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Population Structure

Fish population structure

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Shafiullah Habib Liton
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11 views18 pages

Population Structure

Fish population structure

Uploaded by

Shafiullah Habib Liton
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
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Population structure

• Age
• Sex
• Size
• Genetic
Age
• Larvae
• Fry : yolk-sac has almost disappeared
swim bladder is operational
actively feed for itself
• Fingerling : fins can be extended
scales have started developing
typically about the size of a finger
• Adult
• Year class
How to determine fish age?
• Scales,
• Otoliths,
• Vertebrate,
• Fin spines,
• Eye lenses,
• Teeth,
• Bones of the jaw,
• Pectoral girdle,
• Opercular series
Sex
• Estimation percentage of Sex
• Male = ? %
• Female = ? %

• Sex ratio of Parapocryptes serperaster : 1: 1


How to determine sex
Size
• Marketable size (7-12 months)
• Size class
Genetic structure

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