Eel-pout (Zoarces viviparus L.) as a marine bioindicator

Schladot, J. D.; Backhaus, F.; Ostapczuk, P.; Emons, Hendrik

doi:10.1016/s0045-6535(97)00073-8

Cited by 23 publications

(7 citation statements)

References 5 publications

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“…In addition to these life history traits, practical reasons (e.g., ease of capture by passive fishing devices such as fyke nets) have contributed to give the eelpout a potential as a suitable bioindicator species for use in marine toxicological studies. Due to its relatively stationary habit, it is appropriate for both regional and point-source studies on the effects of exposure to anthropogenic contaminants (Schladot et al, 1997;Noaksson et al, 1998;Stentiford et al, 2003;Lyons et al, 2004). Furthermore, histological investigations have demonstrated the occurrence of intersex (ovo-testis) in male fish collected from contaminated coastal sites (Gercken and Sordyl, 2002;Stentiford et al, 2003;Gercken, 2007).…”

Section: Introductionmentioning

confidence: 99%

Liver histopathology in Baltic eelpout (Zoarces viviparus) – A baseline study for use in marine environmental monitoring

Fricke

Stentiford

Feist

et al. 2012

Marine Environmental Research

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Section: Introductionmentioning

confidence: 99%

Liver histopathology in Baltic eelpout (Zoarces viviparus) – A baseline study for use in marine environmental monitoring

Fricke

Stentiford

Feist

et al. 2012

Marine Environmental Research

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“…The marine viviparous eelpout is a wellrecognized species in aquatic toxicology in northern Europe (Jacobsson et al, 1986;Schladot et al, 1997), and there is a growing interest in its use in endocrine-disruption research (Christiansen et al, 1998;Larsson et al, 2000;Matthiessen, 2003). The eelpout is a differentiated gonochorist in which the early indifferent gonad develops directly into either an ovary or a testis.…”

mentioning

confidence: 99%

Gonadal morphogenesis and sex differentiation in intraovarian embryos of the viviparous fishZoarces viviparus (Teleostei, Perciformes, Zoarcidae): A histological and ultrastructural study

2006

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It is essential to know the timing and process of normal gonadal differentiation and development in the specific species being investigated in order to evaluate the effect of exposure to endocrine-disrupting chemicals on these processes. In the present study gonadal sex differentiation and development were investigated in embryos of a viviparous species of marine fish, the eelpout, Zoarces viviparus, during their intraovarian development (early September to January) using light and electron microscopy. In both sexes of the embryos at the time of hatching (September 20) the initially undifferentiated paired bilobed gonad contains primordial germ cells. In the female embryos, ovarian differentiation, initiated 14 days posthatch (dph), is characterized by the initial formation of the endoovarian cavity of the single ovary as well as by the presence of some early meiotic oocytes in a chromatin-nucleolus stage. By 30 dph, the endoovarian cavity has formed. By 44 dph and onward, the ovary and the oocytes grow in size and at 134 dph, just prior to birth, the majority of the oocytes are at the perinucleolar stage of primary growth and definitive follicles have formed. In the presumptive bilobed testis of the male embryos, the germ cells (spermatogonia), in contrast to the germ cells of the ovary, remain quiescent and do not enter meiosis during intraovarian development. However, other structural (somatic) changes, such as the initial formation of the sperm duct (30 dph), the presence of blood vessels in the stromal areas of the testis (30 dph), and the appearance of developing testicular lobules (102 dph), indicate testicular differentiation. Ultrastructually, the features of the primordial germ cells, oogonia, and spermatogonia are similar, including nuage, mitochondria, endoplasmic reticulum, and Golgi complexes.

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“…The eelpout constitutes an important link in the benthic ecosystem as prey for other fish species and waterbirds. Because of its wide distribution, its stationary behaviour and its capability to accumulate hazardous substances, the eelpout is an excellent organism for biomonitoring (Schladot et al 1997;Hedman et al 2011). HELCOM (cf.…”

Section: Multimetric Indicesmentioning

confidence: 99%

Biological indicators

Zettler¹,

Darr²,

Labrenz³

et al. 2017

Biological Oceanography of the Baltic Sea

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Changes in living conditions caused by natural variability or anthropogenic activitieselicit distinct responses of species, populations and communities. Bioindication is the recording of such responses and the entity measured is called a "bioindicator". 2. A bioindicator can be any relevant component or measure that can be used to estimate the environmental status based on the performance of all types of organisms (prokaryotes, protists, macroalgae, vascular plants, invertebrates, fish, mammals), including bulk measurements such as the chlorophyll a concentration in the seawater or the lower depth limit of macrophytes. 3. To be able to conclude if environmental change has taken place based on bioindication, it is essential to have knowledge of the specific ecological requirements of the organisms with respect to their habitats. 4. Bioindication using individuals or species includes e.g. behavioural adaptations, modifications of organ and cell structures and changes in population dynamics. 5. Bioindication by recording dramatic increases or decreases in the proportion and/or density of species in a community provides a conspicuous sign of environmental change, especially when this includes the extinction of species. 6. Strong decreases and extinctions of species in a community coupled to immigration of non-indigenous species may signify a shift in community composition that has a bearing on the functioning of the entire ecosystem. 7. Bioindication is a major tool used in the implementations of the EU environmental legislation: the Habitats Directive (HD), the Water Framework Directive (WFD) and the Marine Strategy Framework Directive (MSFD).

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Eel-pout (Zoarces viviparus L.) as a marine bioindicator

Cited by 23 publications

References 5 publications

Liver histopathology in Baltic eelpout (Zoarces viviparus) – A baseline study for use in marine environmental monitoring

Liver histopathology in Baltic eelpout (Zoarces viviparus) – A baseline study for use in marine environmental monitoring

Gonadal morphogenesis and sex differentiation in intraovarian embryos of the viviparous fishZoarces viviparus (Teleostei, Perciformes, Zoarcidae): A histological and ultrastructural study

Biological indicators

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