1.0260 g cm−3）。无功能性鱼鳔的仔鱼密度始终大于有功能性鱼鳔的仔鱼，且前者生长缓慢。昼夜浮力控制条纹喇叭虫幼虫与低幅度的变化，在游泳膀胱体积是类似的其他瞬态physostomes。先前观察到的死亡事件在条纹号鸟文化可能与负浮力第一次喂养和正浮力在黑暗阶段后，最初的鱼鳔膨胀。
Body density, swim-bladder volume, buoyant force and feeding in relation to growth, photoperiod and light intensity were investigated in cultured striped trumpeter larvae. Prior to initial swim-bladder inflation, body density was negative during both the light and dark phases, regulated on a diel cycle from 1.0275 to 1.0290 g cm−3 (seawater: 1.0265 g cm−3). After initial swim-bladder inflation, body density decreased markedly during the dark phase as swim-bladder volume increased on a diel cycle. Downward buoyant force from dry matter increased with age and was compensated for by increasing relative swim-bladder volume. Greatest difference in body density between light (1.0260 g cm−3) and dark phase (1.0245 g cm−3) was when larvae were from 6.5 to 7.5 mm (standard length) (seawater: 1.0260 g cm−3). Density of larvae without a functional swim bladder was always greater than larvae with a functional swim bladder, and the former had reduced growth. Diel buoyancy control exhibited by striped trumpeter larvae with low amplitude changes in swim-bladder volume is similar to other transient physostomes. Mortality events previously observed in striped trumpeter culture are possibly related to negative buoyancy before first feeding and positive buoyancy during the dark phase following initial swim-bladder inflation.