They release millions of eggs and sperm within a period of 20 minutes , ensuring that some young will survive parrotfish and other predators , researchers report this week in the journal of experimental biology .
为了确保他们的幼仔在隆头鱼和其他天敌中活下来，每20分钟内，他们会产出数以万计的卵子和精子。
At first I think his picture is nothing more than a huge scribble of red crayon , but when I lean in to take a closer look I see that on the bottom of the page william has drawn a rainbow-colored parrotfish .
