Swedish Agency for Marine and Water Management

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Guidelines For Coastal Fish Monitoring
Perfomers of environmental monitoring, Government Agencies, National Board of Fisheries.
Responsible organisation
1996 (English)Report (Other academic)
Abstract [en]

Fish are studied to an increasing extent in environmental monitoring around the coasts of Sweden, and the coastal fishery has a good potential for further development. Standardized techniques for long-term monitoring and predictions of the size and productive capacity of fish populations, as well as continuous control of their health in a wide context thus are required. This report describes a basic programme and guidelines designed to study coastal fish. The system also constitutes a basis for an integration of physiological health studies and measurements of contaminant levels with basic ecological data. Both population monitoring and collection of fish for analytical purposes are done by means of fishing using established methods -gill nets and fyke nets. A detailed description of the principles behind the systemis given by Neuman (1985).

The monitoring and prognosis system is designed for coastal species. Such species mainly occur close to the bottom; the dominating pelagic fishes are mainly found further out to sea. In order to be able to link the reactions of the fish to the environmental situation in a specific study area, priority is given to stationary species, particularly with regard to measurements on the individual level. In addition, the system concentrates on relatively large species because they are often of commercial interest, they allow individual chemical and biological analyses and are easy to catch with established methods.

The species monitored, i.e., demersal (bottom-living) fairly large fish, can begrouped into two communities on the coasts of the Baltic: littoral, mainly stationary warm-water species, and less stationary cold-water species living in deeper water. The most common fish in the former group are perch, roach and ruffe, whereas the latter mainly consists of flounder, cod, sculpins, viviparous blenny, and whitefish. At the Swedish West Coast, cold-water species such as cod, flatfish, viviparous blenny and sea scorpion dominate also in shallow water; eel is the only major representative of warm-water fishes.

The design of the test fishing, as in all other monitoring of inter-year variations in biological processes, places strict demands on statistical planning. The methods described here have been developed through many years of pilot studies and statistical tests. By means of stratification as regards choice of species and size groups, depth intervals, stations and times of year, it has been possible to create statistically satisfactory programmes at reasonable expense. Consequently, this programme has a design that definitely separates it from inventory studies. However, such geographical mappings of, e.g., species distribution should be included in the predesign studies that should be made prior to each individual monitoring programme is started.

The flow of information through the system is described in the chart on p. 4. Other measurements on the individual level, being outside the scope of the basic programme described here - biomarkers, physiology, pathology etc. - can easily be included. A large number of such methods have been described by Neuman (1985). The basic programme is applied both in reference areas (Thoresson, 1993), e.g.,areas without local anthropogenic influence, and in polluted areas (Thoresson,1992).

A first edition of the Guidelines was printed in 1993. In this second edition some minor changes have been made. The Reproduction part has been revised according to recent observations on environmental impact on sexual maturation and the risk that feminizing substances may change sex rates.

Place, publisher, year, edition, pages
Öregrund: Kustlaboratoriet, Fiskeriverket , 1996. , p. 39
Series
Fiskeriverket Kustrapport 1992-1999, ISSN 1102-5670 ; 1996:2
Keywords [en]
fish, environmental monitoring, coastal fishing, guidelines, pelagic fishes, cold-water species, warm-water species
Keywords [sv]
fisk, miljöövervakning, kustfiske, riktlinjer, metod, pelagisk fisk, kallvattenarter, varmvattenarter
National Category
Fish and Aquacultural Science
Research subject
Finance, National; Environmental Objectives, A Rich Diversity of Plant and Animal Life
Identifiers
URN: urn:nbn:se:havochvatten:diva-316OAI: oai:DiVA.org:havochvatten-316DiVA, id: diva2:1456473
Available from: 2020-08-05 Created: 2020-08-05 Last updated: 2020-12-01

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