Marine Life Around Franz Josef Land

Franz Josef Land (Russian: Земля Франца‑Иосифа) sits between 79° and 82° N in the Barents Sea, making it the most northerly landmass of Eurasia. Its surrounding waters are perennially cold, often below 0 °C, and are covered by sea ice for most of the year. These physical constraints have produced a marine fish assemblage that is both species‑poor and heavily weighted toward high‑Arctic endemics.

The first systematic inventory of the near‑shore fish fauna was undertaken in the summer of 2013, when a multidisciplinary team combined scuba diving, seine netting, and plankton sampling with deep‑water drop‑camera deployments. The expedition recorded sixteen species from seven families in the shallow coastal zone and added a seventeenth species from historic collections, establishing a baseline for a region that has long been under‑studied.

Understanding the composition and dynamics of this community is crucial because the Barents Sea is a key gateway for Atlantic water inflow, and any shift in its biological structure may reverberate through the broader Arctic marine ecosystem. The following sections summarise the study area, research methods, historical context, recent findings, and emerging uncertainties.

Study Area

The study focused on the near‑shore waters of the Franz Josef Land archipelago, encompassing coastal zones around the main islands of Rudolf Island, Hall Island, and Wilton Island. Depths sampled ranged from the intertidal zone to 400 m, with particular attention to habitats such as kelp forests, rocky reefs, and ice‑influenced benthic zones. Seasonal sea‑ice cover limits primary productivity, but during the brief summer melt a thin phytoplankton layer supports a modest zooplankton community, which in turn underpins the fish assemblage.

What Scientists Measure

Researchers recorded species presence, depth distribution, and associated habitat types. Methods included:

• Scuba surveys at depths of 5–20 m, providing direct visual observations and specimen collection.
• Standardised seine and gill‑net hauls to capture demersal and pelagic species.
• Plankton nets targeting early life stages and small pelagic fishes.
• Drop‑camera deployments at 32–392 m, documenting deep‑water fauna and substrate.

Physical parameters such as water temperature, salinity, and ice cover were logged concurrently, enabling correlations between environmental conditions and species occurrence.

Historical Evidence

Prior to the 2013 survey, knowledge of Franz Josef Land’s fish fauna derived mainly from offshore trawl surveys conducted between 110 m and 620 m depth. Those efforts documented a total of 43 species from 15 families, but offered little insight into the shallow, near‑shore habitats that support breeding and nursery grounds. Early 20th‑century Russian expeditions recorded occasional catches of Atlantic cod (*Gadus morhua*) and capelin (*Mallotus villosus*), interpreted as transient migrants rather than resident populations.

Recent Research

The 2013 expedition identified sixteen near‑shore fish species, of which twelve (75 %) are Arctic endemics. Two species—Greenland shark (*Somniosus microcephalus*) and Esipov’s pout (*Gymnelus esipovi*)—were recorded for the first time in the region. The shark, measuring approximately 2 m, was observed on a drop‑camera image near Hayes Island at a depth of 211 m, illustrating the occasional presence of large, deep‑water predators in the archipelago’s waters. *Gymnelus esipovi* was collected at a depth of 15 m within a kelp forest off Wilton Island, extending the known range of this Zoarcidae member.

Including the historic record of the tape‑body pout (*Gymnelus taeniatus*) from Kuhn Island, seventeen fish species are now recognised from the near‑shore zone. The remaining species encompass a mix of high‑Arctic specialists (e.g., Arctic cod *Boreogadus saida*, polar cod) and occasional warm‑water waifs such as Glacier lanternfish (*Benthosema glaciale*) and White barracudina (*Arctozenus rissoi*).

The dominance of endemic species reflects the archipelago’s isolation, low temperatures, and extensive sea‑ice cover, which together limit colonisation by temperate taxa.

What Has Changed

Arctic surface waters have warmed at a rate exceeding 0.5 °C per decade over the past three decades, driven by increased Atlantic inflow and reduced sea‑ice extent. This warming is projected to alter the distribution of both prey (e.g., zooplankton) and predators, potentially facilitating the northward expansion of sub‑Arctic species such as Atlantic cod and reducing the habitat suitability for strictly Arctic endemics. The 2013 baseline therefore serves as a reference point for detecting future compositional shifts.

Uncertainty and Open Questions

Key knowledge gaps include:

• Long‑term trends in species abundance and distribution, given the paucity of repeated surveys.
• Physiological tolerances of endemic fishes to rising temperatures and decreasing ice cover.
• Potential for invasive species introductions via shipping traffic through the Northern Sea Route.
• Interactions between fish communities and higher trophic levels, notably polar bears and seals that rely on fish‑rich habitats during the ice‑free season.

Addressing these uncertainties will require coordinated, multi‑annual monitoring programmes that integrate acoustic surveys, genetic barcoding, and satellite‑derived sea‑ice metrics.

Data Sources

Primary data were generated by the interdisciplinary 2013 expedition, a collaboration among the National Geographic Society, the University of Hawai‘i System, and the Zoological Institute of the Russian Academy of Sciences. Ancillary datasets include historic Russian trawl records (1960s–1990s), satellite sea‑ice concentration archives (NSIDC), and oceanographic observations from the Barents Sea Monitoring Programme.

All raw video, specimen vouchers, and environmental measurements are archived at the National Geographic Research Data Repository and are accessible to qualified researchers upon request.