The Bible recounts two stories in which fishermen, helped by Jesus, hauled in enormous catches that fed their communities for weeks. These events likely took place on the Sea of Galilee, also known as Lake Kinneret, where Jesus preached.
A new study reveals those miracles can be explained by a seasonal natural phenomenon.
What Did the Scientists Discover?
Researchers from the Kinneret Limnological Laboratory in Israel found that oxygen levels near the bottom of the lake fall dramatically. Blooms of phytoplankton consume oxygen and prevent it from reaching deeper water, so fish suffocate. The Daily Mail reported that the team pointed to two events in 2012 when thousands of dead fish washed up along the shore.
“Our research may explain why large numbers of fish appeared near the shore, as described in the Bible,” the team wrote. The team suggested their findings support the idea that Jesus’ stories about colossal catches could have been based on real events.
Satellite image of the Sea of Galilee
How Was the Research Conducted?
The researchers set out to find how fishermen could have made such huge catches. They deployed sensors to measure water temperature and wind direction and speed. The data showed that strong westerly winds help mix the water and trigger low oxygen levels at depth.
Yael Amitai, a co-author of the study, explained, “The Sea of Galilee is a stratified lake. The upper layer is warm and oxygen-rich, while the lower layer is cold and oxygen-poor.”
Lake Kinneret is a warm lake, with surface temperatures that rarely drop below 3.9 °C. The lake develops layers of different temperatures because of density differences. Twice a year it experiences a mixing event when the upper and lower layers exchange water, which redistributes oxygen.
During a 4–6 week period in March and April, the lake’s layers can create anoxic conditions at depth, meaning the water lacks oxygen and cannot support most aquatic life.
In 2012 this phenomenon mainly affected carp that feed on zooplankton, which make up a large share of the lake’s population. Other dead fish were also found, including catfish, tilapia, and mullet.
This sort of event isn’t uncommon; it happens in lakes around the world. The team suggested that conditions in the lake 2,000 years ago were similar to those today. At the time of the biblical stories, the region was densely populated by farmers, with an estimated population of about 200,000—similar to today’s numbers.
