Nattiqsujuq is an important area for undefined aggregations of one shark species.

High catches of Greenland Sharks in Nattiqsujuq during research sampling conducted in September 2011, 2012, and 2013 highlight the high abundance of sharks in this small area. Eight longline sets were completed over three years and caught 52 Greenland Sharks (100–312 cm total length [TL]) (Hussey et al. 2015). Longlines (ranging in length from 368 to 735 m) were set in the same approximate location within Scott Inlet Fjord at depths between 668 and 800 m and soaked for ~10–12 hours. In 2011, eight individuals were caught in one set and in 2012, 17 individuals in two sets. In 2013, another 27 sharks were captured in five days of sampling, highlighting the high number of sharks in this inlet during this season.

Between 2013–2016, 65 Greenland Sharks were tagged with acoustic transmitters in the area (93–350 cm TL) (Edwards et al. 2021). Over the multi-year monitoring period, sharks were present in the area on a defined seasonal basis with the earliest recorded entry on 21^st July and the latest departure on 22^nd November, and with the overall presence in this inshore system strongly associated with the ice-free season (i.e., boreal summer/fall). Importantly, the receivers remained deployed throughout the winter period, but no sharks were detected, even though Greenland Sharks have been captured by fishers in coastal waters offshore Nattiqsujuq during the ice-covered period (Walsh 2008). The seasonal aggregation of Greenland Sharks in this specific fjord being tied to ice cover is supported by the median date of entry into Nattiqsujuq at one specific gate by 8^th August and median date of exit on 5^th October. The majority of tagged sharks exited (n = 89 events) and entered (n = 24) Nattiqsujuq via this closely spaced receiver gate dividing Nattiqsujuq from offshore Baffin Bay. High numbers of individual sharks (relative to those tagged per year) were detected on this gate, including 23 individuals in 2014 (100% of tagged individuals in 2014). In total, 24.6% of the tagged sharks (16 of 65) returned in subsequent years (up to three years post release). These return data and remaining period in the area (up to 99 days) provide evidence of a seasonal aggregations of individuals within this area. The 95% extent of activity space for all Greenland Sharks across all years of study was focused on the inner channel and on the gate at the mouth of Nattiqsujuq.

Between 2012–2018, 193 Greenland Sharks, including those detailed above, were tagged with acoustic transmitters at seven inshore sites along the east coast of Baffin Island (Edwards et al. 2022). Of the 155 detected sharks, 81 were detected at this area.

In September 2016, one baited remote underwater video station (BRUVS) was deployed within the area, at 620 m depth and another one at the exit channel to Baffin Bay at ~800 m. Individuals were identified from the video footage using unique scar and colouration patterns and other physical characteristics. Six sharks were recorded in this area (9.15 hours total recording time) and two sharks offshore the inlet (9.5 hours) (mean size, 198.3 ± 73.8 cm TL) (Devine et al. 2018).

Combined, these studies provide evidence for the seasonal aggregation of Greenland Sharks at Nattiqsujuq during the ice-free period (July–November). It is possible these juvenile/sub-adult animals are aggregating in this system during the ice-free period to feed as potential prey such as Greenland Halibut and Narwhal also move offshore as sea ice forms (McMeans et al. 2015; Marcoux et al. 2016; Barkley et al. 2018). More information is required to determine the nature and function of this aggregation.