1. To make acoustic surveys of spawning herring concentrations off the Yorkshire coast and pre-spawning concentrations elsewhere in the Central North Sea, using a towed body in conjunction with the echo integrators.
2. To obtain samples of adult herring from the central North Sea for age and fecundity analysis.
3. To make hauls with the 20 inch high-speed plankton sampler in the Longstone area, in order to identify herring spawning sites more precisely.
R J Wood (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
North Sea Irish Sea and St. George's Channel
Biology and fisheries
Eggs and larvae
Quantity: number of stations = 20 Description: sampled with the high-speed plankton sampler for herring larvae.