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The Interplay of Digestion and Osmor...

Ciavoni, Elisa.

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The Interplay of Digestion and Osmoregulation in the Gastrointestinal Tract of Salmonids.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Interplay of Digestion and Osmoregulation in the Gastrointestinal Tract of Salmonids./
Author:	Ciavoni, Elisa.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2024,
Description:	207 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Physiology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31472676
ISBN:	9798382828794

The Interplay of Digestion and Osmoregulation in the Gastrointestinal Tract of Salmonids.
Ciavoni, Elisa.

The Interplay of Digestion and Osmoregulation in the Gastrointestinal Tract of Salmonids. - Ann Arbor : ProQuest Dissertations & Theses, 2024 - 207 p.

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

Thesis (Ph.D.)--Wageningen University and Research, 2024.

In response to the growing demand for food and the need to reduce food waste, aquaculture is transitioning towards the use of alternative ingredients, such as plant-based substitutes. This shift aims to minimize competition with human food consumption and offset the declining availability of fish meal. However, replacing fish meal with plant-based ingredients can compromise the nutritional quality and digestibility of the diet, potentially affecting water and ion balance (osmoregulation) along the gastrointestinal tract (GIT) of fish. Osmoregulation involves the secretion of fluids that alter water fluxes along the GIT, maintaining ion balance and ensuring proper digestive function. Previous studies on osmoregulation have typically focused on starved fish. However, it is now recognized that feeding can influence osmoregulatory processes in the GIT during digestion. While the interplay between diet and osmoregulation remains a relatively unexplored area, understanding this relationship is crucial for optimizing feed formulation, fish growth performance and welfare. This research aimed to investigate the impact of dietary factors on GIT osmoregulation and digestion in two salmonids fish species: rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar). In Chapter 2 and 3, rainbow trout were fed diets with contrasting dietary electrolyte balance (dEB), buffering capacity (CaCO3), and macronutrient composition (protein-to-energy ratio) under freshwater conditions (0 ppt). The results indicated that dietary factors had minimal or no effect on osmoregulation (water fluxes) and digestion kinetics (nutrient fluxes) in the GIT of freshwater trout. Furthermore, regardless of dietary factors, water influx into the stomach is counteracted in the proximal intestine, implying that freshwater fish tend to minimize the water entering the GIT.

ISBN: 9798382828794Subjects--Topical Terms:

518431
Physiology.

The Interplay of Digestion and Osmoregulation in the Gastrointestinal Tract of Salmonids.
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