RRS John Murray JM2/80
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM2/80 |
| Cruise period | 1980-05-02 — 1980-05-15 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | 1) To compare the vertical distributions and diurnal migrations of the development stages of Calanus Finmarchicus, Thysanoessa Longicaudata and Sagitta Maxima from the open ocean with Calanus Helgolandicus, Thysanoessa Inermis and Sagitta Elegans from the Celtic Sea.
2) To measure the feeding rates of all species used in the experimental programme under ambient conditions 3) To obtain fresh material for length/dry weight measurements and to deep freeze material for the determination of carbon, nitrogen, ash and calorific content, of all species used in the experimental programme. |
| Chief scientist | Bob Williams (Institute of Marine Environmental Research, Plymouth) |
| Cruise report |  (0.08 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Description: Cont. recording on Celtic Sea Site. |
| CTD stations | Quantity: number of stations = 7 |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 42 |
| Particulate organic matter (inc POC, PON) | Quantity: number of stations = 42 |
| Biochemical measurements (eg lipids, amino acids) | |
| Phytoplankton | Quantity: number of stations = 42 |
| Zooplankton | Quantity: number of stations = 42 Description: also 30 feeding exp.;distribution,biomass,population structures |
| Seston | Quantity: number of stations = 42 |
| Other biological/fisheries measurement | Quantity: number of stations = 42 Description: particle size analysis |
