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Tridens wk 04-08 2022
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | Tridens (64T2) |
| Cruise identifier | wk 04-08 2022 |
| Cruise period | 2022-01-24 — 2022-02-24 |
| Status | Completed |
| Port of departure | Scheveningen, Netherlands |
| Port of return | Scheveningen, Netherlands |
| Purpose | Research |
| Objectives | In 2022 the Dutch part of the International Bottom Trawl Survey (IBTS) in the first quarter (Q1) was carried out by Tridens II. The survey is part of the EU Data Collection Framework (DCF), and the statutory tasks of the Ministry of Agriculture, Nature and Food Quality. This report describes the survey results and contains the cruise report of the trip.
During the IBTS sampling takes place with a fishing gear (GOV) and a larvae and egg net (MIK-net). The data of the fish catches are used for the ICES fish stock assessments for amongst others herring, cod, whiting, haddock and plaice. The data of the larvae catches are used for the stock assessments of herring. Furthermore, the data are used for other research concerning the North Sea ecosystem. Litter within the catches is sorted and categorized. This information is collected for reporting under the Marine Strategy Framework Directive (MSFD). In the five weeks (weeks 4 to 8, 2022) in which the Dutch IBTS was carried out, the majority of the stations could be sampled as internationally prescribed. A number of these samples is taken outside the prescribed area, because the Scottish and Danish colleagues had technical issues and as a result were unable to collect all their samples. In the end, 53 of the total of 57 planned stations with the fishing gear and 100 of the 114 stations with the larva gear were sampled. The results of the Dutch IBTS alone are difficult to compare directly with previous years due to the changes in the sampled area. In general, the same species have been observed. Remarkable, was the amount of blue whiting caught. Furthermore, the large catches of middle sized haddock and whiting were striking, as was already the case last year but has clearly continued. The preliminary international data show that the youngest year class (2021) of all target species was low. However, due to the technical and other issues experienced during the survey, large areas are not or limited sampled. This reduces the value of the indices of this year. |
| Chief scientist | Ralf van Hal (Institute for Marine Resources and Ecosystem Studies, IJmuiden) |
| Project | ICES International Bottom Trawl Survey (IBTS) |
| Coordinating body | International Council for the Exploration of the Sea (ICES) |
| Ocean/sea areas | |
| General | North Sea |
| Specific | Southern and Central North Sea (South of 57N) |
| Measurements | |
| Physical oceanography | |
| CTD stations | Quantity: number of stations = 52 Description: CTD Stations |
| Biology and fisheries | |
| Eggs and larvae | Quantity: number of hauls = 100 Description: MIK (Method Isaac) |
| Demersal fish | Quantity: number of hauls = 53 Description: GOV (Grande Ouverture) |
