de Lara-Isassi G
Departamento de Hidrobiología, Laboratorio de Ficología Aplicada, Universidad Autónoma metropolitana-Iztapalapa, México, DF.
Food Addit Contam. 1995 May-Jun;12(3):485-90. doi: 10.1080/02652039509374334.
This research was carried out in order to show that certain substances of algal origin are toxic to animals, particularly to fish, and to determine if a relationship exists between toxicity and the latitude where the algae were collected. Twenty-nine species of algae were collected in different localities off the Pacific coast of Mexico. The samples were frozen shortly after collection and kept frozen until used. Crude ethanolic extracts of the algae were prepared and tested for ichthyotoxicity. The extracts were classified as nontoxic (NT), weakly toxic (WT) and highly toxic (with lethal effects) (T). The reactions exhibited by the fish to the presence of the algal extracts in their environment ranged from initial adaptative behaviour to death. Only four species (14%) out of the 29 algal species tested were highly toxic, 13 (45%) weakly toxic and 12 (41%) non-toxic. The high percentage of algal extracts that showed some degree of toxicity suggests that algae might have some kind of defence mechanism that could be noxious, thus being inedible by fish. The highest toxicity values were found among tropical algae. These results suggest that a relationship could exist between toxicity and the latitude of the collecting locality.
开展这项研究是为了表明某些藻类来源的物质对动物有毒，尤其是对鱼类，并确定毒性与采集藻类的纬度之间是否存在关联。在墨西哥太平洋沿岸的不同地点采集了29种藻类。样本在采集后不久即冷冻，并一直保存至使用。制备了藻类的粗乙醇提取物，并对其进行了鱼毒性测试。提取物被分类为无毒（NT）、低毒（WT）和高毒（有致死作用）（T）。鱼类对其环境中藻类提取物的反应范围从最初的适应性行为到死亡。在测试的29种藻类中，只有4种（14%）具有高毒性，13种（45%）低毒性，12种（41%）无毒。显示出一定程度毒性的藻类提取物比例很高，这表明藻类可能有一种有害的防御机制，因此鱼类无法食用。在热带藻类中发现了最高的毒性值。这些结果表明，毒性与采集地点的纬度之间可能存在关联。
