A great number of experiman.ts were carried out in I984 and I985 in testing the newly designed fishing gear for alternate fishing recruitment in eight kinds of ponds and weirs in aquaculture station, animal husbandry station, Young People station and Hue thong Agricultural University.The results are summarized as follows: 1.The cubic number coefficient(K₂)of silver carp, grass carp and bighead carp is 6.36，5.50 and 6.40 respectively. 2.Trinal pulling gill net and reformatory shore landing seine are new fishing gear far alternate fishing-recruitment in ponds and weirs. Their mesh size applies directly weight eduation(a=K₂G^1/3) and not decreasing 20-50% any more. 3.When web sine (2a) are designed as 10 cm, fishing sine of silver carp, big-head carp are aver 500 gram. 4.Fishing size were not selected by fisherman and fish remained in ponds grew very goad. 5. Output per ha pond may increase by l0% more. 6.The quality of the new fishing gear are light, simple and lower cost. 7.These fishing gear ma.y be applied to all ponds and weirs over the country.