Haddock (Melanogrammus aeglefinus) are present on both sides of the North Atlantic. Their distribution in the Northwest Atlantic ranges from Greenland to North Carolina. They are an important food resource that needs to be closely monitored to ensure a sustainable fishery. Research studies have reported that both male and female haddock produce sounds during courtship and spawning. These sounds can be used to monitor spawning activities non-intrusively and at large scale. The objective of this paper is to analyse the spatial and temporal occurrence of Haddock sounds in the Gulf of Maine. Passive acoustic data were collected in 2003, 2004, 2006, and 2007 in areas known to contain spawning haddock. To analyze the large amount of data collected, an automated haddock sound detector was developed based on a measure of kurtosis and the Dynamic Time Warping algorithm. The detector was trained using the 2006 and 2007 data and its performance was quantified and optimized by comparing detection results with manually annotated Haddock sounds. The detector was then used to analyze data collected in 2003 and 2004. Results provide information on the temporal and spatial distributions of courtship and spawning sounds.