Journal
MARINE POLLUTION BULLETIN
Volume 62, Issue 8, Pages 1809-1813Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2011.05.011
Keywords
Mugil cephalus; Fish kill; Otolith; Elemental composition; Tanshui River
Funding
- National Science Council [NSC982621B006001]
- National Museum of Marine Biology and Aquarium, Taiwan, ROC [NMMBA992003511]
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A massive fish kill of approximately 50 tons of flathead grey mullet (Mugil cephalus) occurred in August 2006 in the Tanshui River, northern Taiwan. To clarify the origin of these mullets, 42 individuals were randomly collected to determine their ages by reading otolith annuli and to measure the trace elements in the otolith. The total lengths of the fish averaged 32.7 +/- 4.4 cm, and most of the individuals were 2 years old, indicating that the mullets in the mass fish kill event were in the immature and growth stages. The Sr/Ca and Ba/Ca ratios of a subsample of 14 otoliths showed that half of the fish killed were estuarine residents, and the rest originated from marine and freshwater habitats. The multiple causes involved in this fish kill implied that additional unknown factors influenced the mullet populations on a large scale and induced them to move quickly and gather at this estuary. (C) 2011 Elsevier Ltd. All rights reserved.
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