Harmful Algal Blooms (HABs) are most likely to occur during the peak summer months. Sample collection is best done during daylight hours, between 8 a.m. and 6 p.m. Your samples should be kept chilled and in the dark at all times after collection. You should ship your samples as soon as possible and no more than 24 hours after collection. Samples should be shipped overnight to reduce the risk of sample deterioration.