Morphometric Studies of the Grey Mullet(Mugil Cephalus)from the Waters Around Taiwan

臺灣海域產烏魚(Mugil cephalus)形態測定之研究

陳文義(Wen-Yei Chen) ； 蘇偉成(Wei-Cheng Su) ； 邵廣昭(Kwang-Tsao Shao) ； 林介屏(Chieh-Pin Lin)

《臺灣水產學會刊》 16卷3期 (1989/10) Pp. 153-163

https://doi.org/10.29822/JFST.198910.0001

摘要

為探討光照强度與餌料密度對仔稚魚之攝食的影響，本實驗利用三種光照强度（1000-3000 lux，100-300 lux及1 lux以下），配合三種餌料密度（5，10，15/ml之輪蟲或0.01，0.1，1/ml之豐年蝦），分別投餵不同發育階段之黄錫鯛(Sparus sarba)之仔稚魚（L0，剛開始攝食者；L1，1個月大者；L2，2個月大者），並以餌料捕食(prey-capture)及餌料消耗(prey-consumption)分別評估其影響。實驗結果顯示，任一不同餌料密度之投餵下，三種光强度對早期仔稚魚（L0及L1）之餌料捕食或飼料消耗均呈現顯著作用，且高照度均有助益攝食；唯較晚期仔稚魚（L2），光照强度僅對其餌料消耗顯示促進作用，對其餌料捕食未呈現顯著影響，唯過低之餌料密度，光照强度則無法促進餌料消耗，故未顯示光照之作用。因此，黄錫鯛三個階段之仔稚魚之餌料捕食與餌料消耗，所承受之環境光照與餌料密度之影響不同，早期仔稚魚仰賴光照强度及餌料密度之影響，呈現典型海水仔稚魚之視覺索餌(visual feeding)之特性，待成長至L2仔稚魚，可能其他感覺與攝食器官之發育，光照强度及餌料密度則顯現較複雜之作用；故尋求適切之仔稚魚培育條件應慮及其發育階段之差異性。

關鍵字

烏魚 ； Mugil cephalus ； 形態測定 ； 族羣判別

並列摘要

In order to obtain a better rearing condition,the effects of different lightintensities(1000-3000 lux,100-300 lux and under 1lux)and prey densities(5,10,15 rotiferas/ml and 0.01,0.1,1 brine shrimps/ml)on the feeding rate of silverbream larvae(Sparus sarba)at different stages(L0,start feeding larvae;L1,1-monthold;L2,2-month-old)were examined.Feeding rate was evaluated bythe capacity of both prey-capture(FR1)and prey-consumption(FR2).L0 andL1 larvae showed the significant difference in prey capture and prey consumption under the three different light intensities and prey densities.L2 larvaedid have neither the different prey capture under the various light intensitiesand prey densities,nor the different prey consumption and at the lowestprey density.However,in the case of the lowest density of prey,the olderlarvae did not show different prey-consumption at different light intensities.In addition,these growing larvae demonstrate the significant prey-consumptionat different light intensities if the prey was sufficiently offered.

並列關鍵字

Grey Mullet ； Mugil Cephalus ； Morphometric ； Population Discrimination