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題名 | Reproductive Biology of the Yellow Seabream (Dentex Tumifrons) in the Northern Waters off Taiwan=臺灣東北部海域赤鯮(Dentex Tumifrons)之生殖生物學 |
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作者姓名(中文) | 廖正信; 彭敏; 秦韶生; 蘇偉成; | 書刊名 | 臺灣水產學會刊 |
卷期 | 36:4 2009.12[民98.12] |
頁次 | 頁233-250 |
分類號 | 387.1016 |
關鍵詞 | 赤鯮; 生殖生物學; 臺灣東北部海域; Yellow seabream; Dentex tumifrons; Reproductive biology; Northern Taiwan; |
語文 | 英文(English) |
中文摘要 | 赤(魚宗)(Dentex tumifrons)為台灣東北部海域高經濟價值之底棲性魚種之一,為探究其生殖生物學之特性,本研究於2005年8月至2006年8月間,按月於金山、瑞芳及大溪漁港,隨機採集底拖網漁業所捕獲之赤(魚宗)樣本共計1,400尾。由月別生殖腺指數(GSI)、肥滿度係數(CF)及組織切片之結果顯示,台灣東北部海域之赤(魚宗)為多次生殖且分批不同步成熟之魚種,其生殖高峰期約為每年4月及10月。而由組織切片觀察之結果發現,卵細胞之發育過程可概分為未成熟期、成熟早期、成熟後期、完熟期、退化期5個時期,其中又可細分為週邊核仁期、卵黃胞期、初級卵黃球期、次級卵黃球期、三級卵黃球期、胚胞移動期、完熟期及退化期八個階段。此外,雌魚數佔總魚數的性比為0.704,經卡方檢定顯示與0.5有顯著不同,同時性比有隨著尾叉長之增加而逐漸減小趨勢。而赤(魚宗)孕卵數(F)與生殖腺重(GW)之迴歸關係為F = 11.56GW + 8.0745 (n = 25, P < 0.05),估計其平均孕卵數為50151± 30379粒。再者,由logistic曲線所估計之雌雄別50% 性成熟尾叉長,分別為149.3 mm及169.0 mm。 |
英文摘要 | Reproductive biology of the yellow seabream (Dentex tumifrons) was described based on 1,400 specimens caught by otter trawlers in the northern waters off Taiwan and landed at Jinshan, Rueifang, and Dasi fishing ports from August 2005 to August 2006. Macroscopic appearance of the ovary, gonadosomatic index, and histological examination suggested that the yellow seabream spawns asynchronously, and spawning peaks in April and October, in the northern waters off Taiwan. Eight stages of oocyte development were determined based on histological examination, and ovarian development can be divided into immature, early maturing, late maturing and matured stages. The sex ratio of 0.704 was significantly different from 0.5 using χ2 test and decreased in compliance with the increasing of fork length in bigger specimens. The relationship between fecundity (F) and gonad weight (GW) was estimated to be F = 11.56 GW + 8.0745 (n = 25, P < 0.05). Mean fecundity (± standard deviation) was estimated at 50151 ± 30379 eggs. Size of fork length (FL) at 50% maturity estimated by using the Logistic model was 154.8 mm and 168.6 mm for females and males, respectively. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。