1Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, P.R. China
2Tianjin Fishery Research Institute, Tianjin, 300221, PR China
Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, P.R. China
*Corresponding author's e-mail: qxt65@sohu.com
Online published on 19 December, 2016.
An 8-week trial in ranching cages was conducted to determine lysozyme concentration changes, and to examine the relationship between fish condition index, fish sizes, and fish lysozyme concentrations in southern bluefin tuna (SBT). Frozen pilchard were prepared for SBT each day during the ranching trial period. The results showed that lysozyme concentrations significantly increased in southern bluefin tuna over time in the culture. The lysozyme concentrations increased continuously from week 0 to week 8, from 26.09±13.46 to 215.91±62.11 μg/ml, representing an almost 800% increase. During the 8 weeks, the number of Cardicola forsteri and Caligus spp increased from 0 to 9.2±5.45 and 1. 1±1.6, respectively. As C. forsteri or Caligus spp increased, lysozyme concentrations increased. In addition, the lysozyme concentration increased with increases in weight, length, and condition index. This study aimed to provide a theoretical basis for artificial SBT health cultures.
Caligus spp, Cardicola forsteri, Condition factor, Fish size, Lysozyme concentration, Southern Bluefin Tuna
