School of fish in Jockey Cove

[coley]

I was speaking the other evening with people I rent from for the last 20 or so years who have a place in Jockey Cove near Wolfeboro Bay. They said they were up last weekend and off the end of their dock, they observed very large schools of fish swimming back and forth multiple times in relatively shallow water. They thought they might have been bass (due to some striping), but didnt think bass swam together in such large numbers. They have been going there since 1963 and have never seen this. Any thoughts as to what this might have been??