Swedish Agency for Marine and Water Management

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The Viviparous Blenny as an Indicator of Effects of Toxic Substances
Utförare miljöbevakning, Myndigheter, Fiskeriverket.
Utförare miljöbevakning, Myndigheter, Fiskeriverket.
Utförare miljöbevakning, Myndigheter, Naturhistoriska riksmuseet, NRM.
Ansvarlig organisasjon
1993 (engelsk)Rapport (Annet vitenskapelig)
Abstract [sv]

This is the final report from the project ”Viviparous blenny as an indicator of effects of toxic substances” designed to develop a system of environmental monitoring where the viviparous blenny, or eel-pout, (Zoarcesviviparus L.) is used as indicator species for occurrence of toxic substances in the sea and for ecological effects of such substances. The system should be possible to use both within programmes concerning monitoring of emissions and receiving waters as well as in long-term monitoring of reference areas. Several single species systems have been developed in order to enable laboratory measurements of biological effects of toxic substances. Reactions observed are, however, frequently difficult to transfer to ecologically relevant disorders in nature. A single species system for programmes concerning control of emissions and receiving waters should include not only measurement of effects on the individual level in the laboratory and the field, but also monitoring of population variations as well as, if the relevant substances are persistent and bioaccumulating, chemical analyses. If the species chosen is a fish, it should have the following properties:

♦ 1. A stationary mode of living throughout its entire life cycle. This is essential for linking observations to pollution in the controlled area.

♦ 2. Sufficiently large in size to provide samples large enough for individual chemical and physiological analyses.

♦ 3. Easy to catch, also as fry.

♦ 4. Rich abundance, preferably within a large area of dispersion.

♦ 5. Long life, which makes it possible to integrate effects through time and to investigate the importance of long-term exposure.

♦ 6. The possibility of determining age is required for analysis of dose/effect and for studies of the population’s age distribution, which may indicate disorders in reproduction or increased mortality.

♦ 7. Suitability for monitoring of emissions, which implies that it should be possible to register ecologically important effects of emission not only under controlled laboratory conditions but also in the field.

Jacobsson et al. (1986) demonstrated that the viviparous blenny has the above-mentioned characteristics. The authors base this statement on earlier knowledge as regards the six first requirements and on an experiment described in their paper with regard to the seventh. Several freshwater species also have the required properties but hardly any other marine species present in Swedish waters. This implies that the coast of western Sweden lacks good alternative indicator species; the national monitoring of concentrations of harmful substances makes use of the non-stationary flounder. Also in relation to our freshwater fishes, the blenny has an important advantage: It gives birth to live fry after a long gestation period (4—6 months). In this way, a general problem is eliminated in studies of reproduction parameters in fish, namely the difficulty to identify brood origin and measure reproduction success among individuals.

sted, utgiver, år, opplag, sider
Öregrund: Kustlaboratoriet, Fiskeriverket , 1993. , s. 29
Serie
Fiskeriverket Kustrapport 1992-1999, ISSN 1102-5670 ; 1993:6
Emneord [en]
viviparous blenny, toxic, environmental monitoring, eel-pout, emissions, migration, reproduction, fecundity, mortality
Emneord [sv]
tånglake, giftig, miljöövervakning, ål-pout, utsläpp, reproduktion, fruktsamhet, dödlighet
HSV kategori
Forskningsprogram
Finansiering, Nationellt finansierad miljöövervakning; Sveriges miljökvalitetsmål, Ett rikt växt- och djurliv
Identifikatorer
URN: urn:nbn:se:havochvatten:diva-304OAI: oai:DiVA.org:havochvatten-304DiVA, id: diva2:1456080
Tilgjengelig fra: 2020-07-31 Laget: 2020-07-31 Sist oppdatert: 2020-12-01

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