A study by Kennedy and Jónsson (2020) revised the method of converting barrels of roe to landings of ungutted lumpfish based on information in logbooks from the female lumpfish fishery. With consent from the Directorate of Fisheries and National Association of Small Boat Owners (NASBO, Landssamband smábátaeigenda, LS) the lumpfish logbooks for the period 1980--2016 are made public here on the Hafró web.
The data and a disclaimer
The lumpfish logbook dataset used in the analysis behind conversion factors from barrels to ungutted lumpfish is available for download, either as an MS XL-file or as csv-file.
The columns in the data sets made available here are:
- vessel_id: Unique randomized id for each vessel.
- ar: Year when fishing took place.
- dags: Date when nets were visited.
- reitur: Position of the gillnet set given as statistical sub-rectangle (15 minutes latitude x 30 minutes longitude) coded in the Icelandic 'tilkynningaskyldu' system, as 'smáreitir'.
- dypi: Depth at which nets were set.
- dregin: Number of nets in set.
- naetur: Soak time as number of nights in the sea.
- fj: Number of females caught in the set.
- kg: Amount of roe (in kg) from the catch in the set.
- verkun: Processing stage for the roe.
- 1. Roe with all fluid.
- 2. Drained roe.
- 3. Roe ready for salting.
- 4. Salted roe.
- net: Type of net used, 1: short (40 m) or 2: long (80 m).
- moskvi: Mesh used, 1: 10.5", 2: 11.5", and 3: Mixed meshes.
- tunnur: Number of barrels caught by the vessel in season.
- hrogn: Total amount of roe (?).
- svaedi: Regulation area in which the fishery took place, see lumpfish regulation.
- lat: Latitude in decimal degrees center of reported rectangle.
- lon: Longitude in decial degrees, center of reported rectangle.
Note that columns that are recoreded as constants for a season (verkun, net, moskvi, tunnur, hrogn, svaedi) are repeated for every entry for a vessel in a year/season.
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Kennedy and Jónsson (2020)
The analysis referred to in the introduction has been published both in English and Icelandic in the MFRI series Haf- og Vatnarannsóknir as:
Converting number of barrels of lumpfish roe to ungutted landings based on logbook data
James Kennedy and Sigurður Þór Jónsson
Haf- og vatnarannsóknir 2020-33:1-9 (June 2020)Abstract
The method for converting the time series of barrels of roe produced to ungutted lumpfish was reviewed and revised due to the uncovering of errors in how the data was treated. Correcting these errors along with a slight revision of the method (reconsidering the average gonadosomatic index of lumpfish), increased estimated landings for the period 1985--2007 by approx. 10%. In addition, we now take into account the fact that the weight of landed roe was recorded as 20% lower than the actual weight (the so-called 'sullprósenta') by the Directorate of Fisheries from 2008-2016. Taken together, this increased the reference value of Fproxy from 0.67 to the former value of 0.75, which would result in a corresponding increase in advised TAC to 5200 tonnes for the 2020 female lumpfish season. Logbook data used in the analysis have been made publicly available on https://data.hafro.is/research/lumpfish_logbooks/.
Also available in Icelandic:
Umreikningur á fjölda tunna af grásleppuhrognum yfir í óslægðan afla byggður á veiðdagbókum
James Kennedy and Sigurður Þór Jónsson
Haf- og vatnarannsóknir 2020-32:1-9 (June 2020)