DOI: 10.5281/zenodo.17950781
title: FjordFish

description: FjordFish

FjordFish is an underwater imagery dataset (3002 images, 6350 annotated objects) across 27 classes (table 1) designed for training object detection models to detect and classify underwater marine fauna. The dataset focuses on North Atlantic coastal fish species inhabitating the Norwegian and Swedish coasts. Images were collected from videos taken during baited and unbaited remote underwater video surveys along the Swedish and Norwegian coasts. Images of coastal cod were also collected from a semi-natural mesocosm at the Institute of Marine Research Flødevigen research station. 

All images are fully framed to include diverse backgrounds and species assmeblages. Labels are provided in the YOLO format for YOLOv8 and newer, but can be converted to other formats.

Data managers:

David Poling - University of Agder, Norway - james.d.poling@uia.no

Tonje Knutsen Sørdalen - Institute of Marine Research, Norway -  tonjesordalen@gmail.com

If using this dataset for research, please cite: Poling, J. D., Sørdalen, T. K., Halvorsen, K., Thormar, J., Perry, D., & Larsen, T. (2025). FjordFish [Data set]. Zenodo. https://doi.org/10.5281/zenodo.17496689

Files:

FjordFish.zip:



images: 6350 images with numerical naming e.g. "1.jpg", "50.jpg"

labels: label files in YOLO .txt format with naming identical to their associated image e.g. "1.txt", "50.txt"


 

Table 1.






Class ID



Class Name



Common Name



Latin Name



Total Annotations





0



ballan



Ballan Wrasse



Labrus bergylta



93





1



cuckoo_female



Cuckoo Wrasse Female



Labrus mixtus



47





2



cuckoo_male



Cuckoo Wrasse Male



Labrus mixtus



31





3



corkwing_female



Corkwing Wrasse Female



Symphodus melops



456





4



corkwing_male



Corkwing Wrasse Male



Symphodus melops



1215





5



goldsinny



Goldsinny Wrasse



Ctenolabrus rupestris



1433





6



rock_cook



Rock Cook/Small-mouthed Wrasse



Centrolabrus exoletus



152





7



labrids_unknown



Labrids Unknown



Labridae sp.



333





8



cod



Atlantic Cod



Gadus morhua



811





9



cod_yoy



Cod Young of the Year



Gadus morhua



181





10



haddock



Haddock



Melanogrammus aeglefinus



7





11



pollack



Pollack



Pollachius pollachius



149





12



poor_cod



Poor Cod



Trisopterus minutus



22





13



saithe



Saithe



Pollachius virens



39





14



whiting



Whiting



Merlangius merlangus



101





15



gadids_unknown



Gadids Unknown



Gadinae sp.



200





16



spiny_dogfish



Spiny Dogfish



Squalus acanthias



684





17



sharks_unknown



Sharks Unknown



Squalidae sp.



0





18



brown_crab



Brown Crab



Cancer pagurus



190





19



green_crab



Green Crab



Carcinus maenas



38





20



hermit



Hermit Crab



Paguridae sp.



15





21



lobster



European Lobster



Homarus Gammarus



1





22



decapods_unknown



Decapods Unknown



Decapoda sp.



5





23



ling



Ling



Molva molva



30





24



two_spot_goby



Two Spot Goby



Pomatoschistus flavescens



113





25



black_goby



Black Goby



Gobius niger



1





26



sand_goby



Sand Goby



Pomatoschistus minutus



3