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UBC Theses and Dissertations
Interactions between growth, sex, reproduction, and activity levels in control and fast-growing strains of Nile tilapia (Oreochromis niloticus) Bozynski, Chantelle Carole
Abstract
Cultured fish play an important role i n meeting increasing demands of human consumption around the world. To meet consumer demand for larger-sized fish, fish culturist seek strains that possess a high growth rate and reach harvestable size before attaining sexual maturation. Given the importance for farmers of understanding growth phenomena and controlling sexual maturation in fish stocks, this thesis examined the relationship between growth, behavioural activity, and sexual maturation i n control strains of Nile tilapia, Oreochromis niloticus, and i n strains resulting from a project devoted to the Genetic Improvement of Farmed Tilapias (GIFT). Behavioural activity of fish groups was videorecorded each month of the three month study period. Under laboratory conditions, the fast-growing GIFT fish performed less locomotory and agonistic activity than the slow-growing control fish. Mirror image stimulation tests performed on individual males supported the finding that controls are more aggressive than GIFT fish. In the comparison of females and males, the fast-growing male GIFT performed less locomotory, but more agonistic behaviour than the slow-growing female GIFT. In the controls, growth rates of males and females were relatively similar even though, the male controls performed more locomotory and agonistic behaviour than the female control fish. In all, low growth was associated with a high activity level; however, a few experimental observations appear to deviate from this relationship and are discussed. Nesting behaviour, which is often the first indication of sexual maturity, was observed only i n males. Male controls performed more nesting behaviour than male GIFT fish. Also, significantly more nests were built by the control than GIFT fish. This suggest, at least i n males, that the slow-growing control fish became sexually mature sooner, and at a smaller size than the fast-growing GIFT fish. Furthermore, male GIFT fish required more time to complete their nest(s), and built fewer nests than male control fish.
Item Metadata
Title |
Interactions between growth, sex, reproduction, and activity levels in control and fast-growing strains of Nile tilapia (Oreochromis niloticus)
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1998
|
Description |
Cultured fish play an important role i n meeting increasing demands of human
consumption around the world. To meet consumer demand for larger-sized fish,
fish culturist seek strains that possess a high growth rate and reach harvestable size
before attaining sexual maturation. Given the importance for farmers of
understanding growth phenomena and controlling sexual maturation in fish stocks,
this thesis examined the relationship between growth, behavioural activity, and
sexual maturation i n control strains of Nile tilapia, Oreochromis niloticus, and i n
strains resulting from a project devoted to the Genetic Improvement of Farmed
Tilapias (GIFT). Behavioural activity of fish groups was videorecorded each month
of the three month study period.
Under laboratory conditions, the fast-growing GIFT fish performed less locomotory
and agonistic activity than the slow-growing control fish. Mirror image stimulation
tests performed on individual males supported the finding that controls are more
aggressive than GIFT fish. In the comparison of females and males, the fast-growing
male GIFT performed less locomotory, but more agonistic behaviour than the slow-growing
female GIFT. In the controls, growth rates of males and females were
relatively similar even though, the male controls performed more locomotory and
agonistic behaviour than the female control fish. In all, low growth was associated
with a high activity level; however, a few experimental observations appear to
deviate from this relationship and are discussed. Nesting behaviour, which is often the first indication of sexual maturity, was
observed only i n males. Male controls performed more nesting behaviour than male
GIFT fish. Also, significantly more nests were built by the control than GIFT fish.
This suggest, at least i n males, that the slow-growing control fish became sexually
mature sooner, and at a smaller size than the fast-growing GIFT fish. Furthermore,
male GIFT fish required more time to complete their nest(s), and built fewer nests
than male control fish.
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Extent |
5381476 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-20
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0074831
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.