FRV Alba Na Mara 1817A
Cruise plan
| Cruise Info. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ship name (ship code) | FRV Alba Na Mara (74NM) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cruise identifier | 1817A | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cruise period | 2017-10-17 — 2017-11-03 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Status | Completed | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Port of departure | Greenock, United Kingdom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Port of return | Greenock, United Kingdom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Purpose | Research | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Objectives | Objectives
1. To conduct an acoustic survey designed to survey both the open and enclosed areas of the Clyde to ultimately provide an estimate of the abundance and distribution of herring and sprat 2. To obtain samples of herring and sprat for biological analysis, including age, length, weight, sex, maturity and ichthyophonus infection. 3. All other species caught will be measured for length and weight to establish a length weight relationship. 4. CTD profiles will be taken at the end of each trawl. Procedure Fishing gear will be transported to Greenock by lorry on 17 October and loaded onto the vessel. Scientific staff will travel by lab vehicle to join the vessel in Greenock on 19 October. The vessel will commence the survey on 20 October at the earliest opportunity. The survey will be carried out within an area bounded by approximately 55°N to 56°N and 04° 40' W to 05° 40' W. Echointegration will be carried out at 38, 120 and 200 kHz. Data gathered in the hours of darkness will not be used for stock assessment. Trawling operations will be carried out as and when marks are identified. Otoliths will be collected from a sub-sample of the herring and sprat to determine age. The maturity state and. presence of Icthyophonus infection will also be recorded. A CTD profile will be taken at the end of each trawl. The track will be similar to that of previous surveys. TSG data will be gathered during the survey. The survey will involve following a pre-set survey pattern, at a steaming speed of 8 knots. The vessel will berth at James Watt Dock, Greenock at the end of the survey ready for unloading on 3 November 2017. Staff will return to the laboratory on 3 November by minibus. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Chief scientist | Eric Armstrong (Marine Scotland Aberdeen Marine Laboratory) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cruise programme |  (0.07 MB) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ocean/sea areas | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| General | Inner Seas off the West Coast of Scotland | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Specific | Firth of Clyde | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Data held at BODC | Get data | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Series/Profiles | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 14 CTD/STD cast | Reference numbers Temperature of the water column Vertical spatial coordinates Salinity of the water column Concentration of suspended particulate material in the water column Density of the water column Electrical conductivity of the water column Chlorophyll pigment concentrations in water bodies Reference numbers Temperature of the water column Vertical spatial coordinates Salinity of the water column Concentration of suspended particulate material in the water column Density of the water column Electrical conductivity of the water column Chlorophyll pigment concentrations in water bodies
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