# Effects of climate change on fist-feeding brown trout growth and metabolism: a mesocosm experiment

Elorri Arevalo, Stéphane Panserat, Iban Seiliez, Aitor Larrañaga, Agnes Bardonnet

► To cite this version:

Elorri Arevalo, Stéphane Panserat, Iban Seiliez, Aitor Larrañaga, Agnes Bardonnet. Effects of climate change on fist-feeding brown trout growth and metabolism: a mesocosm experiment. Fisheries Society of the British Isles Annual Symposium, Jul 2017, Exeter, United Kingdom., 162 p., 2017, Understanding fish populations. Symposium handbook. hal-01606524

HAL Id: hal-01606524

https://hal.science/hal-01606524

Submitted on 2 Jun 2020

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# Effects of climate change on first-feeding brown trout growth and metabolism: a mesocosm experiment

Contact: elorri.arevalo@gmail.com

AREVALO Elorri¹, PANSERAT Stéphane², SEILIEZ Iban², LARRAÑAGA Aitor³, BARDONNET Agnès¹

1-ECOBIOP, UMR 1224, INRA, Univ Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France

2-NUMEA, UMR 1419, INRA, Univ Pau & Pays Adour, 64310, Saint-Pée-sur-Nivelle, France

3-Laboratory of Stream Ecology, University of the Basque Country, Bilbao, Spain

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INRA
SCIENCE & IMPACT

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Universidad
del País Vasco

Euskal Herriko
Unibertsitatea

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## Context

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For Salmonids, **emergence** is a critical period during which high mortality rates occur. Indeed, young trout have a **limited amount of reserves** and they need to start food intake quite quickly to avoid mortality.

The aims of the present study were to better understand emerged brown trout response to Global Climate Change by:

(1) Describing the consequences of **starvation** on their nutritional status,

(2) Testing their ability to **recover** from a delayed first feeding,

(3) Analysing the effect of **temperature** on both

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## Material and Methods

### 2 temperatures * 3 conditions

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## Results

**Mortality:** On D₉, 12 fish died

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At 8°C: **4 S₉**

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At 11°C: **7 S₉ + 1 DF₉**

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Weight gain of survivors from D₀ to D₉ for each condition at 8°C and at 11°C

<figure><img src="image_16.png" /><figcaption>ASAT1: Amino-acid catabolism</figcaption></figure>

<figure><img src="image_17.png" /><figcaption>atg4b: Autophagy</figcaption></figure>

<figure><img src="image_18.png" /><figcaption>MuRF2: Proteasome</figcaption></figure>

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Energetic stress indicators

mRNA levels of genes involved in each pathway for each condition at 8°C and at 11°C
N = 6 by condition

## Conclusions

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* Growth and catabolism are **similar** between 8 and 11°C for Fed fish

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* A **higher** temperature exacerbates the metabolic **distress** induced by **starvation**

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* Despite 5 days of starvation, alevins are **able** to feed but **recovery**:

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* Is **not complete** after 4 feeding days

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* Is more **contrasted** at 11°C than at 8°C

* GCC increases the risk that temperature reaches values above 10°C and that prey are washed out by large floods

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* The strength of 0⁺ cohorts could decrease in relation to starvation in years of large spring floods and the increase in temperature should worsen this effect