FRV Clupea 0573C
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | FRV Clupea (74CU) |
| Cruise identifier | 0573C |
| Cruise period | 1973-05-09 — 1973-05-25 |
| Status | Completed |
| Port of departure | Buckie, United Kingdom |
| Port of return | Buckie, United Kingdom |
| Purpose | Trials |
| Objectives | 1. To survey the ground approximately 10 miles NNE of Lossiemouth, select an area suitable for noise measurement work and to lay and calibrate a hydrophone range.
2. To make measurements of the noise generated by a) pair trawls, and b) a Danish seine net towed over the range. A preliminary echosounder survey of the seabed was made NNE of Lossiemouth and several grab samples of the seabed were obtained. |
| Chief scientist | Anthony D Hawkins (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
| Cruise report |  (0.11 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Specific | East of Lossiemouth, Spey Bay area |
| Measurements | |
| Biology and fisheries | |
| Gear research | Quantity: number of deployments = 5 Description: Hydrophones, approximately 100m apart were laid and attached to a line stretched between two anchored dahns. |
| Gear research | Quantity: number of deployments = 4 Description: Noise measurement runs for the pair trawling noise trials, made with the 'Bracoden' steaming alone over the range under different rpm and propeller pitch conditions |
| Gear research | Quantity: number of hauls = 3 Description: Seine net shots performed in the region of the hydrophone array. The first was performed with a single pinger attached to the headline of the net, and the second with four pingers arranged along the port rope. The third utilised a headline-mounted pinger, but in addition three divers made concurrent observations on the gear |
| Gear research | Quantity: number of deployments = 3 Description: 2 noise measurement runs towing a 32" mesh Appeldoorn gear, 1 haul was carried out using instruments attached to the 32" mesh gear to measure the geometry of the net and its fishing depth |
| Gear research | Quantity: number of deployments = 3 Description: 'Bracoden' and 'Replenish' noise measurement runs made. 2 with the hips towing a 24" mesh Appeldoorn gear, and 1 with them towing a Cosalt gear |
| Moorings, landers, buoys | |
| Biology and fisheries | |
| Gear research | 57° 42' 59" N 3° 12' 0" W — A range was laid consisting of 4 widely spaced hydrophones approximately 500 m apart, laid around the 'Mara's' anticipated fishing area |
