碩士 / 國立嘉義大學 / 水生生物科學系研究所 / 103 / Crown conch (Hemifusus tuba) is a popular seafood in Taiwan, its population decreased cause by overfishing. Reproductive biology of the crown conch is not yet studied in Taiwan. The researcher used Gonad Somatic Index(GSI) and microscopic examination to understand breeding features and embryo developments of crown conch in nature habitats.
From 2013, Dec. to 2014, Nov. the researcher collected 378 crown conch from sampling area (197 are female and 181 are male). According to the records, female conches were significantly larger than male in shell length and without difference on morphology of shell. However, the number of female conch was significant larger than male. From soft-body/ shell ratio data, larger numbers were found during Dec. to Jan. and the conch contain larger soft body proportion in winter in generally. By analyzing GSI and soft-bodies ratio, breeding season of crown conch happens during December~ March and spawning season was found at January~ March in 2013. The minimum length of sexually maturation was 99.684 cm in female and 88.515 cm in male.
The researcher also found that, through the observation of histological sections, the way of crown conch’s egg cleavage is similar to Cephalopoda, belong to incomplete cleavage. Through histological observation, every single eggs in capsule were fertilized and with no difference in size. And its embryo intake nurse eggs in trochophore stage and dose not feed while veliger larva stage. Veliger larva contained an nurse egg sac to utilize nutrients of nurse egg which intake and stored inside sac during trochophore stage.
| Identifer | oai:union.ndltd.org:TW/103NCYU5061006 |
| Creators | 詹少君 |
| Contributors | , 郭世榮, 董哲煌 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 87 |
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