Growth and macronutritional requirements of signal crayfish Pacifastacus leniusculus (Dana) in aquaculture.

Wolf, Yarno Sebastian (2004) Growth and macronutritional requirements of signal crayfish Pacifastacus leniusculus (Dana) in aquaculture. (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, 135 pp.

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Abstract

In Europe, increased attempts to intensify crayfish aquaculture have been carried out in recent years. Some of the major problems arising from the intensification are related to dietary supply of the animals in culture ponds and tanks. This study therefore focussed on some of the key objectives supporting the development of suitable diets for signal crayfish Pacifastacus leniusculus aquaculture. A large-scale response surface experiment was carried out to study the influences of different macronutrients (protein, lipid, carbohydrate) on crayfish growth and body composition. The results from this experiment led to the development of an improved experimental diet containing high levels of protein and carbohydrates, while increased lipid concentrations seemed to be influencing growth adversely. Further experiments were carried out to improve diet quality. For this purpose, diet types and the suitability of different binding agents were investigated. A small experiment was carried out to monitor the effects of attractants on growth of juvenile signal crayfish. A second objective of this study was the establishment of a new method to measure physiological responses of crayfish to different treatments. Running mid-term or long term experiments require high amounts of resources and slow down the process of dietary development. The measurement of RNA/DNA ratio has proven to be a suitable instrument to examine short-term metabolic responses to different key factors such as feeding regime, diet quality and digestibility and bioavailability of essential nutrients. The study has stressed the importance of proper diet preparation and composition for successful astaciculture. Binding agents were found to have major influence on diet digestibility and bioavailability of macronutrients. As another result of this study, further experiments are regarded to be necessary to examine the response of signal crayfish to different levels of lipid and protein in their diet. Some of the results obtained suggest a lack of regulatory capacity regarding the animals’ protein/lipid ratio. Further experiments however will have to be carried out to proof this hypothesis.

Document Type: Thesis (PhD/ Doctoral thesis)
Thesis Advisor: Rosenthal, Harald
Keywords: Pacifastacus leniusculus dana, Aquakultur, Tierernährung, Wachstum, Crayfish farming, Nutrition, aquaculture, RNA/DNA ratio, Mixture Approach
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: No
Date Deposited: 11 Feb 2010 11:12
Last Modified: 27 Jan 2023 08:48
URI: https://oceanrep.geomar.de/id/eprint/3908

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