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Realistic variations in substrate composition affect spawning preference and egg retention in river lamprey (Lampetra
Léa Daupagne1,2, Marius Dhamelincourt1,2, Anne Michaud1,2
1Université de Pau et des Pays de l'Adour, E2S UPPA, INRAE, ECOBIOP, Saint-Pée-sur-Nivelle, France.
Journal of Fish Biology
|July 14, 2022
Summary
River lamprey preferred pebbly substrates for spawning, leading to better egg retention and reduced egg loss. This highlights substrate
Area of Science:
- Ichthyology
- Reproductive Biology
- Ecology
Background:
- Egg drift from nests is a significant mortality factor for lithophilic fish species.
- The influence of substrate composition on egg retention and spawning site selection remains understudied.
Purpose of the Study:
- To investigate the impact of substrate composition on spawning preferences and egg retention in river lamprey (Lampetra fluviatilis).
- To determine if river lamprey exhibit substrate preference for optimal egg retention.
Main Methods:
- Conducted a two-option experimental study over a full breeding season.
- Presented river lamprey with different substrate options to assess spawning preference.
- Quantified mating occurrences and egg retention rates on each substrate type.
Main Results:
- River lamprey showed no initial substrate preference.
- Lamprey eventually favored the substrate that provided the most efficient egg retention.
- Pebbly substrates hosted 12 times more matings than sandy substrates, with 20% fewer eggs lost.
Conclusions:
- Substrate composition plays a crucial role in river lamprey spawning site selection and reproductive success.
- River lamprey behavior adapts to optimize egg retention, favoring substrates that minimize egg drift.
- Understanding substrate-spawning relationships is vital for conservation of lithophilic species.
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