This page contains stomach contents data from cleaner fish deployed in Norwegian salmonid farms. The description of the columns is as follows:
id: integer variable, individual identifier.
species: character, cleaner fish species. Takes values: Avl rognkjeks (farmed lumpfish), Berggylt (ballan wrasse), Rognkjeks (lumpfish), Bergnebb (goldsinny wrasse), Grønngylt (corkwing wrasse), Ogylt (farmed ballan wrasse)
length: float variable, cleaner fish length measured in cm. Standardised since 2020-04-01, with instructions to measure the length only to the caudal peduncle, not including the caudal fin (standard length).
weight: float variable, cleaner fish weight measured in g.
lice_quantity: number of salmon lice recovered in cleaner fish stomach.
skottelus_quantity: number of caligus elongatus recovered in cleaner fish stomach.
datetime: date as yyyy-mm-dd, time of sampling.
cloud_cover: character, cloud cover on sampling date. Takes values Overskyet (clouded), Delvis overskyet (partly clouded), Klarvær (Clear weather).
fish_type: character, farmed salmonid species. Takes values Laks (salmon) and Ørret (trout).
average_weight: integer, average weight of salmonid in g.
old_average_weight: integer, average weight of salmonid in g.
population_goldsinny: float, stocking density of goldsinny wrasse.
population_corkwing: float, stocking density of corkwing wrasse.
population_ballan: float, stocking density of ballan wrasse.
population_lumpfish: float, stocking density of lumpfish.
population_ogylt: float, stocking density of farmed ballan wrasse.
kelp_amount: integer, kelp amount in metres.
lice_moving: float, mean number of other motile lice per salmon in cage (from sample).
lice_mature: float, mean number of adult female lice per salmon in cage (from sample).
capture_method: character, capture method of cleaner fish. Takes values: Glip, hov, teine.
capture_location: character, sample location of cleaner fish. Takes values: Annet, Dødfiskhov, Gjengfangst, Notvegg, Skjul.
feeding_method: character. Takes values: Annet, Automat fôring pellet, Håndfôring pellet, Strømpe.
renhold_not: indicator for status of cleaning for cage, where 0 means clean, 1 less clean, and 2 least clean.
renhold_skjul: indicator for status of cleaning for hides, where 0 means clean, 1 less clean, and 2 least clean.
renhold_utstyr: indicator for status of cleaning for equipment, where 0 means clean, 1 less clean, and 2 least clean.
status_foring: indicator for status of feeding for cage, where 0 means good, 1 less good, and 2 bad.
kondis: float, condition factor for lumpfish calculated as in Engebretsen et. al 2024.
PO: integer, production area.
loc_anonymous: integer, anonymous locality indicator.
engebretsen2023all: indicator for whether observation was used in the stomach content analysis of Engebretsen et al. 2023.
engebretsen2023mainregression: indicator for whether observation was used in the main regression analysis of Engebretsen et al. 2023
engebretsen2023stockregression: indicator for whether observation was used in the regression analysis including lumpfish stocking density of Engebretsen et al. 2023
engebretsen2023conditionregression: indicator for whether observation was used in the regression analysis including lumpfish condition of Engebretsen et al. 2023
engebretsen2024: indicator for whether observation was used in the condition factor analysis of Engebretsen et al. 2024.
References: Engebretsen, Solveig, et al. "Salmon lice (Lepeophtheirus salmonis) in the stomach contents of lumpfish (Cyclopterus lumpus) sampled from Norwegian fish farms: Relationship between lice grazing and operational conditions." Aquaculture 563 (2023): 738967.
Engebretsen, Solveig, et al. "Condition factor tailored to lumpfish (Cyclopterus lumpus) used as cleaner fish in salmonid farms." Aquaculture Reports 35 (2024): 101996.