碩士 / 國立臺灣大學 / 漁業學系 / 84 / Age,growth and age composition of Trachinocephalus myops were
estimated by Walford-plot method and iterated age-length key
algorithm(IALK),the results were as follows:(1) The vertebral
character showed:(a)the larger the fork length, the more the
ring count;(b)relative positions of ring radius in all
vertebrae of the same specimen were analogous;(c)relative
positions of ring radius were analogous in different specimen
with same rings;(d)the frequency and mean ring radius were
significantly different between neighboring ring groups. Base
on above results, the present study made sure that the vertebra
was an effective age character.(2)There were significant
difference between sexes for the relationship between fork
length(L;cm) and centrum radius(R;1/15mm), the equations were
estimated as follows: Male:L=2.4166+1.0439R;Female:L=2.7489+1.0
369R.(3)The von Bertalanffy growth equation for fork length(cm)
were estimated as follows:Male:Lt=54.77{1-exp[-0.1113(t+2.5909)
]};Female:Lt=65.38{1-exp[-0.0865(t+2.8151)]}.(4)There were
significant difference between sexes for the relationships
between natural logarithmic boby weight(W;g) and fork length (L;
cm), the equations were estimated as follows:Male:W=0.006822
L^3.1673 ; Female:W=0.007767L^3.1364.(5)The annulus was formed
once a year in the period from March to May.(6)Reproductive
period of female are in March-April and July-September, and
male are in February-April and August-November.(7)According to
1932 speciemens, sex ratio was 0.24, which was significant
different from 0.5 by Chi-square test, and the difference
increased with fork length or age.(8)The age composition
estimations showed that there were 7 age groups in 1994, 7 age
groups in 1995 and 6 age groups in 1996. The major catch group
appeared at age 2 in 1994,age 0 in 1995 and age 1 in 1996,
respectively.
| Identifer | oai:union.ndltd.org:TW/084NTU00453003 |
| Date | January 1996 |
| Creators | Jeng,Kuen-Jong, 鄭坤忠 |
| Contributors | Lee,Ying-Chou, 李英周 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 86 |
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