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Principal component analysis of alimentary canal metrics in developmental stages of the rainbow troutOncorhynchus mykiss (Walbaum, 1792) from Kashmir Valley, India

Indian Agricultural Research Journals

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Title Principal component analysis of alimentary canal metrics in developmental stages of the rainbow troutOncorhynchus mykiss (Walbaum, 1792) from Kashmir Valley, India
 
Creator Wali, Asifa
H. Shah, Tasaduq
Bhat, F. A.
Adnan Abubakr
Bilal Ahmad Bhat
Tariq Hussain Bhat
Nazir, Nageena
Ishrat Mohd
 
Subject Fingerling, Gut metrics, Intestinal length, Kashmir, Life cycle, Nutrition, O. mykiss, Raceways
 
Description  The primary objective of the research was to ascertain the variations in gut morphometry inrainbow trout Oncorhynchus mykiss during its life cycle spanning fry, fingerlings, yearlings,table-sized and brood-sized fish. The gut morphometric parameters viz., total length (a),standard length (b), weight (c), gut length (d), gut weight (e), intestinal length (f), liver weight (g),relative length of the gut (h), intestinal coefficient (i), relative gut mass (j), Zihlers index (k),hepatosomatic index (l) and gastrosomatic index (m) were all significantly correlated,according to the component pattern profile. The biplots that were created helped to explainthe variations in the data. From the principal components PC1 and PC2, the variable i(intestinal coefficient) of O. mykiss in all five stages was responsible for the largest variation.This was followed by variations from PC1 that were related to the variables h (relative lengthof the gut), j (relative gut mass), m (gastrosomatic index), d (gut length), e (gut weight) andf (intestinal length). The largest variation in PC2 was caused by variable b (standard length),and was followed by variation caused by variable a (total length). As a result, gut length(d=0.354431), gut weight (e=0.342041), weight (c=0.333106), total length (a=0.320632),intestinal length (f=0.301986), relative gut length (h=0.241842), Zihlers index (k=0.238940),relative gut mass (j=0.247716) and gastrosomatic index (m=0.233688) all showed highpositive component loading. Through the use of basic metrics to assess different gutparameters, we were able to ascertain the feed and nutritional needs of O. mykiss at differentdevelopmental stages. Understanding alimentary canal shape is crucial for fish digestionand for optimising fish nutrition as fish digestive systems and feeding practices advance.
Keywords:Fingerling, Gut metrics, Intestinal length, Kashmir, Life cycle, Nutrition, O. mykiss, Raceways
 
 
Publisher Central Marine Fisheries Research Institute (on behalf of Indian Council of Agricultural
 
Date 2023-12-31
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier https://epubs.icar.org.in/index.php/IJF/article/view/123836
10.21077/ijf.2023.70.4.123836-09
 
Source Indian Journal of Fisheries; Vol. 70 No. 4 (2023)
0970-6011
 
Language eng
 
Relation https://epubs.icar.org.in/index.php/IJF/article/view/123836/53531
 
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