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Effects of heavy metal ions on larval Penaeus chinensis and comparative study on their elimination methods

Acta Oceanologica Sinica 1993年第2期12卷 285-293页

作者： yuan youxian, gao chengnian and zhang duxi yellow sea fisheries research institute, chinese academy of fishery sciences, qingdao 266071, china

In order to establish a new method to eliminate toxicities of heavy metal ions to larval penaeid shrimp, the effects of copper, zinc, lead and cadmium ions on larval metamorphosis of Penaeus chinensis at each stage were determined in detail, and two methods eliminating toxicities were compared. The results indicate that sensitivity of larvae to heavy metal ions decreases in the order of nauplii, protozoea, mysis and postlarvae. The phytoplankton food can reduce, by chetating, the toxicities of heavy metal ions. Both EDTA chelation and PHMA absorption can be used to eliminate the toxicities effectively and there is no significant difference between the two methods. EDTA is harmful to larval P. chinensis at high concentration but affects neither survival nor metamorphosis at below 10 mg/dm3. It is preliminarily observed that copper and zinc ions at low concentration are beneficial to the development of larvae after protozoea stage. It is suggested that it is unnecessary to e-liminate the effects of heavy metal ions in the culture of penaeid shrimp, under normal conditions after protozoea stage.

关键词： Larval Penaeus chinensis copper zinc lead cadmium EDTA polymeric absorbent

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sea　water　environment　copper　requirement　of　egg　hatching　and　naupliar　metamorphosis　of　Peaneus　chinensis

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Acta Oceanologica Sinica 1995年第3期14卷 421-428页

作者： yuan youxian Qu Keming Liu Libo gao chengnian and zhang duxi(yellow sea fisheries research institute, chinese academy of fishery sciences, qingdao 266071, china)(Jimo fisheries Bureau, Jimo 266200, china)

A new method was used to remove heavy metals in sea water. The requirement of copper in sea water ofegg hatching and naupliar metamorphosis of Penaeus chinensis was investored. A certain amount of copper ion andchelator nitrilotriacetic acid (NTA) were added in the de-heavy-metal-ionized sea water and then the cupric ion actvitywas calculated. The effects of copper ion on egg hatching and naupliar metamorphosis were observed. It was firstfound by experiments that trace ionic copper (10-10.80-10-8.80 mol/dm3) was essential to the growth and development of egg and nauplii of penaeid shrimp and chelated copper had no actions for these living processes,but in highconcentrations (>10 -7.80 mol/dm3) ionic copper was toxic. The nauplii were more sensitive to necessity and tokicityof ionic copper than eggs.

关键词： Egg hatching copper ion Penaeus chinensis,naupliar metamorphosis

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