|Abstract: ||本研究針對臺灣東北部龜山島海域產日本發光鯛(Acropoma japonicum )之漁業生物學進行研究。採樣期間從2008年9月至2009年9月止，共計採得樣本3027尾，含雄魚1451尾，雌魚1174尾，以及無法辨識性別之個體402尾。樣本尾叉長範圍在3.0-17.4.cm，體重在0.51-90.90.g間。本種體長 (FL) 體重 (BW) 關係式經檢定後無顯著差異，可以 表示。本種產卵期在4-11月間，最小性成熟體長(FL)雌魚為6.2.cm、雄魚為6.4.cm左右；孕卵數在5,900- 66,902粒之間，平均為 14,703 ± 1,376 粒 (n=50)，而產卵數約在2,827- 15,530粒之間，平均為 5,873 ± 594 粒 (n=22)。本種性比除9、10及12月外，其餘月份與50%並無顯著性差異，但全年之性比則與50%呈顯著差異。本種無論雌雄肥滿度指數季節變化均不明顯，但約略可見產卵期間相對較高而其他月份較低的情形；肝臟指數雌魚變化亦不大，但雄魚則於產卵期間明顯下降。而內臟指數則於5-9月間較低，12-4月間相對較高。此等週期變化顯示，本種生殖期間主要能量可能來自肝臟與內臟，且雄魚的能量消耗可能高於雌魚。本種雌及雄魚之輪紋數最高可讀至5及4輪，最小性成熟年齡雌魚為1.21歲，雄魚則為1.11歲。而非線性法所估算而得之von Bertalanffy成長方程式，以尾叉長(cm)表示為Lt =29.71(1-e-0.0867 (t+1.5866) )；而以體重表示則為Wt = 473.52 (1 - e -0.0867 ( t + 1.5866 ) ) 3.029 。本種之年齡結構雌雄皆以2至3歲魚為主，雄性 1歲魚佔7.33%，2歲魚佔58.67%，3歲魚佔30.33%，4歲魚佔3.67%，而雌性之 1歲魚佔10.00%，2歲魚佔38.67%，3歲魚佔37.67%，4歲魚佔11.67%，而5歲魚則僅佔2.00%。|
Fisheries biology of Acropoma japonicum in surrounding waters of Guei-San Island, northeastern Taiwan were examined based on samples collected from Sept. 2008 to Sept. 2009., In total, 3027 samples including 1451 females, and 1147 males, as well as 402 undifferentiated individuals were obtained. Size of samples ranged from 3.0 to 17.4 cm in fork length, and 0.51 to 90.9 g in weight. There was no difference found in body weight-fork length relationships for both sexes. The combine equation is . The spawning season of A. japonicum was from Apr. to Nov.. The size at first maturity for female was 6.2 cm, and was 6.4 cm for male. The fecundity estimated ranged from 5,900 to 66,902, and averaged at 14,703 ± 1,376 (n=50), while the batch fecundity was estimated to be from 2,827 to 15,530 (n=22), with an average of 5,873 ± 594. There were no differences found in sex ratio of 50 percentage for most months except for Sept. Oct. and Dec.. Seasonal changes in condition factor (CF) of the species were less evident for both sexes, and showed relative higher only in the spawning season. The seasonal variation in hepatosomatic index (HSI) for female fish also was not evident, but it was significantly lower during the spawning season for male fish. The Visceral Index (VI) for both sexes also were lower between May and Sept., and higher from Dec. to Apr.. These patterns Indicated that energy required for spawning of the species may mainly derived from visceral and liver, and male fish may spend more energy for spawning than female. The maximum ages for female and male fishes were estimated to be about 5 and 4, respectively. The age at first maturity for female was 1.21, and was 1.11 for male. The von Bertalanffy growth equations derived from non-liner method were Lt =29.71(1-e-0.0867 (t+1.5866) ) in length, Wt = 473.52 (1 - e -0.0867 ( t + 1.5866 ) ) 3.029 in weight. The population for female and male was dominated by ages 2 to 3 individuals, with percentage of 7.33%，58.67% and 30.33%, in each of the age classes for male, and 10.00%，38.67% and 37.67% in each of the age classes for female. Male fish older than age 4 was only 3.67%, and 13.67% for female.