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蓄养池内产卵、孵化的幼体选优

发布日期:2017-11-22     浏览次数:9432
核心提示:选优后需移池、分池培育,主要方法有虹吸、浓缩、拖网3种。移池和分池前要计数,方法是上下轻轻搅动水体,使幼体在池内分布相对均匀,用直径2厘米的塑料管在池子的不同部位垂直取样5~8次,测定单位水体内幼体数量,求得的平均值即是蓄养池内健壮幼体数量。(1)虹吸法。利用水位差的压力,用虹吸的方法将幼体由孵化池虹吸到培育池。虹吸时培育池的水面要低于孵化池,虹吸前培育池内应注人少量过滤海水(深5~10厘米),以避免幼体进人培育池时受冲击而致伤。选育前应观察幼体是否集中,如幼体较分散则不宜采用这种方法。在虹吸前应沿池壁四

XUANYOUHOUXUYICHI、FENCHIPEIYU,ZHUYAOFANGFAYOUHONGXI、NONGSUO、TUOWANG3ZHONG。YICHIHEFENCHIQIANYAOJISHU,FANGFASHISHANGXIAQINGQINGJIAODONGSHUITI,SHIYOUTIZAICHINEIFENBUXIANGDUIJUNYUN,YONGZHIJING2LIMIDESULIAOGUANZAICHIZIDEBUTONGBUWEICHUIZHIQUYANG5~8CI,CEDINGDANWEISHUITINEIYOUTISHULIANG,QIUDEDEPINGJUNZHIJISHIXUYANGCHINEIJIANZHUANGYOUTISHULIANG。

(1)HONGXIFA。LIYONGSHUIWEICHADEYALI,YONGHONGXIDEFANGFAJIANGYOUTIYOUFUHUACHIHONGXIDAOPEIYUCHI。HONGXISHIPEIYUCHIDESHUIMIANYAODIYUFUHUACHI,HONGXIQIANPEIYUCHINEIYINGZHURENSHAOLIANGGUOLVHAISHUI(SHEN5~10LIMI),YIBIMIANYOUTIJINRENPEIYUCHISHISHOUCHONGJIERZHISHANG。XUANYUQIANYINGGUANCHAYOUTISHIFOUJIZHONG,RUYOUTIJIAOFENSANZEBUYICAIYONGZHEIZHONGFANGFA。ZAIHONGXIQIANYINGYANCHIBISIZHOUZAISHUIMIANSHANGQINGQINGHUADONGYIQUAN,YISHIJINCHIBIDEYOUTIQUNYISAN,BIMIANHONGXISHIYINSHUIWEIXIAJIANG,YOUTITIEBIGANSI。

(2)NONGSUOFA。JIANGYOUTIYONGHONGXIDEFANGFAXIRENWANGXIANG。NONGSUOYONGWANGXIANGYIBANZUOCHENGYUANTONGXING,SHANGBIANKEYONGXIFANBUZUOBIAN,SHANG、XIADUANXIZAISHIXIANANWANGXIANGDAXIAOZHICHENGDEZHUJIASHANG。SHIYONGSHIKEJIANGWANGXIANGFANGRENTANGCITONGHUOQITARONGQIZHONG,DANWANGXIANGDESHANGYANYINGGAOYUTONGDESHANGYAN,YIMIANYOUTISUISHUILIUYICHU。WANGXIANGDEDAXIAOKEGENJUJUTIDEQINGKUANGLINGHUOZHANGWO,DANYIDINGYAOZHUYIWANGYANDUIJIAOXIANYINGXIAOYUYOUTIDEKUANDU,YIMIANYOUTILOUCHU,YIBANKEYIYONG⒛0MUDESHAIJUAN。YONGWANGXIANGNONGSUOSHISHUILIUSUDUBUNENGTAIJITAIKUAI,YIMIANYINJIYACHONGJIERSUNSHANGYOUTI。ZAINONGSUOGUOCHENGZHONGYINGBUDUANDOUDONGWANGXIANG,YIMIANYOUTIDALIANGTIEWANGSHOUDAOSUNSHANG。DANGYOUTIZAIWANGXIANGZHONGJIZHONGDAOYIDINGSHULIANGHOU,JISHIJIANGYOUTIYAOCHUTOURENPEIYUCHI,YIMIANYINNONGSUODEYOUTIMIDUGUODADUIJIYUWANGDIERSHOUSHANG。YONGZHEIZHONGFANGFAJINXINGXUANYU,SUIRANKESUNSHANGXIEYOUTI,DANSHIBIMIANLEJIANGYUANFUHUACHIZHONGDEBUJIEJINGHAISHUIDALIANGDAIRENPEIYUCHI,BAOZHENGLEPEIYUCHIDESHUIZHIQINGXIN,YOULIYUYOUTIDEZHENGCHANGFAYU。

大发棋牌下载(3)TUOWANGFA。DANGFUHUACHUDEYOUTIMIJIYUSHUIDESHANG、ZHONGCENGSHI,KEYONGTEZHIDEZHANGYUFUHUACHIDEKUANDUXIANGDANG,KUAN、GAOJUNWEI40LIMIZUOYOUDEZHANGFANGXINGWANGXIANG,JIANGYOUTIBULAODAOPEIYUCHIYIDUAN(WANGXIANGSHAIJUANGONGBANCAIYONGNX79HAOHUO200MUSHAIJUAN)。JUTIDECAOZUOSHI,YONGWANGZAICHISHUIBIAOCENGTUOHUOTUI,DONGZUOYAOQINGHUAN。DAIYOUTIMIJIDAOWANGZHONG,JIANGWANGKOUQINGQINGTIQI,WANGKOUSHAOLISHUIMIAN,WANGDIBUYAOLIKAISHUIMIAN,RANHOUJIANGWANGZHONGJIZHONGDEYOUTIDAISHUIYAOCHUZHUANGRENYUXIANBEIHAODESHUICAOZHONG。ZHEIYANGKEFANFUTUO2~3CI,DAIYOUTIZHONGXINJIZHONGHOUZAITUO,RUCIFANFUDUOCI。JIZHONGYUSHUICAOZHONGDEYOUTIJISHUHOU,ANZHAOXUYAOJIANGYOUTIFENBUDAOGEGEPEIYUCHIZHONGJINXINGPEIYU:ZHEIYICAOZUOFANGFAJIANBIAN,KEYIJIAOKUAIDIJIANGDABUFENYOUTIXUANCHUBINGJIZHONG,YEYIYUDINGLIANG。

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