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- Bjerselius, Rickard, et al.
(författare)
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Male goldfish reproductive behaviour and physiology are severely affected by exogenous exposure to 17 beta-estradiol
- 2001
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Ingår i: Aquatic Toxicology. - 0166-445X .- 1879-1514. ; 53:2, s. 139-152
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Tidskriftsartikel (refereegranskat)abstract
- Mature male goldfish were exposed to different concentrations of the natural hormone 17 beta -estradiol (El). Two methods of exposure were employed, via ingestion at 0, 1, 10 and 100 ug/g food and via the water at 0, 1 and 10 mug/l. The fish were exposed fur 74-28 days during the spawning period. The males were then paired with an artificially induced, spawning female and their sexual behaviour was observed during a 15 min period. The physiological status of the fish was also examined with respect to GSI. presence of milt and spawning tubercles and the blood plasma concentration of E-2. Despite the relatively short exposure period. exposure to physiological levels of E-2 was shown to severely affect the male goldfish reproductive behaviour and physiology. In conclusion, the results from this study and the ability to interpret the effects on this well-studied species, show that the effects of E-2, and possibly other estrogenic EDCs have severe effects at several vital levels of male goldfish reproduction. The results also suggests that the hormone E-2 can act as an endocrine disrupting chemical (EDC) in the environment.
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| 3. |
- Olsén, K. Håkan, et al.
(författare)
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Effects of the SSRI citalopram on behaviours connected to stress and reproduction in Endler guppy, Poecilia wingei
- 2014
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Ingår i: Aquatic Toxicology. - : Elsevier BV. - 0166-445X .- 1879-1514. ; 148, s. 113-121
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Tidskriftsartikel (refereegranskat)abstract
- Psychoactive drugs, such as selective serotonin reuptake inhibitors (SSRI) have been identified in high levels in effluents from Swedish sewage treatment plants (STP) at concentrations high enough to give pharmacological effects in fish. In humans SSRIs are used in the treatment of depression and they have anxiolytic effects. In the present study we exposed Endler guppy (Poecilia wingei) of both sexes to citalopram that showed the highest concentrations of SSRIs in STP effluents and studied reproductive and non-reproductive behaviour. Male courting behaviours were not affected compared to control fish after 14-28 days exposure to 1μgL-1. In two experiments exposing both sexes to 0.2, 2.3 or 15μgL-1 for 21 days, fish exposed to the two highest doses showed anxiolytic effects when placed in a novel environment (novel tank diving test, NT). Males were only affected by exposure to 15μgL-1. They had significantly longer latency to explore the upper half of the aquarium, more visits and longer time spent in the upper half, and showed less bottom freezing behaviour, all markers of anxiolytic behaviour. In females exposure to 2.3 or 15μgL-1 significantly increased freezing behaviour, while no effects on other behaviour variables were observed. No effects on shoaling behaviour could be discerned. These results show that citalopram have anxiolytic effects on guppy fish and thus affect ecologically relevant behaviours of importance to survival of fish.
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| 4. |
- Olsén, K. Håkan, 1952-, et al.
(författare)
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Exposure to carbamate fungicide iodocarb does not affect reproductive behavior or milt volumes in precocious male brown trout (Salmo trutta L.) parr
- 2020
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Ingår i: Fish Physiology & Biochemistry. - : Springer Nature. - 0920-1742 .- 1573-5168. ; 46, s. 1451-1460
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Tidskriftsartikel (refereegranskat)abstract
- Previous studies with olfactory-disturbing pesticides resulted after exposure in disturbed behavior and physiology in fish. In the present experiment, reproductive behavior and milt volumes of precocious brown trout (Salmo trutta L.) male parr were studied in a large stream aquarium after exposure to the olfactory-disturbing fungicide 15 μg l-1 IPBC (iodocarb; 3-iodo-2-propynyl butyl carbamate) for 96 h. The statistical analyses did not reveal any significant differences for time attending females between controls and IPBC-exposed males. Furthermore, there were no significant differences in milt volumes. However, when taking all fish into consideration, there were significant differences in milt volumes between parr that had been attending females and those had not been attending females. Controls that had attended females had significantly higher milt volumes than controls or IPBC-exposed males that had not attended females. Taking all control and IPBC parr into consideration, there was a statistically significant positive correlation between time attended females and volume of milt and gonadosomatic index (GSI), respectively. In summary, 15 μg l-1 IPBC did not have any significant effects on mature male parr reproductive behavior and milt volumes.
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| 9. |
- Carlsson, J, et al.
(författare)
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Kin-biased distribution in brown trout : an effect of redd location or kin recognition?
- 2004
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Ingår i: Heredity. - : Springer Science and Business Media LLC. - 0018-067X .- 1365-2540. ; 92:2, s. 53-60
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Tidskriftsartikel (refereegranskat)abstract
- A wide range of animals have been reported to show kin-biased behaviours, such as reduced aggressiveness and increased food sharing among relatives. However, less is known about whether wild animals also associate with relatives under natural conditions, which is a prerequisite to facilitate kin-biased behaviours and hence kin selection. We tested, by means of microsatellite polymorphism, correlations between pair-wise relatedness and pair-wise metric distance in wild brown trout ( Salmo trutta L.) under natural conditions in two streams. Our data show that young-of-the-year as well as older trout found close together also had a higher genetic relatedness in one of the two streams, whereas no relationship was found in the other stream. Very few half and full siblings were found in the second stream and under these conditions it is unlikely that kin-biased behaviours will receive positive selection. We discuss the underlying mechanisms for the observed structure and we specifically address the issue of whether the grouping of related individuals could reflect dispersal from the same spawning redds, or if it reflects active association with relatives, possibly conferring kin-selected advantages.
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| 10. |
- Carlsson, J., et al.
(författare)
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Microsatellites reveal fine-scale genetic structure in stream-living brown trout
- 1999
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Ingår i: Journal of Fish Biology. - : John Wiley & Sons. - 0022-1112 .- 1095-8649. ; 55:6, s. 1290-1303
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Tidskriftsartikel (refereegranskat)abstract
- Multilocus F(ST) estimates revealed a pronounced genetic structure at six microsatellite loci in brown trout Salmo trutta in Nordre Finnvikelv, with at least three breeding units that remained stable over time. Significant differences in allele frequencies were found between five sections within a 3-km range, even when no physical barriers prevented fish from migrating between sections. It is argued that geological structures may rise to patterns resembling isolation by distance. Seemingly, the most important factor causing genetic differentiation in Nordre Finnvikelv is genetic drift in small populations that are geologically subdivided by a tributary and by impassable waterfalls. Some correlation between previous behavioural observations and genetic structures were found.
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