There is yet to be a unified global traits database for macroinvertebrates, though such a database is certainly needed:

Maasri, A. (2019). A Global and Unified Trait Database for Aquatic Macroinvertebrates: The Missing Piece in a Global Approach. Frontiers in Environmental Science, 7, 65.

That said, you can usually find information on most taxa by stitching together information across databases, which are usually regionally specific. The paper below lists several of these resources:

Kefford, B. J., Botwe, P. K., Brooks, A. J., Kunz, S., Marchant, R., Maxwell, S., ... & Thompson, R. M. (2020). An integrated database of stream macroinvertebrate traits for Australia: concept and application. Ecological Indicators, 114, 106280.

Additionally, the EPA has a really good traits database: https://www.epa.gov/risk/freshwater-biological-traits-database-traits

And here is a good EU resource for macroinvertebrates traits: https://www.freshwaterecology.info/

I hope this helps!

There is yet a open access database of macroinvertebrates traits in China until now. but there have some scientist did a lot work in this filed, You can find deatail information as follow:

Beixin Wang

Xiaodong Qu

Hongzhu Wang

Zhicai Xie

Freshwaterecology.info provides a robust combination of traits for European inland biotas, including macroinvertebrates.

https://www.freshwaterecology.info

Best,

Jorge

Considering marine and estuarine macroinvertebrates, maybe you can find some traits for some species here:

SealifeBase: https://www.sealifebase.ca/

BIOTIC: http://www.marlin.ac.uk/biotic/biotic.php

Polychaetes: http://polytraits.lifewatchgreece.eu/

best regards,

Ivan

You can read this paper

https://www.fisheriesjournal.com/archives/2020/vol8issue5/PartB/8-4-68-114.pdf