“If people kept dogs in these conditions,they'd be put in prison,” said the author,Ronald Oldfield.“In larger tanks,the fish were not in continuous eyesight of each other.They were swimming around,checking everything out rather than beating each other,” he added.“It's something we should think about.”
The study consisted of two experiments.In one,Dr.Oldfield tested the effects of overcrowding by keeping tank size constant (不变) while increasing the number of fish.In the other,he tested environment by placing three fish in tanks of different sizes.He then recorded their behavior at least two hours after feeding,to eliminate (排除)competitive behaviors related to food.While aggression seemed to remain constant regardless of the number of fish in a tank,it dropped off considerably once the fish were placed in a 100gallon tank with several plants and rocks to form shelters.
The findings confirmed what he found when observing Midas in the wild.“If you go out and observe these fish swimming in a river,” he said,“they're not aggressive at all,really.” This conclusion is not news to Justin Muir,the owner of a fish tank business.“More volume of water is always better.It keeps the fish healthier,and the tank is more stable.”
【语篇解读】 本文叙述了热带鱼的生活习性。当它们的生活空间越小时,它们的侵略性就越强;反之,如果生活空间越大,侵略性越小。
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