Global fish stocks if measured by the abundance of fish availability, are primarily healthy. There is plenty of fish for people to harvest, but in the role of ecosystems, things are not so healthy. Fish are over-harvested to unsustainable levels, which directly affects the health and stability of our oceans. At the rising rate we are harvesting fish, we are overusing marine resources. There is a cap to what we can gain from the sea, and with the production rate we are going right now, we could be closer to the limit then we think. That is why I put the health of global fish stocks at 6, with the understanding that it can become better or worse.
Over-harvesting is a good point. I witnessed this firsthand over the summer when I learned about how well the commercial fishermen in our town were doing. They really struggled and didn’t quite get the amount of fish they wanted, most likely due to over-fishing in previous years.