投喂管理係統包括在養殖場選擇、評(ping)價(jia)和(he)驗(yan)證(zheng)飼(si)料(liao),庫(ku)存(cun)管(guan)理(li)和(he)存(cun)儲(chu)以(yi)及(ji)通(tong)過(guo)合(he)理(li)的(de)投(tou)喂(wei)率(lv)將(jiang)飼(si)料(liao)投(tou)喂(wei)給(gei)池(chi)塘(tang)中(zhong)的(de)對(dui)蝦(xia)。在(zai)這(zhe)些(xie)不(bu)步(bu)驟(zhou)中(zhong),首(shou)先(xian)是(shi)與(yu)投(tou)喂(wei)質(zhi)量(liang)相(xiang)關(guan),最(zui)後(hou)是(shi)可(ke)持(chi)續(xu)生(sheng)產(chan)和(he)效(xiao)益(yi)。盡(jin)管(guan)在(zai)水(shui)產(chan)養(yang)殖(zhi)中(zhong)投(tou)喂(wei)管(guan)理(li)很(hen)重(zhong)要(yao),但(dan)是(shi)有(you)關(guan)評(ping)估(gu)不(bu)同(tong)投(tou)喂(wei)管(guan)理(li)技(ji)術(shu)的(de)科(ke)學(xue)研(yan)究(jiu)還(hai)很(hen)少(shao)(Davis et al. 2006)。甚至還很少有研究特別的關注投喂管理和蝦類集中管理係統的關係。
飼料選擇
在zai養yang殖zhi場chang,首shou要yao是shi要yao選xuan擇ze購gou買mai適shi合he的de飼si料liao,使shi蝦xia類lei在zai現xian有you的de養yang殖zhi條tiao件jian下xia獲huo得de最zui大da的de產chan量liang。飼si料liao對dui蝦xia養yang殖zhi性xing能neng的de影ying響xiang會hui在zai不bu同tong養yang殖zhi場chang之zhi間jian變bian化hua,即ji便bian是shi同tong一yi養yang殖zhi場chang,飼si料liao對dui不bu同tong養yang殖zhi池chi塘tang的de蝦xia的de性xing能neng也ye會hui產chan生sheng不bu同tong的de影ying響xiang。不bu是shi所suo有you的de投tou喂wei飼si料liao都dou能neng創chuang造zao價jia值zhi;因此選擇恰當的飼料是蝦養殖管理人員最重要的任務。一般蝦類養殖品種的餌料要求比如:氣qi味wei與yu原yuan料liao成cheng分fen相xiang關guan並bing隨sui著zhe原yuan料liao批pi次ci的de不bu同tong而er變bian化hua,所suo以yi其qi不bu是shi飼si料liao質zhi量liang的de指zhi示shi器qi。常chang規gui養yang殖zhi對dui蝦xia對dui飼si料liao的de需xu求qiu,如ru眾zhong所suo周zhou知zhi的de凡fan納na濱bin對dui蝦xia,現xian代dai化hua的de飼si料liao加jia工gong廠chang都dou使shi用yong經jing過guo證zheng明ming和he驗yan證zheng的de配pei方fang(D’Abramoet al. 1997)。當農民們為了降低投入而更改當前使用的飼料時要非常的謹慎,因為此時的節省投入可能在生產旺季導致金錢的損失。
在(zai)選(xuan)擇(ze)飼(si)料(liao)並(bing)將(jiang)它(ta)用(yong)到(dao)生(sheng)產(chan)過(guo)程(cheng)中(zhong)去(qu)時(shi),首(shou)先(xian)要(yao)考(kao)慮(lv)的(de)一(yi)個(ge)因(yin)素(su)就(jiu)是(shi)飼(si)料(liao)轉(zhuan)化(hua)率(lv)會(hui)隨(sui)飲(yin)食(shi)中(zhong)營(ying)養(yang)密(mi)度(du)而(er)變(bian)化(hua),因(yin)此(ci)在(zai)飼(si)料(liao)投(tou)喂(wei)時(shi)必(bi)須(xu)根(gen)據(ju)這(zhe)個(ge)作(zuo)相(xiang)應(ying)的(de)調(tiao)整(zheng)。如(ru)果(guo)需(xu)要(yao)更(geng)高(gao)濃(nong)度(du)營(ying)養(yang)的(de)飼(si)料(liao),可(ke)以(yi)減(jian)少(shao)飼(si)料(liao)的(de)投(tou)喂(wei)量(liang)。例(li)如(ru),均(jun)衡(heng)的(de)飼(si)料(liao)中(zhong)含(han)有(you)40%的蛋白質,飼料投喂量為飽食投喂的75%,而同樣條件下如果是含有30%的蛋白質則飼料投喂量為100%(飽食或接近飽食)。雖然高蛋白飼料的成本更高,但是通過降低飼料投喂量可以將飼料成本高這一損失彌補回來(Patnaik和Samocha 2009)。了解飼料潛在的轉化率,對飼料管理是至關重要的。從營養保留作一些假設,我們可以對飼料轉化率(FCR)做一些快速計算。使用含40%粗蛋白的蝦用飼料投喂生產1kg的蝦,需要1.25kg的飼料,這意味著FCR等於1.25:1.0。另一方麵,以產生相同的1公斤的蝦,使用了30%的粗蛋白飼料,需要1.67公斤飼料,這意味著的FCR等於1.67:1.0。在(zai)給(gei)定(ding)的(de)條(tiao)件(jian)下(xia),如(ru)果(guo)低(di)蛋(dan)白(bai)飼(si)料(liao)與(yu)動(dong)物(wu)的(de)營(ying)養(yang)需(xu)求(qiu)一(yi)致(zhi),通(tong)過(guo)增(zeng)加(jia)每(mei)天(tian)的(de)投(tou)喂(wei)量(liang)來(lai)增(zeng)加(jia)每(mei)天(tian)飼(si)料(liao)中(zhong)蛋(dan)白(bai)質(zhi)的(de)攝(she)入(ru)量(liang)不(bu)會(hui)促(cu)進(jin)蝦(xia)的(de)增(zeng)長(chang),但(dan)可(ke)以(yi)增(zeng)高(gao)了(le)飼(si)料(liao)轉(zhuan)化(hua)率(lv)以(yi)及(ji)加(jia)重(zhong)了(le)係(xi)統(tong)的(de)汙(wu)染(ran)負(fu)荷(he)。同(tong)樣(yang),如(ru)果(guo)一(yi)個(ge)人(ren)選(xuan)擇(ze)在(zai)飼(si)料(liao)投(tou)喂(wei)量(liang)不(bu)變(bian)的(de)情(qing)況(kuang)下(xia)以(yi)增(zeng)加(jia)飼(si)料(liao)中(zhong)蛋(dan)白(bai)質(zhi)的(de)水(shui)平(ping),增(zeng)長(chang)不(bu)會(hui)提(ti)高(gao),但(dan)飼(si)料(liao)轉(zhuan)化(hua)率(lv)保(bao)持(chi)不(bu)變(bian)。在(zai)這(zhe)種(zhong)情(qing)況(kuang)下(xia),蛋(dan)白(bai)質(zhi)的(de)利(li)用(yong)效(xiao)率(lv)降(jiang)低(di),蛋(dan)白(bai)質(zhi)代(dai)謝(xie)的(de)一(yi)個(ge)副(fu)產(chan)品(pin)氮(dan)廢(fei)物(wu)增(zeng)加(jia)。想(xiang)要(yao)保(bao)持(chi)對(dui)蝦(xia)的(de)增(zeng)長(chang)水(shui)平(ping),飼(si)料(liao)中(zhong)適(shi)合(he)的(de)營(ying)養(yang)價(jia)值(zhi)以(yi)及(ji)適(shi)宜(yi)的(de)投(tou)喂(wei)量(liang),以(yi)滿(man)足(zu)對(dui)蝦(xia)得(de)營(ying)養(yang)需(xu)求(qiu)是(shi)非(fei)常(chang)重(zhong)要(yao)的(de)。
飼料評估和驗收
對於每一批進入農場的飼料,應立即開始評估。應要評估的參數包括物理特性,例如顏色,水穩定性,原料成分的顆粒大小、飼料的顆粒大小、水分、過guo高gao的de投tou入ru和he黴mei菌jun的de存cun在zai。就jiu蝦xia飼si料liao的de誘you食shi性xing,消xiao耗hao或huo飼si料liao的de營ying養yang質zhi量liang而er言yan,飼si料liao的de顏yan色se並bing不bu是shi最zui重zhong要yao的de影ying響xiang因yin素su。它ta會hui受shou到dao原yuan料liao組zu成cheng及ji生sheng產chan工gong藝yi變bian化hua的de影ying響xiang。許xu多duo飼si料liao廠chang家jia喜xi歡huan生sheng產chan出chu來lai的de飼si料liao的de顏yan色se較jiao深shen,這zhe與yu傳chuan統tong上shang暗an魚yu粉fen的de存cun在zai有you關guan。然ran而er,人ren們men認ren識shi到dao魚yu粉fen的de顏yan色se隨sui著zhe批pi次ci、魚的來源以及處理情況的不同而不同,此外,許多與亮色和深色有關的成分(魚粉是其中之一)常(chang)常(chang)導(dao)致(zhi)飼(si)料(liao)粒(li)狀(zhuang)顏(yan)色(se)變(bian)化(hua)。例(li)如(ru),轉(zhuan)變(bian)魚(yu)粉(fen)類(lei)型(xing)或(huo)增(zeng)加(jia)植(zhi)物(wu)蛋(dan)白(bai)源(yuan)的(de)水(shui)平(ping),可(ke)能(neng)會(hui)產(chan)生(sheng)較(jiao)淺(qian)的(de)顏(yan)色(se),這(zhe)並(bing)不(bu)意(yi)味(wei)著(zhe)飼(si)料(liao)質(zhi)量(liang)低(di)劣(lie),而(er)僅(jin)僅(jin)是(shi)顏(yan)色(se)上(shang)的(de)一(yi)個(ge)簡(jian)單(dan)變(bian)化(hua)。氣(qi)味(wei)與(yu)顏(yan)色(se)一(yi)樣(yang),也(ye)常(chang)作(zuo)為(wei)一(yi)種(zhong)評(ping)估(gu)指(zhi)標(biao),它(ta)與(yu)原(yuan)料(liao)組(zu)成(cheng)成(cheng)分(fen)和(he)不(bu)飽(bao)和(he)脂(zhi)肪(fang)酸(suan)的(de)變(bian)質(zhi)有(you)關(guan),會(hui)影(ying)響(xiang)到(dao)飼(si)料(liao)的(de)誘(you)食(shi)性(xing)和(he)質(zhi)量(liang)。飼(si)料(liao)顏(yan)色(se)和(he)氣(qi)味(wei)的(de)變(bian)化(hua)不(bu)僅(jin)僅(jin)受(shou)到(dao)飼(si)料(liao)原(yuan)料(liao)組(zu)成(cheng)變(bian)化(hua)的(de)影(ying)響(xiang),還(hai)會(hui)受(shou)到(dao)原(yuan)料(liao)批(pi)次(ci)的(de)影(ying)響(xiang),因(yin)此(ci)飼(si)料(liao)顏(yan)色(se)和(he)氣(qi)味(wei)的(de)變(bian)化(hua)不(bu)能(neng)說(shuo)明(ming)就(jiu)是(shi)飼(si)料(liao)的(de)質(zhi)量(liang)的(de)變(bian)化(hua)。
飼料顆粒投喂後直至被蝦類在水中攝食需要很長時間(如30min);yincizaixialeisheshisiliaozhiqianbuyaoquebaosiliaobufashengrongshixianxiang,zheshuomingsiliaozaishuizhongyaoyouyidingdewendingxing。shishibiaomingxialeisheshixuyaojiaochangdeshijian,yincixuyaoerliaojuyougenggaodeshuizhongwendingxing。siliaodekeliyingduheshuizhongwendingxingwanquanyilaiyujiagongchengxu、天然原料的組成和人工粘合劑。飼料的水穩定性以3-4xiaoshiweiyi。shuiwendingxingzheyitezhengdepingjiazhibiaoshifeichangzhuguande,shizaicongsiliaozhongsuijiquyangzhongdedaode。xianjieduanyiyouxuduozhenduisiliaozhiliangdepingjiajishu,qizhongbaokuoduanqihechangqideshiyanfangfa。zaizhegepingjiaguochengzhongmeiyoubiaozhunfangfa,qizhongzuizhongyaodeshizenyangtongguohouxudechengxuzuodaozheyidian。liru,fang100個飼料顆粒在一個盛滿水的燒杯中來觀測浮性顆粒飼料的比例(最小比例)和監測飼料顆粒的穩定性。同樣的,確定投喂量的方式可以直接投放在水中(例如:100g飼料直接投放在燒杯中)或者用水下多孔容器(如濾茶器)中(zhong)並(bing)防(fang)止(zhi)降(jiang)解(jie)。飼(si)料(liao)溶(rong)失(shi)或(huo)裂(lie)解(jie)百(bai)分(fen)比(bi)通(tong)過(guo)特(te)定(ding)的(de)時(shi)間(jian)間(jian)隔(ge)記(ji)錄(lu)並(bing)與(yu)標(biao)準(zhun)品(pin)進(jin)行(xing)比(bi)較(jiao)。這(zhe)個(ge)結(jie)果(guo)可(ke)以(yi)被(bei)量(liang)化(hua),或(huo)者(zhe)溶(rong)失(shi)的(de)重(zhong)量(liang)可(ke)以(yi)被(bei)準(zhun)確(que)稱(cheng)量(liang)。在(zai)給(gei)定(ding)的(de)時(shi)間(jian)範(fan)圍(wei)內(nei)損(sun)失(shi)的(de)重(zhong)量(liang)越(yue)多(duo),表(biao)示(shi)飼(si)料(liao)顆(ke)粒(li)的(de)水(shui)穩(wen)定(ding)性(xing)越(yue)差(cha)。
siliaoyuanliaokelidedaxiaoshilingyigexuyaokaolvdeyinsu。siliaoyuanliaodekelidaxiaojueyumozhifangfa,bingqieyingxiangdekelidezhanheduhewulijiegou。ciwai,youyuxiaduisiliaokelidaxiaoyouxuanzexing,siliaokelidaxiaohuiyingxiangxiadesheshiliang,zhekenenghuiyingxiangyingyangliyonglv。siliaokelidaxiaoqujueyuxiadedaxiao,fanweicongfeichangxiaodeyouxiasiliao(小於50微米),到3/32的直徑(2.38毫米),到超過1/8英寸直徑(3.18毫米)deyixiechengxiasiliao。zhiguanzhongyaodeshi,xianongyaogenjuxiazaishengmingzhouqizhongsuochudejieduantigongheshikelidaxiaodesiliao。siliaokelidaxiaodechayiyuxiadeshixinghechongzudesiliaofenpeiyouguan。tongchangqingkuangxia,fenliao(細,中,粗)的生產需要用輥式粉碎機壓裂到3/32yingcunzhijingliliao。yinci,siliaoyuanliaobixuchongfenhunheyibaochisuoyoudekelidouyouleisideyingyangchengfen。siliaozhongmeijundewuranyeshixianongsuomianlindeyigewenti,tebieshinaxiegaoshiduhuanjingli。youyuyuanliaohejiagonggongyichulibudang,huoyunshuhe/huocunchubudang,siliaokenengbeihuangqumeiwuran。beimeijunwurandesiliaobixuyaoyanfangjinruyangzhichang。lingwai,zaipinqinggongrenhouyouxianyaozuodeshijiushipeixuntamenshibiesiliaozhongcunzaidewentidenengli。
對飼料質量的檢測除了以前的評估外,建議每3到6geyuejinxingyicichangtaihuajianyan。zhegejianyankeyiyoushiyanshijinxingdulidefenxi,jieguoyusiliaochangtigongdezhijinxingduibi。zaishishizhiliangkongzhicuoshiguochengzhong,guanjianwentishiquyangshijihefangshiyaoheshi,yiquebaomeipihuodoujinxingquyang,bingtigongjieguofankuidaosiliaochang。gongyefenxisuibunengbaozhengshiwanquanxiangtongdefenxijieguo,danyinggaishixiangdangjiejinde。ciwai,tongguodingqidesiliaozhiliangjiance,yekeyitigongsiliaoyangfenhanliangdebianhuaqushi,duisiliaochangzaizhiliangkongzhibiaozhunshanglaijiangshiyigehenhaodezhishiqi。
yangzhichangbixuyaozuodaoxianjingguojiancezaijuedingyongbuyongmougesiliaochangdesiliao。zhegejuedingtongchangshijiyutedingpicisiliaodeyigehuoduogepinggucanshu。tongshizaishiyongguochengzhongduimeipicidesiliaodouyaojishidejiance。ruguomouyipisiliaozhongjiancedaoyigewentiyinglijitongzhisiliaochangshang。raneryidansiliaoyijingjiaofudaoxianongshouzhonghenchangyiduanshijian,siliaochangjiashibutaikenengjieshouhuochengrensiliaobenshencunzaiwenti。yinci,zaiyangzhichangzhong,siliaoyanshouxiandezhiguanzhongyao,zhejiangjuedingzhewomenxiayibudesiliaoguanliheshiyong。
庫存管理和飼料儲藏
對蝦養殖戶通常購買的飼料裝在聚乙烯的塑料袋中,平均重量為25~40kg/袋,一批最少的為10t。在zai一yi些xie地di點dian,飼si料liao通tong過guo飼si料liao卡ka車che大da量liang的de運yun到dao養yang殖zhi戶hu手shou中zhong,然ran後hou貯zhu藏zang在zai飼si料liao倉cang庫ku中zhong。這zhe是shi最zui有you效xiao和he最zui好hao的de運yun輸shu方fang法fa,即ji使shi在zai許xu多duo國guo家jia還hai無wu法fa采cai用yong這zhe個ge方fang法fa。合he適shi的de飼si料liao儲chu存cun需xu要yao儲chu存cun間jian避bi免mian受shou潮chao和he過guo熱re,因yin為wei潮chao濕shi和he熱re是shi真zhen菌jun生sheng長chang的de理li想xiang條tiao件jian而er且qie會hui減jian少shao飼si料liao的de營ying養yang質zhi量liang。飼si料liao貯zhu藏zang間jian應ying該gai用yong波bo紋wen金jin屬shu板ban或huo者zhe具ju有you混hun凝ning土tu地di板ban的de混hun凝ning土tu牆qiang構gou建jian。飼si料liao堆dui放fang的de層ceng高gao應ying該gai在zai混hun凝ning土tu地di板ban上shang5~7層以及包括其他繼續存放飼料的托板。飼料堆間彼此距離應該約750px,以保證飼料間有空氣流通,同樣,飼料堆需要距牆麵約30~1250px。yinweiyuqiangjiechuhuidaozhiwendubutonghebuduandeshuifenyidongdaozhizhenjundezisheng,erqietongyanghuiyinqijianzhuwujiegoudewenti。biaoqianyinggaibaokuoshengchanshang,shengchanriqi,shengchandidian,changguifenxihechengfenliebiao。
采(cai)用(yong)合(he)適(shi)的(de)貯(zhu)藏(zang)技(ji)術(shu)應(ying)該(gai)使(shi)生(sheng)產(chan)日(ri)期(qi)較(jiao)早(zao)的(de)飼(si)料(liao)最(zui)先(xian)使(shi)用(yong)。飼(si)料(liao)貯(zhu)藏(zang)應(ying)盡(jin)可(ke)能(neng)的(de)減(jian)少(shao)貯(zhu)藏(zang)時(shi)間(jian)。即(ji)使(shi)不(bu)能(neng)避(bi)免(mian)大(da)量(liang)存(cun)儲(chu)的(de)情(qing)形(xing),但(dan)存(cun)儲(chu)時(shi)間(jian)長(chang)於(yu)飼(si)料(liao)生(sheng)產(chan)後(hou)三(san)個(ge)月(yue)的(de)飼(si)料(liao)不(bu)推(tui)薦(jian)使(shi)用(yong)。大(da)規(gui)模(mo)的(de)養(yang)殖(zhi)戶(hu)可(ke)能(neng)選(xuan)擇(ze)飼(si)料(liao)貯(zhu)藏(zang)分(fen)配(pei)站(zhan)優(you)化(hua)飼(si)料(liao)運(yun)輸(shu)。這(zhe)些(xie)分(fen)配(pei)站(zhan)至(zhi)少(shao)要(yao)具(ju)備(bei)包(bao)括(kuo)混(hun)凝(ning)土(tu)地(di)板(ban)和(he)避(bi)雨(yu)保(bao)護(hu)設(she)施(shi)等(deng)條(tiao)件(jian)以(yi)減(jian)少(shao)飼(si)料(liao)損(sun)失(shi)。同(tong)時(shi)需(xu)要(yao)培(pei)養(yang)專(zhuan)職(zhi)員(yuan)工(gong)進(jin)行(xing)日(ri)常(chang)的(de)隨(sui)機(ji)抽(chou)樣(yang),特(te)別(bie)是(shi)飼(si)料(liao)在(zai)投(tou)喂(wei)前(qian)要(yao)在(zai)養(yang)殖(zhi)場(chang)存(cun)儲(chu)超(chao)過(guo)兩(liang)周(zhou)的(de)。這(zhe)樣(yang)可(ke)以(yi)在(zai)養(yang)殖(zhi)廠(chang)隨(sui)機(ji)選(xuan)取(qu)飼(si)料(liao)袋(dai)並(bing)檢(jian)查(zha)黴(mei)菌(jun)含(han)量(liang)或(huo)腐(fu)敗(bai)程(cheng)度(du)。大(da)多(duo)數(shu)養(yang)殖(zhi)戶(hu)采(cai)用(yong)其(qi)自(zi)有(you)的(de)檢(jian)測(ce)係(xi)統(tong)及(ji)通(tong)過(guo)進(jin)貨(huo)和(he)投(tou)喂(wei)的(de)平(ping)衡(heng)確(que)保(bao)飼(si)料(liao)進(jin)入(ru)養(yang)殖(zhi)場(chang)後(hou)可(ke)以(yi)及(ji)時(shi)的(de)投(tou)喂(wei)給(gei)對(dui)蝦(xia),這(zhe)樣(yang)可(ke)以(yi)確(que)保(bao)在(zai)所(suo)有(you)的(de)生(sheng)產(chan)環(huan)節(jie)對(dui)蝦(xia)都(dou)能(neng)攝(she)食(shi)到(dao)高(gao)質(zhi)量(liang)的(de)飼(si)料(liao)。由(you)於(yu)在(zai)半(ban)集(ji)約(yue)化(hua)對(dui)蝦(xia)養(yang)殖(zhi)中(zhong)飼(si)料(liao)通(tong)常(chang)是(shi)最(zui)大(da)的(de)成(cheng)本(ben)組(zu)成(cheng)部(bu)分(fen),因(yin)此(ci)在(zai)各(ge)個(ge)環(huan)節(jie)中(zhong)需(xu)要(yao)格(ge)外(wai)注(zhu)意(yi)和(he)小(xiao)心(xin)以(yi)確(que)保(bao)飼(si)料(liao)不(bu)會(hui)造(zao)成(cheng)不(bu)必(bi)要(yao)的(de)浪(lang)費(fei)。
投喂措施
投喂管理與池塘準備以及其他與投喂直接相關的因素有關,如投喂點,投喂時間,投喂量,水質影響,投喂率,和營養吸收等。
池塘的準備
對(dui)蝦(xia)為(wei)底(di)棲(qi)習(xi)性(xing),依(yi)賴(lai)底(di)棲(qi)習(xi)性(xing)進(jin)行(xing)攝(she)食(shi)和(he)隱(yin)蔽(bi)。因(yin)此(ci)保(bao)持(chi)一(yi)個(ge)健(jian)康(kang)的(de)低(di)有(you)機(ji)物(wu)含(han)量(liang)的(de)池(chi)底(di)是(shi)養(yang)殖(zhi)係(xi)統(tong)的(de)重(zhong)要(yao)部(bu)分(fen)和(he)投(tou)喂(wei)管(guan)理(li)措(cuo)施(shi)。經(jing)過(guo)合(he)理(li)準(zhun)備(bei)的(de)池(chi)塘(tang)將(jiang)會(hui)提(ti)高(gao)自(zi)然(ran)地(di)生(sheng)產(chan)率(lv)並(bing)提(ti)供(gong)非(fei)飼(si)料(liao)源(yuan)的(de)大(da)量(liang)營(ying)養(yang)。在(zai)放(fang)養(yang)仔(zai)蝦(xia)前(qian)幾(ji)周(zhou)通(tong)過(guo)池(chi)塘(tang)施(shi)肥(fei)可(ke)以(yi)培(pei)育(yu)天(tian)然(ran)的(de)餌(er)料(liao)生(sheng)物(wu)。這(zhe)些(xie)非(fei)飼(si)料(liao)源(yuan)的(de)大(da)量(liang)生(sheng)物(wu)營(ying)養(yang)來(lai)源(yuan)可(ke)能(neng)對(dui)集(ji)約(yue)化(hua)或(huo)半(ban)集(ji)約(yue)化(hua)生(sheng)產(chan)具(ju)有(you)重(zhong)要(yao)影(ying)響(xiang),但(dan)是(shi)在(zai)較(jiao)高(gao)放(fang)養(yang)密(mi)度(du)的(de)集(ji)約(yue)化(hua)養(yang)殖(zhi)係(xi)統(tong)中(zhong)其(qi)重(zhong)要(yao)性(xing)有(you)所(suo)減(jian)少(shao)。在(zai)生(sheng)產(chan)過(guo)程(cheng)的(de)前(qian)幾(ji)周(zhou)中(zhong)池(chi)塘(tang)的(de)肥(fei)力(li)準(zhun)備(bei)特(te)別(bie)重(zhong)要(yao),因(yin)為(wei)對(dui)蝦(xia)後(hou)期(qi)幼(you)體(ti)和(he)幼(you)蝦(xia)的(de)分(fen)布(bu)會(hui)受(shou)到(dao)食(shi)物(wu)分(fen)布(bu)的(de)重(zhong)要(yao)影(ying)響(xiang)。
餌料分布和投喂頻率
基ji於yu對dui蝦xia的de大da小xiao和he不bu同tong的de生sheng產chan階jie段duan,飼si料liao的de分fen配pei技ji術shu會hui存cun在zai變bian化hua。在zai養yang殖zhi的de前qian幾ji周zhou,對dui蝦xia養yang殖zhi戶hu通tong常chang在zai池chi塘tang邊bian緣yuan提ti供gong少shao量liang的de飼si料liao以yi補bu充chong來lai自zi初chu級ji生sheng產chan的de營ying養yang。當dang對dui蝦xia開kai始shi快kuai速su生sheng長chang時shi,飼si料liao會hui均jun勻yun的de投tou喂wei到dao整zheng個ge池chi塘tang。飼si料liao投tou喂wei可ke采cai用yong一yi些xie不bu同tong的de方fang法fa,如ru劃hua小xiao船chuan按an曲qu折zhe線xian路lu進jin行xing投tou喂wei,自zi動dong投tou餌er機ji,甚shen至zhi通tong過guo許xu多duo平ping均jun分fen布bu在zai池chi塘tang中zhong料liao罾zeng提ti供gong少shao量liang的de飼si料liao。還hai有you一yi些xie養yang殖zhi戶hu采cai用yong能neng夠gou吹chui動dong飼si料liao遠yuan離li池chi邊bian15m的(de)地(di)麵(mian)鼓(gu)風(feng)機(ji)進(jin)行(xing)投(tou)喂(wei)。同(tong)時(shi)在(zai)一(yi)些(xie)養(yang)殖(zhi)廠(chang)中(zhong)料(liao)罾(zeng)用(yong)來(lai)觀(guan)察(cha)蝦(xia)的(de)攝(she)食(shi)情(qing)況(kuang)。在(zai)這(zhe)些(xie)投(tou)喂(wei)方(fang)式(shi)中(zhong),存(cun)在(zai)著(zhe)勞(lao)動(dong)力(li),裝(zhuang)備(bei)和(he)運(yun)用(yong)措(cuo)施(shi)的(de)時(shi)間(jian)等(deng)限(xian)製(zhi)性(xing)因(yin)素(su)。
需(xu)要(yao)注(zhu)意(yi)的(de)是(shi),在(zai)任(ren)何(he)商(shang)業(ye)性(xing)的(de)對(dui)蝦(xia)養(yang)殖(zhi)場(chang)中(zhong)員(yuan)工(gong)在(zai)投(tou)喂(wei)過(guo)程(cheng)中(zhong)責(ze)任(ren)心(xin)的(de)監(jian)管(guan)措(cuo)施(shi)都(dou)非(fei)常(chang)的(de)重(zhong)要(yao)。由(you)於(yu)在(zai)夜(ye)間(jian)監(jian)督(du)人(ren)員(yuan)操(cao)作(zuo)的(de)困(kun)難(nan)性(xing),大(da)多(duo)數(shu)對(dui)蝦(xia)養(yang)殖(zhi)戶(hu)選(xuan)擇(ze)其(qi)主(zhu)要(yao)在(zai)白(bai)天(tian)進(jin)行(xing)投(tou)喂(wei)。在(zai)過(guo)去(qu)有(you)一(yi)些(xie)養(yang)殖(zhi)場(chang)采(cai)用(yong)過(guo)夜(ye)間(jian)占(zhan)一(yi)定(ding)的(de)投(tou)喂(wei)比(bi)例(li),然(ran)而(er)這(zhe)些(xie)措(cuo)施(shi)沒(mei)有(you)明(ming)顯(xian)的(de)收(shou)效(xiao),且(qie)因(yin)為(wei)實(shi)際(ji)操(cao)作(zuo)中(zhong)的(de)困(kun)難(nan)和(he)沒(mei)有(you)明(ming)顯(xian)的(de)經(jing)濟(ji)效(xiao)益(yi)而(er)沒(mei)有(you)得(de)到(dao)廣(guang)泛(fan)推(tui)行(xing)。另(ling)外(wai),不(bu)同(tong)養(yang)殖(zhi)戶(hu)投(tou)喂(wei)時(shi)間(jian)和(he)投(tou)喂(wei)量(liang)存(cun)在(zai)著(zhe)極(ji)大(da)不(bu)同(tong),但(dan)總(zong)的(de)來(lai)講(jiang)投(tou)喂(wei)頻(pin)率(lv)從(cong)一(yi)天(tian)2次到一天4次不等,早上開始於6:00am到8:00,下午結束於4:00pm到6:00pm。
實際飼養指南
表1.不同國家的配合飼料投喂量建議表
|
蝦重(g) |
生物量(%)厄瓜多爾 |
生物量(%)哥倫比亞 |
生物量(%)墨西哥 |
|
0.05 |
|
20.2 |
|
|
0.1 |
|
17 |
|
|
0.18 |
|
14.7 |
|
|
0.31 |
|
12.8 |
|
|
0.54 |
20 |
11.1 |
|
|
1 |
12 |
10.1 |
15.5 |
|
2 |
9 |
8.5 |
12.5 |
|
3 |
7 |
7.7 |
10.1 |
|
4 |
5.5 |
7.1 |
7.9 |
|
5 |
4.7 |
4.4 |
6.6 |
|
6 |
4.2 |
4 |
5.6 |
|
7 |
3.7 |
3.6 |
4.9 |
|
8 |
3.5 |
3.4 |
4.4 |
|
9 |
3.2 |
3.2 |
4 |
|
10 |
3 |
3 |
3.7 |
|
11 |
2.9 |
2.8 |
3.4 |
|
12 |
2.8 |
2.7 |
3.2 |
|
13 |
2.75 |
2.6 |
3.1 |
|
14 |
2.75 |
2.5 |
3 |
|
15 |
2.75 |
2.6 |
2.9 |
|
16 |
|
2.5 |
2.9 |
|
17 |
|
2.4 |
2.8 |
|
18 |
|
2.4 |
2.8 |
|
19 |
|
2.3 |
2.6 |
|
20 |
|
2.2 |
2.6 |
通常情況下商業化養殖池塘的投喂率,大多都是以飼料準則表(表1)為wei基ji礎chu而er計ji算suan的de。這zhe些xie準zhun則ze是shi基ji於yu池chi塘tang蝦xia生sheng物wu總zong量liang來lai按an照zhao相xiang應ying的de百bai分fen比bi來lai計ji算suan投tou喂wei飼si料liao的de幹gan重zhong。生sheng物wu總zong量liang取qu決jue於yu定ding期qi監jian測ce的de蝦xia的de估gu計ji數shu量liang(存活數)與其平均體重(增長)。ciwai,rushangsuoshu,genjuzaochenrongyangshuiping,wendu,liaozengshangsiliaoshengyuliangyijiqianqidetouweiliangdengyinsutiaozhengmeiridetouweiliangshihenchangjiande。yiyoushijianfaxianzhexieyinsuzaiyangzhishangbanqinenggouhenhaodizhidaoshiyidesiliaotouweiliang,danzaiyangzhizhonghouqi,suizhesiliaotouweiliangdechixuzengchang,duixiadeshengchangsuduhuifanghuan,suizhierlaijiuhuizaochengsiliaozhuanhualvpiangao。liru,shiyongdanbaihanliangwei35%的飼料投喂10g的蝦,根據當前的數據顯示其投喂量為蝦體重的2.8%,這意味著飼料投喂量為每天0.28克或每周1.96克。若假定每周生長1g,則飼料轉化率相當於1.96:1.0。當蝦生長到14克時,根據傳統喂養表其投喂量則為體重的2.2%或是每周投喂飼料2.16克,若蝦繼續生長,每周增長1克則飼料轉化率將上升至2.16:1.0。這些例子體現了我們對飼料管理和整個養殖過程缺乏理解。其中集中體現在“如果我們增加飼料的投入使蝦長的生長非常好,我們增加飼料的投入量剛好和蝦的生長持平,我們增加飼料的投入使蝦不成長”,huanjuhuashuojiushisuoyouguanlidouhuizengjiasiliaodetouweiliang。zuihoudejieguoshitouweiliangguoda,zaochengchitangdibuleijideliuhuaqingzaiyanyangtangzhongdechenjiwuranzhenggechitang,zengjiashenghuaxuyangliang(BOD),減少溶解氧(DO),降(jiang)低(di)攝(she)食(shi)量(liang),並(bing)最(zui)終(zhong)增(zeng)加(jia)死(si)亡(wang)率(lv)。此(ci)外(wai),在(zai)整(zheng)個(ge)養(yang)殖(zhi)係(xi)統(tong)中(zhong)與(yu)飼(si)料(liao)相(xiang)關(guan)的(de)汙(wu)染(ran)物(wu)也(ye)會(hui)增(zeng)加(jia)。另(ling)一(yi)方(fang)麵(mian),攝(she)入(ru)不(bu)足(zu)可(ke)能(neng)會(hui)對(dui)蝦(xia)本(ben)身(shen)的(de)產(chan)生(sheng)更(geng)多(duo)的(de)脅(xie)迫(po)和(he)/或繼發性感染,進而使導致增長率降低和死亡率增加。
為了優化當前飼料管理方式,戴維斯等人(2008)建議在考慮養殖場預期的飼料轉化率和曆史數據的基礎上對飼料投喂方式進行修改。由於對蝦的生長率會受到種類、基(ji)因(yin)和(he)養(yang)殖(zhi)環(huan)境(jing)的(de)影(ying)響(xiang),在(zai)不(bu)同(tong)養(yang)殖(zhi)場(chang)中(zhong)詳(xiang)細(xi)的(de)進(jin)行(xing)養(yang)殖(zhi)記(ji)錄(lu)是(shi)非(fei)常(chang)有(you)必(bi)要(yao)的(de)投(tou)喂(wei)。想(xiang)要(yao)知(zhi)道(dao)一(yi)個(ge)池(chi)塘(tang)的(de)投(tou)喂(wei)量(liang)是(shi)否(fou)過(guo)量(liang),必(bi)需(xu)首(shou)先(xian)要(yao)知(zhi)道(dao)在(zai)正(zheng)常(chang)生(sheng)長(chang)率(lv)的(de)條(tiao)件(jian)下(xia)“理論”上shang的de飼si料liao轉zhuan化hua率lv是shi多duo少shao。這zhe個ge值zhi可ke以yi通tong過guo在zai試shi驗yan條tiao件jian下xia的de操cao作zuo來lai確que定ding,也ye可ke以yi通tong過guo一yi些xie假jia設she來lai推tui算suan出chu一yi個ge合he理li的de數shu據ju。例li如ru,我wo們men知zhi道dao蝦xia體ti中zhong蛋dan白bai含han量liang約yue為wei15%,而對蛋白質的留存量為30%。因此增長1千克蝦(1000)中蛋白質的增長量為150克(1000×0.15),而想要蝦體蛋白質增長量達到150g則需要500克蛋白質(150 / 0.3)。如果我們使用35%蛋白質飼料,則需要投喂1.4kg的飼料。也就是說根據理論飼料轉化率為1.4:1來計算,養出1kg的蝦需要1.4千克蛋白質含量為35%的de飼si料liao。這zhe一yi理li論lun的de飼si料liao轉zhuan化hua率lv可ke用yong於yu協xie助zhu飼si料liao管guan理li。通tong過guo這zhe個ge框kuang架jia,我wo們men能neng夠gou控kong製zhi飼si養yang投tou喂wei的de上shang限xian和he下xia限xian。例li如ru,一yi個ge養yang殖zhi場chang擁yong有you有you著zhe典dian型xing增zeng長chang率lv蝦xia(克/每周,蝦體重>3克),放養密度為每平方米35隻蝦以及每公頃350000隻蝦。假設我們可以在周期結束時按80%的存活率計算,養殖後期飼料投入的上限為:1g/周×1.4(飼料轉化率FCR)×280000隻蝦/公頃×1千克/1000克= 392千克飼料每公頃每周或是392kg/7天= 56千克/公頃/天,假設存活率為80%。
所有投喂量估算中具有的一個限製因素是池塘中實際蝦的數量估計。在計算中,我們假定的存活率是80%,但dan在zai養yang殖zhi場chang內nei,這zhe一yi數shu據ju顯xian然ran是shi局ju限xian於yu典dian型xing的de有you利li於yu對dui蝦xia生sheng長chang存cun活huo的de養yang殖zhi池chi塘tang。如ru果guo飼si料liao投tou喂wei量liang超chao過guo這zhe個ge值zhi,那na麼me顯xian然ran是shi過guo量liang投tou喂wei。通tong常chang情qing況kuang下xia,從cong以yi往wang的de數shu據ju已yi經jing現xian今jin的de實shi際ji數shu據ju來lai看kan,池chi塘tang實shi際ji的de存cun活huo率lv會hui比bi80%這個值低。例如,在整個養殖周期結束時,存活率為60%比較合理,那麼在實際生產過程我們就需要根據這個值以及特定的時間節點來合理估計在養殖過程中的蝦的數量或者以整個養殖周期中60%的存活率來估算。這就意味著每天每公頃能提供42千qian克ke的de飼si料liao,從cong而er估gu算suan出chu投tou喂wei量liang的de下xia限xian值zhi。通tong過guo計ji算suan這zhe兩liang個ge值zhi,我wo們men可ke以yi將jiang日ri常chang投tou喂wei量liang控kong製zhi在zai期qi望wang的de下xia限xian值zhi內nei,從cong而er最zui大da限xian度du的de減jian少shao過guo量liang的de投tou喂wei。當dang涉she及ji到dao具ju體ti的de投tou喂wei量liang時shi,很hen難nan有you固gu定ding的de答da案an,但dan是shi關guan鍵jian是shi要yao從cong飼si料liao投tou喂wei所suo用yong的de工gong具ju以yi及ji池chi塘tang的de基ji礎chu數shu據ju上shang獲huo得de有you效xiao的de信xin息xi來lai進jin行xing評ping估gu。
水質的注意事項
飼料管理可以直接影響池塘水體和土壤的質量(Boyd和Tucker 1998, Boyd 2001, Boyd et al. 2007)。在製定投喂計劃時需要考慮水質參數如溶解氧(DO)和he溫wen度du。針zhen對dui水shui質zhi的de變bian化hua需xu要yao積ji極ji地di測ce量liang而er不bu是shi被bei動dong的de行xing動dong。因yin此ci,減jian少shao水shui體ti溶rong氧yang率lv將jiang導dao致zhi飼si料liao投tou入ru的de變bian化hua,因yin為wei溶rong氧yang量liang的de減jian少shao將jiang影ying響xiang生sheng物wu體ti的de攝she食shi壓ya力li,並bing且qie有you機ji物wu質zhi的de累lei積ji也ye會hui影ying響xiang生sheng物wu需xu氧yang量liang。已yi有you研yan究jiu提ti出chu了le一yi個ge與yu低di溶rong解jie氧yang有you關guan的de飼si料liao投tou喂wei計ji劃hua。該gai計ji劃hua在zai早zao晨chen溶rong氧yang水shui平ping低di於yu3.0ppm時,減少或去除早期飼料投喂。若溶解氧是2.5-2.9ppm之間,飼料投喂量將會減少一半。若溶解氧低於2.5ppm,停止投喂。隨後中午測定的溶氧量將確定下次投喂時是否進行正常投喂。如果測定的溶氧量超過7.0ppm,那麼就可以投喂;如果在5.0-7.0ppm之間則投喂量減半,若溶解氧低於5.0ppm,那麼投喂暫停至第二天。當溫度低於25攝氏度時,飼料消耗量也會減少,因此測量需要適當的控製地點。
總結
飼si料liao投tou喂wei管guan理li是shi一yi個ge複fu雜za的de課ke題ti,會hui受shou許xu多duo因yin素su的de影ying響xiang,其qi中zhong一yi些xie可ke以yi人ren為wei控kong製zhi而er另ling一yi些xie則ze無wu法fa進jin行xing人ren為wei控kong製zhi。由you於yu許xu多duo變bian數shu在zai每mei一yi年nian中zhong都dou會hui發fa生sheng變bian化hua,所suo以yi在zai商shang業ye條tiao件jian下xia許xu多duo現xian象xiang、飼si料liao投tou喂wei量liang與yu蝦xia的de生sheng長chang是shi很hen難nan預yu測ce的de。因yin此ci,建jian議yi管guan理li人ren員yuan為wei了le更geng好hao的de提ti高gao養yang殖zhi體ti係xi而er多duo評ping估gu當dang前qian與yu過guo去qu的de養yang殖zhi情qing況kuang。在zai控kong製zhi投tou喂wei的de情qing況kuang下xia增zeng加jia飼si料liao投tou喂wei僅jin僅jin是shi增zeng加jia產chan量liang。在zai優you良liang的de養yang殖zhi體ti係xi中zhong應ying控kong製zhi飼si料liao的de投tou喂wei,這zhe將jiang可ke以yi使shi蝦xia能neng有you優you化hua利li用yong天tian然ran餌er料liao,減jian少shao汙wu染ran負fu荷he,一yi般ban能neng保bao持chi最zui高gao增zeng長chang率lv。如ru果guo蝦xia沒mei有you飽bao食shi,就jiu不bu太tai可ke能neng會hui浪lang費fei投tou入ru的de飼si料liao並bing且qie在zai體ti係xi中zhong不bu太tai可ke能neng會hui由you於yu營ying養yang過guo剩sheng而er造zao成cheng水shui質zhi汙wu染ran。
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