碩士 / 國立高雄海洋科技大學 / 漁業生產與管理研究所 / 94 / The age and growth of the myctophids Benthoscopelus pterotum were investigated by examining the rings of otolith and length-frequency data of fish collected from the coastal waters off southwestern Taiwan. To describe the age and growth using seasonalized von Bertalanffy growth equation (VBGE) estimated from Electronic Length Frequency Analysis (ELEFAN), the length-frequency data of 24,475 specimens were examined on a monthly basis during August 2003-October 2004 from the landings by Tungkang shrimp otter trawlers. During November 2004 to December 2005, 162 specimens were also examined to obtain the relationship between the growth increments of otoliths and body length.
Parameters of the von Bertalanffy growth equation with seasonal fluctuations were estimated as asymptotic length (L∞) =58.35 mm; growth coefficient (K) =1.15 yr-1; amplitude of growth oscillation (C) =0.60; winter point (WP) =0.16. The total mortality coefficient, Z estimated by using of the length-converted catch curve was 5.23 yr-1. The longevity tmax approached to 3 years old.
As for the otolith character of this species, the number of ring increased with the otolith radius, and the otolith weight and otolith radius increment also increased with the individuals’ growth. These results suggested that the otolith of this species is a good character of age-determination. Based on the results of this study and the findings of other studies, the periodical rings of otolith should be not a daily growth mark. The periodicity of ring formation was discussed in detail in this study.
| Identifer | oai:union.ndltd.org:TW/094NKIMT451006 |
| Date | January 2006 |
| Creators | chen kai-wei, 陳凱暐 |
| Contributors | Chiou Wann-Duen, 邱萬敦 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 107 |
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