Processing insect abundance: trading and fishing of zazamushi in Central Japan (Nagano Prefecture, Honshū Island)

Table 3 Insects escaping from the four-hand net^a

Class	Order	Family	Species	No. of individuals (%)	Wet weight (%)
Insects	Ephemeroptera	Potamanthidae		−	−
		Baetidae		0.4	0.05
		Ephemerellidae		12.5	27.2
		Heptageniidae		4.8	6.8
	Plecoptera	Perlidae		0.04	0.5
		Taeniopterygidae		−	−
		Nemouridae		0.1	0
		Capniidae		0.1	0.05
		Others		0.3	0.05
	Hemiptera	Aphelocheiridae		−	−
	Megaloptera	Corydalidae	Protohermes grandis	−	−
	Trichoptera	Hydropsychidae		7.1	13.2
		Stenopsychidae	Stenopsyche marmorata	0.2^b	6
		Rhyacophilidae		1.4	1.8
		Others		0.04	0.05
	Coleoptera	Elmidae		0.04	0
		Psephenidae		3.7	11.1
	Diptera			69.5 (Est.)	33 (Est.)
				Total: 2269	Total: 18.7 g
Crustacea	Amphipoda			−	−
Annelida	Oligochaeta			−	−
Platyhelminthes	Tubellaria			−	−
Pisces			Rhinogobius flumineus	−	−

^aThe fishing session lasted 9 min in total. The fisherman prospected the riverbed one meter and half away from the four-hand net. Insects were caught behind the four-hand net with a seine net (size: 400 cm (long), 70 cm (high), 1 mm (mesh size). Insects escaped from both sizes on 20 cm
^bAll instars are of stage 5