摘要
本文根据1985—1988年浙江南几泥底质海区人工鱼礁试验资科,表明对于海底70厘米以下质土允许承载力4.6吨/米~2以上的泥底质,投放9.0×4.4×4.5米~3钢筋混凝土制礁体,其沉陷主要在投礁后一星期内。之后沉陷率急剧减少,二年后不再下沉,有效高度保持在2.2—2.3米。在礁区礁体有效空体积345米~3,礁场面积6770米~2规模下,投礁后三个月见效。一年后,生态环境明显改善,延绳钓、流刺网渔获量分别稳定在投礁前的2.55—4.20倍与3.80—4.55倍,是天然礁区的1.12—2.04倍,自然海区的1.46—9.75倍,天然礁区常见的以及未见的岩礁性鱼类在人工礁区出现,并有性腺发育达到Ⅳ期的个体,呈现出显著的增殖和增产效果。
Based on experiments performed in 1958-1988 on the effectiveness of artificial fish reefs in the sea area of Nanji,an island in the southern part of Zhejiang Province,the author found that the boat type reef bodies,built of reinforced concrete and emplaced on the open muddy bottom,sank mainly during the first week.Afterwards,the sinking rate of the reefs decreased rapidly,and it stopped sinking after 2 years,maintaining an effective height of 2.2—2.3 meters above the sea bottom.After the artificial reefs were pla- ced,the structure of the substrate changed markedly,benthic and fouling organisms colonized profusely and economic fishes eventually increased.After 6 months,the longline catch increased by 2.55—4.20 times and the drift net catchby 3.8—4.55 times.By the end of 3 years,the number of fish species had increased notably.The author also found that 70—100%of the fishes were caught within 25—30 meters around the reef bodies.
