Question

Fish are generally considered a more feed-efficient source of animal protein compared with many land-based livestock, in terms of the amount of feed needed per unit of body weight gain, mainly because:

Q: Answer-Fish are generally considered a more feed-efficient source of animal protein compared with many land...

Because fish are poikilothermic cold-blooded and are also buoyed by water, they do not need to expend energy maintaining a constant body temperature or fully supporting their body weight against gravity, allowing them to convert a larger proportion of consumed feed directly into body growth compared with warm-blooded land livestock.