碩士 / 國立師範大學 / 生物學研究所 / 81 / The research was conducted in Ha-Pen Nature Reserve
from Feburary, 1992 to April, 1993. The purpose of this
study is to investigate the population structure, sexual
differences, habitat use, and reproduction biology of
Zacco barbata, an endemic freshwater fish of Taiwan.
After more than one year survey, the result showed
that the sex ratio of Zacco barbata was significatly
different from 1: 1. The sexual dimorphism in larger Zacco
barbata could be distinguished by their secondary sexual
characters, which include the pearl organs locating on
heads and anal fins, and the breeding color on their
lateral sides. Generally speaking, males are larger than
females in average total length. However, the smallest
sexually mature males and females are 75 mm and 79 mm,
respectively.
From GSI (gonadosomatic index) data, development of
gonads and distribution frequencies of egg diameter, we
found out that the breeding season of Zacco barbata in
Ha-Pen Creek was from April to October in 1992, and the
peak of breeding season from April to July. Based on the
development of eggs in ovary, we could tell that females
of Z. Barbata have multiple spawning.
Female with longer total length usually had
heavier ovary is due to containing more eggs instead of
bigger eggs. We suspected that the relative energy input
to the breeding effort in smaller females were about the
same as that of larger ones.
The suitable habitat for Zacco barbata was stream
with low velocity, where had good vegetation coverage on
both sides for hideouts, and the sediment is minimal. The
population density varied with seasons, higher in summer
than in winter. There were also significant difference in
population size among the four study stations.
| Identifer | oai:union.ndltd.org:TW/081NTNU0112005 |
| Date | January 1993 |
| Creators | Chung-Shung Yen, 顏俊雄 |
| Contributors | Kuang-Yang Lue, 呂光洋 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 38 |
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