RV Lough Foyle LF/28/95
Cruise summary report
|Ship name (ship code)||RV Lough Foyle (74LG)|
|Cruise period||1995-11-26 — 1995-11-29|
|Port of departure||Belfast, United Kingdom|
|Port of return||Belfast, United Kingdom|
|Objectives||Larval herring survey
1. To survey the distribution and abundance of herring larval from the Manx and Mourne Irish Sea stocks, to produce a larval production estimate (index) and provide data on larval drift.
2. To investigate the abundance of euphausiids and other macro zooplankton in the Irish Sea.
|Chief scientist||Mark Dickey-Collas (Department of Agriculture for Northern Ireland)|
|Cruise report||(0.18 MB)|
|General||Irish Sea and St. George's Channel|
|Subsurface temperature and salinity measurements||Quantity: sample litres = 6000000|
Description: Over 6 million litres of seawater were sampled during the cruise. The temperature and salinity of the water column was monitored with the Pronet system
|Biology and fisheries|
|Zooplankton||Quantity: number of hauls = 24|
Description: Hauls 1 to 9 and 26 to 41 were made. At each station the high speed plankton sampler was deployed to 4m off the sea bed. The plankton samples were sorted and all the fish removed and identified
|Eggs and larvae||Quantity: number of hauls = 24|
Description: Hauls 1 to 9 and 26 to 41 were made. The herring larvae were measured to the nearest 0.1 mm and then fixed in 99% ethanol. The length frequencies of herring larvae at each station were adjusted to give numbers per metre squared, and then used to back calculate a larval abundance index, using a growth and mortality rate.