Now showing items 1-5 of 5
How many fish need to be measured to effectively evaluate trawl selectivity?
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
The aim of this study was to provide practitioners working with trawl selectivity with general and easily understandable guidelines regarding the fish sampling effort necessary during sea trials. In particular, we focused on how many fish would need to be caught and length measured in a trawl haul in order to assess the selectivity parameters of the trawl at a designated uncertainty level. We also ...
Broadening the horizon of size selectivity in trawl gears
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-12)
The discussion of alternative harvest patterns in commercial fisheries has been raised by stock assessment and fishery modelers, especially in the wider context of balanced harvesting. But often, these theoretical approaches propose alternative exploitation patterns that are difficult to achieve within the current limitations in the selectivity characteristics of fishing gears, such as trawl gears. ...
Effect of Codend Circumference on the Size Selection of Square-Mesh Codends in Trawl Fisheries
(Peer reviewed, 2016-07-29)
It is well established that increasing mesh number in the circumference of a diamond-mesh trawl codend can reduce size selection for round fish, whereas selection for flat fish species is unaffected. This effect has also been documented in Mediterranean trawl fisheries. In contrast, no information is available with regard to the effect of increasing mesh number in the circumference of square-mesh ...
Understanding and predicting size selection in diamond-mesh cod ends for Danish seining: a study based on sea trials and computer simulations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-06-28)
Danish seining is an important ﬁshing method used to harvest demersal species. Knowledge about the size selectivity of different demersal species with this type of ﬁshing gear is therefore of importance for managing the exploitation of marine resources. However, there are only limited data on size selection in cod ends in this ﬁshery. Sea trials were therefore carried out to collect size selectivity ...
Assessment of the Relative Catch Performance of a Surrounding Net without the Purse Line as an Alternative to a Traditional Boat Seine in Small-Scale Fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-30)
The catch performance of a traditional Ligurian boat seine, which is not in line with the European Union regulation, was compared with an experimental surrounding net without the purse line as a potential legal alternative. The relative catch performance between the two gear types was assessed using a new catch comparison method requiring neither paired data collection nor equal number of hauls with ...