Indian Journal of Animal Research

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Research Article

Indian Journal of Animal Research, volume 50 issue 6 (december 2016) : 1018-1022

Changes in lysozyme concentrations over time in cultures of southern Bluefin Tuna, Thunnus maccoyii

Jinhui Sun1, Lin Ma2, Jinghui Li1, Dongqing Bai1, Zhenyan Cheng1, Xiuting Qiao1*
1<p>Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries,&nbsp;Tianjin Agricultural University, Tianjin 300384, P.R. China.</p>
Cite article:- Sun1 Jinhui, Ma2 Lin, Li1 Jinghui, Bai1 Dongqing, Cheng1 Zhenyan, Qiao1* Xiuting (2016). Changes in lysozyme concentrations over time in cultures ofsouthern Bluefin Tuna, Thunnus maccoyii . Indian Journal of Animal Research. 50(6): 1018-1022. doi: 10.18805/ijar.v0iOF.4564.

ABSTRACT

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.

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