秦建光:解锁“刺身之王”——蓝鳍金枪鱼的人工繁育密码
“生物育种,引领未来”,秦建鳍金枪鱼11月24日,光解工繁2023水产种业高质量发展论坛在广州举行。锁蓝该论坛是育密2023中国水产种业博览会暨首届广东(国际)现代化海洋牧场产业大会同期论坛。
南方蓝鳍金枪鱼凭借其多层次的刺身之王美味口感,是秦建鳍金枪鱼世界公认的“刺身之王”。2009年,光解工繁用鱼缸养殖的锁蓝金枪鱼被《时代周刊》评为全球50大最佳发明之一。本次论坛就邀请到了解决这一世界级难题的育密国际顶级教授——澳大利亚菲林德斯大学教授秦建光讲述关于南方蓝鳍金枪鱼的繁殖和孵化管理。
一笼超100万美元金枪鱼的诞生
解析人工养殖的细节
南方蓝鳍金枪鱼(Thunnus maccoyii),鲭鱼科。秦建鳍金枪鱼从形态上看,光解工繁它就像一支雪茄。锁蓝鱼身中部很大,育密鱼的尾巴非常尖。鱼的顶部是深色或者蓝色的,鱼的底部是白色或灰色的。这种鱼可以长到 200 公斤,长度超过2米。它们主要分布于赤道南部,也因此得名。在南澳大利亚的林肯港,正是农业养殖南方蓝鳍金枪鱼的地方。
从人工养殖的笼子大小、网眼直径、深度、金枪鱼网线放养密度到金枪鱼的食物转化率、金枪鱼收获的时节,秦建光细致讲述了蓝鳍金枪鱼的养殖。
产卵——孵化——饲养
探索金枪鱼繁育的关键
如何促使金枪鱼产卵呢?选择达到性成熟的个体是关键。金枪鱼的繁殖并不能在海洋中的网箱里进行。由于金枪鱼卵无法保存,需要由直升机把鱼从笼子里运到产卵孵化场。
秦建光介绍,根据他记载的实验期间记录,在2010年,金枪鱼的总产量接近1500万,可孵化卵为2690万,即约2700万条金枪鱼。鱼卵孵化的全过程十分迅速,在24小时即可完成,鱼卵迅速发育成小鱼,然后形成卵黄囊。在这期间,鱼仍处于胚胎阶段,之后卵黄囊被释放。在孵化之后,观察鱼的形态是一项至关重要的任务。当观察到鱼的嘴部是张开的,表明它已经准备好接受幼虫喂食。
据资料显示,西班牙海洋学研究所曾经进行陆基设施内的蓝鳍金枪鱼人工繁殖研究,研究者利用两群分别孵化于2017和2018年的蓝鳍金枪鱼进行交配。在植入了诱导最终成熟和产卵的激素后,过48小时,获得了数十万个受精卵,72小时后,近300万个受精卵在接下来的几天里继续产卵。
见证历史
鱼缸养殖金枪鱼化不可能为可能
一缸南部蓝鳍金枪鱼开始产卵,它们连续产卵超过一个月。2009年3月12日,澳大利亚林肯港见证了这历史性的一刻。
南方蓝鳍金枪鱼的特点之一是持续的高频率游泳,因为它们在海洋中不受边界限制。然而,在鱼缸里,这些鱼还没有意识到边界的存在,因此它们感觉没有边界和鱼缸的限制。如果这些鱼持续游到鱼缸边缘,可能会发生意外。
在幼鱼饲养的14天后,幼鱼大量死亡。这是因为,高频率游泳的特性会使能够游泳的幼鱼不断撞向水箱壁,最终导致自杀。但是,剩下的鱼生长速度很快。19天后,鱼的体重已经达到了250克,可以准备放入笼中养殖了。这一成功案例已经得到了国际认可,也被《时代周刊》评为2009年全球50大最佳发明之一。
【记者】李瑞雪
【来源】南方农村报
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