Marine

Scallop Stock Assessment

July 6, 2018 by Marine Directorate Communications No Comments | Category Marine Directorate general, Marine Directorate Science, Marine Directorate Surveys, Research Vessel Surveys

Survey: 1018A

Duration: 4-23 July 2018

Fishing Gear: Scallop dredges

Objectives

1. To carry out a survey of scallop stocks on the East Coast.
2. To age, measure and assess shell damage on all scallops caught.
3. To collect information on by-catch of other commercial fish and shellfish species.
4. To identify and quantify numbers of starfish species in all dredge tows.
5. To collect frozen whole scallops for heavy metal testing as part of the OSPAR assessment of hazardous substances in the marine environment.
6. To carry out camera trials if conditions and time allow.
7. To record and retain marine litter obtained during the dredging process (monitoring for MSFD).

Procedure

Figure 1: Survey station locations for scallop dredge survey 1018A

The survey will depart from Fraserburgh on 4 July and after vessel drills, will head for the first station of the survey.

Scallop dredge hauls will be made at sites used on previous surveys as shown in Figure 1. Hauls will be of 30 minutes duration. From each haul, all of the scallops will be measured to the half centimeter below and aged. In addition, numbers and size distribution of commercial fish and shellfish species will be recorded along with scallop shell damage and starfish numbers and species. Scallops (ten individuals per station) will also be collected from selected sites and frozen for heavy metal analysis back at the laboratory. Any litter collected in the dredges will be recorded as set out in the SOP and placed in bags to be disposed of on return to port. Camera trials will be carried out if conditions and time allow – with the aim being to collect footage of the fishing gear while in operation.

The survey will end in Fraserburgh on 23 July 2018 where all equipment and staff will then return to the laboratory.

Further Information:

• Marine Scotland research vessels and surveys
• Other research vessel survey blogs

Tags: Alba na Mara, east coast, scallop dredges, science, surveys

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