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Table 4 Insects and other organisms removed as “trash” on sitea

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

  From the four-hand netb From the grader
Class Order Family Species No. of individuals (%) Wet weight (%) No. of individuals (%) Wet weight (%)
Insects Ephemeroptera Potamanthidae   0.02 0.01
   Baetidae   0.33 0 0.5 0.01
   Ephemerellidae   29 36.67 35 46.51
   Heptageniidae   15.5 37.63 11.9 16.9
  Plecoptera Perlidae   0.16 0.6 0.15 0.9
   Taeniopterygidae   0.02 0
   Nemouridae   0.02 0
   Capniidae  
   Others   0.02 0
  Hemiptera Aphelocheiridae   0.04 0.92
  Megaloptera Corydalidae Protohermes grandis 0.02 0.02
  Trichoptera Hydropsychidae   5.33 4.94 5.23 4.65
   Stenopsychidae Stenopsyche marmorata 0.16 3.86 0.19 1.98
   Rhyacophilidae   1 0.24 1.4 1.21
   Others   0.33 0.12 0.21 0.1
  Coleoptera Elmidae   0.08 0
   Psephenidae   7.83 10.73 6.97 16.02
  Diptera    40.33 5.18 38.13 11.57
     Total: 600 Total: 8.29 g Total: 5192 Total: 74.08 g
Crustacea Amphipoda    6 0.16
Annelida Oligochaeta      1 0.01
Platyhelminthes Tubellaria    1 0.03 9 0.02
Pisces    Rhinogobius flumineus 1 0.13 2 0.49
Total debris/detritus weight (wet): 91.25 g 578.57 g (Est.)
Total weight (wet): 99.7 g 723.02 g (Est.)
Debris/detritus weight (%): 91.52 80.02 (Est.)
Insects and other organisms' weight (%): 8.47 19.97 (Est.)
  1. aUnwanted or sometimes non-visible organisms removed with inanimate matter (debris, detritus)
  2. bWe give here the results of one catch (less than 2 min of fishing). The fisherman did four catches in total (before pouring the harvest on the first sieve of the grader)