in the water quality and sediment quality analysis process,i got most mollusks(gatsropods) and the worms spp.i m about to calculate the EPT, Taxa richness,pollution tolerance index......so,is there any index based on the mollusks.
Most use of aquatic macroinvertebrate use for stream health requires a degree of sampling of various habitats such as riffles, runs, glides and pools. A stream dominated by sediment is not going to have much diversity in general, and that is why you look at some many different habitats and conditions. I would not like to sample with crocodiles, this is not worth your safety. But you might try making up some substrate sampling devices, some full of pebbles, other some flat rocks, others some leaf packs, others sediment. You make up a bunch, and get someone to take you out in a boat and then put a bamboo stick marker with heavy line to hold onto your artificial habitat. You drop these in various habitats and then return to retrieve them possibly after a few days or weeks. If you have EPT, they will colonize onto the rocks. If the samplers are buried in sediments from storm events, then that would probably limit what you catch, and your likelihood of EPT is slim, unless there are shoals (rocky, cobbly, gravelly areas). If you have to sample aquatic insects in crocodile waters, they are not going to be much of an indicator for general use. I see you have another question, so I will go to that one. Don't put yourself at undue risk, work in headwater streams where there are no crocodiles. You can see from my researchgate articles I have done a variety of hydrology type projects. The spruce budworm project that used aquatic insects in 1983 may be helpful with some other sampling. The 1984 report is old, you can tell technology has change a lot.
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