光唇鱼对单色光偏好的性别差异及相关生理机制

来源 :中国水产科学 | 被引量 : 0次 | 上传用户:X5203344
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为探究溪流性鱼类光唇鱼(Acrossocheilus faseiatus)对光色的偏好是否存在性别差异,以及芳香化酶作为催化睾酮(T)向雌二醇(estradiol,E2)转化的限速酶在行为调节中的关键角色,本研究采用行为学方法研究了雌鱼和雄鱼对6种单色LED光源的选择偏好,并尝试利用药物抑制体内芳香化酶活力从而改变血浆性激素水平和鱼的行为表现.结果 表明,雌鱼和雄鱼分别相对偏好红光(峰值为637 nm)和黄光(590 nm),两者均相对排斥蓝光(465 nm)、紫光(405 nm)以及含有蓝光波段的白光(447 nm),而对绿光(518 nm)的偏好不明显.摄食含有芳香化酶抑制剂来曲唑(letrozole,LZ)的实验饲料10 d后,雌性和雄性光唇鱼脑和性腺组织内芳香化酶活力和血浆E2水平均显著下降,但血浆T水平无显著变化.值得注意的是,LZ也导致处理鱼对光色选择偏好的改变,雌鱼转为相对偏好蓝光,雄鱼转为相对偏好红光.然而,摄入含LZ+E2实验饲料后除芳香化酶活力降低外,T、E2两种性激素水平和光色偏好行为表现均未出现明显变化.因此推测光唇鱼对光色偏好的性别差异极可能与体内芳香化酶活力和雌二醇水平的性别差异有关,而与睾酮水平无明显关联.
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