Monitoring of the Gonad of Rabbitfish Siganus guttatus in an Oil Spill -Affected and Unaffected Area
スポンサーリンク
概要
- 論文の詳細を見る
Gonad development of rabbitfish Siganus guttatus from an oil spill affected (Taklong Island) and unaffected (Ave Maria Sanctuary)area in Guimaras province were monitored from November 2007 to December 2008. There were instances wherein samples couldnot be collected in both sites at the same period since tidal change was not abrupt so that the fish did not migrate to the seagrass bed where they fed and eventually get caught in the barrier net. Male rabbitfishes sampled from both area had 23-400 g body weight(BW) and 6.15-29.00 cm total length (TL) while females had 25-753 g BW and 6.50-31 cm TL. The fish were dissected and gonadswere preserved in Bouin’s solution. The left lobe of the gonad was used for histological procedures. Due to limitations in measuringthe gonad weight in the site, the gonads were weighed after being preserved for several months. The range of the gonadosomatic index (GSI) of the males in Taklong Is. was 0.02-8.39 and 0.04-3.25 in the Ave Maria Sanctuary. Male GSI in Taklong was lower inMay and June, higher from July to November but the same in December. For the females, GSI range was 0.1-7.78 in Taklong Is. and0.03-1.68 in Ave Maria Sanctuary. Female GSI in Taklong was lower in June and December, the same in July but was higher in Augustand November. Results in the GSI did not seem to show a clear difference between the oil spill affected and unaffected area. Acomparison of the maturity stages of the testes and ovaries of sampled fish from both areas also showed no distinct difference between the oil spill affected and unaffected area. These results indicate that more than a year after the oil spill incident, gonad development of S. guttatus were already not affected.
- 2010-07-26
論文 | ランダム
- 建築現場労働者の作業能率に関する研究 : 第1報・医用テレメーターによる生体現象の測定 : 建築経済・住宅問題
- 建築生産方式の工業化に関する研究 第一報 : PC版製造工場における作業の実態調査 (その1)
- 資料(400米水槽25年の歩み)
- 699 G. T. 型内航タンカーの船型改良に関する研究
- 高経済性内航船舶の船型開発に関する研究(推進性能部,所外発表論文等概要)