问题:我国渔业水质标准中规定溶解氧含量连续24h中,16小时以上必须大...
Monday, September 12, 2022
问题:网箱养鱼遇到水温急剧下降、阴天无风、溶氧量降低时,投饵量应()或...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 2022
Monday, September 12, 2022
Thursday, September 15, 2022
Friday, September 16, 2022
问题:池塘中最大的耗氧因子是鱼类及其它水生动物的()。...
Friday, September 16, 2022
问题:80:20池塘养殖技术中,()%的鱼产量来源于摄食人工颗料饲料的...
Thursday, September 15, 2022
Friday, September 16, 2022
Monday, September 12, 2022
问题:鲫鱼的口腔里没有(),在咽部有(),食物在此压碎,经()到()。...
Monday, September 12, 2022
Monday, September 12, 2022
Monday, April 24, 2023
Monday, April 24, 2023
Monday, September 12, 2022
Friday, September 16, 2022
Saturday, December 2, 2023
Sunday, September 11, 2022
问题:鱼苗孵化设施的种类很多,传统的孵化设施主要有()、和()等,也有()和()等新型孵化设施系统。...
Wednesday, April 26, 2023