清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。
Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.
有些热带鱼类产卵繁殖。
Some tropical fish reproduce themselves [their kind by laying eggs].
发现鱼卵及仔鱼共43个种，并且珠江口区域全年都有鱼类产卵。
Eggs and larvae found a total of 43 kinds, and the Pearl River estuary region are fish spawning year.
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