筆者根據調查分析認為,造成海參病害暴發和蔓延的主要原因:一(yi)是(shi)不(bu)重(zhong)視(shi)清(qing)淤(yu)或(huo)清(qing)淤(yu)不(bu)徹(che)底(di),導(dao)致(zhi)水(shui)質(zhi)惡(e)化(hua)。有(you)很(hen)多(duo)刺(ci)參(can)養(yang)殖(zhi)池(chi)養(yang)殖(zhi)多(duo)年(nian)不(bu)清(qing)淤(yu),使(shi)池(chi)底(di)和(he)礁(jiao)石(shi)上(shang)堆(dui)積(ji)很(hen)深(shen)的(de)海(hai)參(can)糞(fen)便(bian)。淤(yu)泥(ni)和(he)雜(za)藻(zao),尤(you)其(qi)是(shi)池(chi)底(di)的(de)低(di)溫(wen)藻(zao)類(lei),經(jing)過(guo)冬(dong)、夏兩季開始腐爛變質,從而滋生細菌、黴菌、jishengchongdengduozhongbingjun,daozhihaicanfabing。youdecanchisuijinxingleqingyu,danshi,youyucaiquchuantongdefangengrishaidechulifangfa,genbenbunengchedijiejuechididewuranwenti,tebieshinaxiebachidiwunituizhichibian、bapodezuofagengshibushiyide。dangqingyuhou,zainashui,zhexiedinirengyaojinpaoyushuizhong,renghuibaihuaishuizhi,zishengbingjunjijishengchong,daozhihaicanfabing。ershibuzhongshicanchiyongshuidezijingjixiaodujishu。youyushouhuanjingwuran,zaijinhaideqianhaididai,tebieshizaiyanhaichengzhenfujindehaikou、內(nei)灣(wan)都(dou)受(shou)到(dao)不(bu)同(tong)程(cheng)度(du)的(de)有(you)機(ji)汙(wu)染(ran)。另(ling)外(wai),隨(sui)著(zhe)海(hai)水(shui)集(ji)約(yue)化(hua)養(yang)殖(zhi)的(de)迅(xun)速(su)發(fa)展(zhan),養(yang)殖(zhi)業(ye)的(de)自(zi)身(shen)汙(wu)染(ran)也(ye)日(ri)趨(qu)嚴(yan)重(zhong),大(da)量(liang)自(zi)身(shen)更(geng)換(huan)的(de)養(yang)殖(zhi)用(yong)水(shui)被(bei)排(pai)出(chu)後(hou),往(wang)往(wang)與(yu)汙(wu)染(ran)的(de)沿(yan)岸(an)水(shui)一(yi)起(qi)又(you)被(bei)抽(chou)回(hui)養(yang)參(can)池(chi)中(zhong),形(xing)成(cheng)大(da)量(liang)的(de)有(you)機(ji)物(wu)等(deng)進(jin)入(ru)參(can)池(chi),成(cheng)為(wei)各(ge)種(zhong)細(xi)菌(jun)及(ji)寄(ji)生(sheng)蟲(chong)等(deng)良(liang)好(hao)的(de)養(yang)料(liao),促(cu)進(jin)其(qi)大(da)量(liang)滋(zi)長(chang)和(he)繁(fan)殖(zhi)。即(ji)便(bian)進(jin)行(xing)大(da)量(liang)的(de)水(shui)體(ti)交(jiao)換(huan)也(ye)無(wu)濟(ji)於(yu)事(shi),因(yin)為(wei)外(wai)海(hai)根(gen)本(ben)就(jiu)沒(mei)有(you)潔(jie)淨(jing)水(shui)源(yuan)來(lai)調(tiao)節(jie)養(yang)參(can)池(chi)水(shui)質(zhi)。而(er)恰(qia)恰(qia)許(xu)多(duo)養(yang)參(can)戶(hu)往(wang)往(wang)隻(zhi)重(zhong)視(shi)表(biao)麵(mian)的(de)池(chi)水(shui)水(shui)質(zhi)調(tiao)控(kong),而(er)忽(hu)略(lve)了(le)底(di)泥(ni)對(dui)水(shui)環(huan)境(jing)的(de)影(ying)響(xiang)及(ji)環(huan)境(jing)汙(wu)染(ran)所(suo)造(zao)成(cheng)的(de)惡(e)果(guo),缺(que)乏(fa)漁(yu)用(yong)水(shui)的(de)自(zi)淨(jing)及(ji)消(xiao)毒(du)技(ji)術(shu)和(he)經(jing)驗(yan)。
根據調查總結,筆者認為要預防池塘養殖海參的病害發生,必須做好海參養殖池塘的清淤和消毒。具體做法有以下幾點:
一、改變傳統的清淤方法,做到清淤徹底幹淨不留後患。
海(hai)參(can)養(yang)殖(zhi)池(chi)與(yu)蝦(xia)養(yang)殖(zhi)池(chi)的(de)清(qing)淤(yu)方(fang)法(fa)有(you)所(suo)不(bu)同(tong),主(zhu)要(yao)是(shi)因(yin)為(wei)海(hai)參(can)池(chi)內(nei)設(she)有(you)人(ren)工(gong)築(zhu)礁(jiao),這(zhe)給(gei)清(qing)淤(yu)工(gong)作(zuo)帶(dai)來(lai)很(hen)大(da)的(de)麻(ma)煩(fan)和(he)困(kun)難(nan)。有(you)很(hen)多(duo)參(can)池(chi)從(cong)建(jian)成(cheng)就(jiu)從(cong)未(wei)進(jin)行(xing)清(qing)淤(yu),使(shi)池(chi)底(di)的(de)汙(wu)泥(ni)及(ji)海(hai)參(can)糞(fen)便(bian)層(ceng)深(shen)達(da)幾(ji)厘(li)米(mi)或(huo)十(shi)幾(ji)厘(li)米(mi)厚(hou),這(zhe)就(jiu)會(hui)給(gei)池(chi)水(shui)水(shui)質(zhi)造(zao)成(cheng)很(hen)大(da)影(ying)響(xiang),會(hui)降(jiang)低(di)池(chi)中(zhong)的(de)溶(rong)解(jie)氧(yang)含(han)量(liang),導(dao)致(zhi)氨(an)氮(dan)或(huo)硫(liu)化(hua)氫(qing)升(sheng)高(gao),容(rong)易(yi)造(zao)成(cheng)海(hai)參(can)發(fa)病(bing)。傳(chuan)統(tong)的(de)池(chi)塘(tang)清(qing)淤(yu)法(fa),是(shi)利(li)用(yong)冬(dong)季(ji)采(cai)取(qu)翻(fan)耕(geng)日(ri)曬(shai)風(feng)化(hua)方(fang)法(fa)或(huo)把(ba)池(chi)底(di)汙(wu)物(wu)推(tui)到(dao)池(chi)邊(bian)、壩ba坡po,這zhe種zhong方fang法fa處chu理li後hou,池chi底di由you黑hei變bian黃huang,臭chou味wei消xiao失shi。但dan這zhe一yi處chu理li方fang法fa隻zhi是shi表biao麵mian現xian象xiang,並bing未wei解jie決jue根gen本ben問wen題ti,底di泥ni中zhong的de一yi些xie硫liu化hua物wu雖sui被bei氧yang化hua為wei硫liu酸suan鹽yan,底di泥ni變bian黃huang色se,氣qi態tai的de硫liu化hua氫qing等deng揮hui發fa掉diao,臭chou味wei逐zhu步bu消xiao失shi,但dan隨sui著zhe底di泥ni的de逐zhu漸jian幹gan燥zao,細xi菌jun對dui有you機ji物wu的de分fen解jie也ye逐zhu漸jian停ting止zhi,大da量liang的de有you機ji物wu被bei幹gan燥zao後hou仍reng保bao持chi於yu底di泥ni中zhong。待dai參can池chi再zai納na水shui後hou,這zhe些xie底di泥ni仍reng要yao浸jin泡pao於yu水shui中zhong,細xi菌jun、bingjundefenjiehuodongyoukaishijinxing,youqidaolegaowenqi,zaichishuidicengrongjieyanghanliangdishi,yixieliusuanyanyouhuizhongxinbeihaiyuanweiliuhuawu,shichidibianhei,chouweijiazhong。suoyishuocanchidinizhongyoujizhihanliangjiaogaohuoyangzhiyidadaosannianyishang,wuranyanzhongdecanchi,zuihaocaiyongxijiangbenghuoxinichuan,jiangdicengdewuni、糞便及雜藻全部清除出參池以外,並做到徹底幹淨,不留後患。
二、采取衝洗、浸泡的方法,減輕池底的有機汙染。
參池底層汙泥清出後,采用高壓水槍將池內的岩礁逐堆衝刷幹淨,除去汙泥、糞(fen)便(bian)及(ji)雜(za)藻(zao),並(bing)采(cai)取(qu)邊(bian)攪(jiao)動(dong)池(chi)底(di)邊(bian)衝(chong)洗(xi)池(chi)底(di)邊(bian)放(fang)水(shui)的(de)方(fang)式(shi),將(jiang)池(chi)底(di)徹(che)底(di)衝(chong)洗(xi)一(yi)遍(bian),然(ran)後(hou)納(na)水(shui)浸(jin)泡(pao)半(ban)月(yue)後(hou),再(zai)將(jiang)池(chi)水(shui)放(fang)掉(diao),納(na)入(ru)新(xin)鮮(xian)海(hai)水(shui)。納(na)水(shui)要(yao)在(zai)大(da)汛(xun)潮(chao)進(jin)行(xing),每(mei)月(yue)換(huan)水(shui)一(yi)次(ci),直(zhi)至(zhi)春(chun)季(ji)放(fang)苗(miao)前(qian)浸(jin)泡(pao)結(jie)束(shu),生(sheng)產(chan)實(shi)踐(jian)已(yi)證(zheng)明(ming),采(cai)取(qu)這(zhe)種(zhong)方(fang)法(fa)能(neng)夠(gou)大(da)幅(fu)度(du)地(di)降(jiang)低(di)池(chi)底(di)底(di)泥(ni)的(de)有(you)機(ji)汙(wu)染(ran)含(han)量(liang)。
三、注重消毒技術,保護水體潔淨。
海參係底棲生物,長期底棲生活,而病菌、病毒和寄生蟲等也主要集中在池底,同時養成池池底也是硫化氫、氨氮、亞ya硝xiao酸suan鹽yan等deng有you害hai雜za質zhi濃nong度du最zui高gao的de處chu所suo,隻zhi有you首shou先xian使shi池chi底di環huan境jing正zheng常chang才cai能neng從cong根gen本ben上shang預yu防fang病bing害hai發fa生sheng。然ran而er,現xian有you大da量liang海hai參can的de養yang殖zhi池chi均jun為wei蝦xia池chi改gai造zao而er成cheng,池chi底di大da部bu分fen是shi亂luan泥ni底di質zhi,盡jin管guan以yi投tou放fang硬ying質zhi附fu著zhe基ji來lai改gai善shan棲qi息xi環huan境jing,但dan由you於yu成cheng本ben高gao,往wang往wang附fu著zhe基ji投tou量liang不bu足zu,迫po使shi大da部bu分fen海hai參can長chang期qi屈qu棲qi在zai亂luan泥ni之zhi中zhong,這zhe是shi造zao成cheng疾ji病bing繁fan生sheng的de重zhong要yao原yuan因yin之zhi一yi。再zai加jia上shang工gong農nong業ye及ji生sheng活huo汙wu水shui汙wu染ran,養yang殖zhi業ye自zi身shen用yong水shui汙wu染ran,因yin此ci,在zai清qing淤yu工gong作zuo結jie束shu後hou,采cai用yong添tian加jia助zhu淨jing劑ji,攪jiao拌ban、過濾及消毒措施,加強水體自淨,保護水體是十分必要的。最好畝撒50~100千克生石灰或30克/lifangmipiaobaifenjinxingxiaoduchuli,yizhouhoudaiyaoxingxiaoshihou,zaijinshuifeichijitoumiaoyangcheng。zaiyangchengguochengzhong,yeyaogenjuyangzhichishuijidizhidejutiqingkuang,bingzhenduihaicanduozaidongjidiwenbusheshiyifabingdetedian,shishixiaodu,yibanmeibanyuezhiyigeyuemusa30~50千克的生石灰或沸石粉,進行一次消毒或底質改良,為海參生活創造一個良好的生態環境,入冬前再使用一次30~50克/立方米的海參生態基,全池潑灑,並結合投喂口服特效抗生素藥餌,使海參體內積累一定濃度的抗生素以增強海參在冬季的抗病能力。
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