Smolt to adult return rates (SAR), otherwise known as marine survival, for three different Maine Rivers utilizing three different stocking strategies, are displayed above. This is the estimated number of adults returning to each river divided by the estimated number of smolt that left the system two years prior. 2019’s data point with the Peter Gray Parr Project is tied to the 2017 smolt year class and is conservatively calculated using the 60 redds observed. The estimated number of adults should end up being higher than the number of redds counted.
The number of East Machias redds (60) counted in 2019 is the highest observed looking all the way back to 1991 and 6 times the average of the past two decades. The average SAR for the Peter Gray Parr Project (PGPP) is conservatively at 2.445% with an SAR this year of at least 3.5%. This is almost triple the SAR seen on the Narraguagus River and Sheepscot River from naturally reared (fry stocked, natural spawning, and egg planting) and limited parr stocking. The PGPP’s average SAR is over 30 times more than the Penobscot River’s during the same time frame. To be concise, per capita, the Peter Gray Parr Project method returns more adult salmon than other stocking strategies being used in Maine.
An in-depth Peter Gray Parr Project summary can be found here: Parr Project Summary 2012 – Present