Three feeds; fish faeces recovered from a recirculating aquaculture system (RAS), fish faeces combined with watercress roots (Nasturtium officinale), and a commercial pelleted feed formulated for pike-perch, were fed to European Noble crayfish (Astacus astacus) (average initial body weight ± SD was10.7 g ± 3.5; average initial body length ± SD was 3.1 cm ± 0.4) for 84 days at excess daily rations. Crayfish fed with the pelleted fish feed exhibited significantly (P < 0.05) higher mean final body weight ± SD (FBW, 13.84 g ± 1.24) compared to animals fed fish faeces (11.14 g ± 0.47) and those fed the combination of fish faeces/watercress roots (12.91 g ± 1.99). Mean final body length (FBL) and survival were also significantly higher in animals fed pelleted fish feed than all other treatments (P < 0.05). Faecal macronutrient contents (28.5% crude protein and 2% lipid) are within required dietary range of A. astacus, indicating poor growth performance was not related to quantitative faecal macronutrient composition. The lysine and methionine content of faecal waste was 13.1 g kg−1 and 3.8 g kg−1 respectively. The methionine content of the faecal waste was therefore considerably below (60% below requirement) the requirement for crayfish. Amino acids known to stimulate feed intake in crayfish were about 50% lower in concentration in faeces compared to concentrations in pelleted fish feed. The concentration of taurine was below detection limit in faeces. It is hypothesized that unsuitable amino acid composition and/or limited ability to handle faeces explain low growth and survival rates in A. astacus fed fish faeces and the combination of fish faeces/watercress roots.

Growth Performance and Survival in the Crayfish ( Astacus astacus ) Fed Fish Faeces, Combined Plant Root/Fish Faeces and a Commercial Pelleted Fish Feed

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Marcel Machnik

Author Tools

Chat about Author

Papers

Growth Performance and Survival in the Crayfish ( Astacus astacus ) Fed Fish Faeces, Combined Plant Root/Fish Faeces and a Commercial Pelleted Fish Feed