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1.
Luis Vargas-Chacoff Francisco J Arjona Ignacio Ruiz-Jarabo Inês Páscoa Odete Gonçalves María P Martín del Río & Juan Miguel Mancera 《Aquaculture Research》2009,40(11):1279-1290
Seasonal variations in osmoregulatory and metabolic parameters were assessed in juvenile gilthead sea bream ( Sparus auratus ) cultured in earthen ponds under a natural photoperiod and temperature. Specimens were sampled, and the plasma, gill, kidney and liver were collected during winter 2005 and 2006 (January), spring 2005 (April), summer 2005 (July) and autumn 2005 (October). Plasma osmoregulatory parameters showed higher values in summer, while metabolic parameters presented different patterns of variations. Gill Na+ ,K+ -ATPase activity decreased significantly in winter, while gill metabolite levels showed different patterns of variations among seasons. The enzymatic activities tested did not present a clear pattern of variation [(glutamate dehydrogenase (EC 1.4.1.2) (GDH) and hexokinase (EC 2.7.1.11) (HK)] or significant differences along seasons [glucose 6-phosphate dehydrogenase (EC 1.1.1.49)]. Kidney Na+ ,K+ -ATPase activity decreased during summer and autumn. Different patterns of variation were observed in kidney metabolite levels while all the enzymatic activities assessed [lactate dehydrogenase-oxidase (EC 1.1.1.27) (LDH-O), HK and GDH] presented the highest values during summer. In the liver, metabolite levels and enzymatic activities did not show significant variations or present clear patterns of variation along different seasons. These results indicated seasonal variations in the osmoregulatory and metabolic parameters of different organs (blood, gill, kidney and liver) in earthen pond-cultured gilthead sea bream ( S. auratus ), which could be mainly attributed to seasonal changes in temperature. 相似文献
2.
The present paper reports the results of a 1 year experiment using Atlantic salmon with a starting weight of 1.7 kg, and final weight of 7.4 to7.8 kg dependent of diet group. The experiment aimed to evaluate a direct production method of feed where landings from fishing vessels are used directly in feed processing. The dietary compositions followed the natural rhythm in lipid level of the catches of herring in the North Sea (Catch group) adjusted to be stable throughout one season only, and compared to a control diet (constant composition throughout the year) and a designed diet (opposite to the natural biorhythm of salmon lipid stores) (diet group Design). Four seasons were defined: spring (March, April, May), summer (June July August), autumn (September, October, November), winter (December, January, February). All diets varied in protein and lipid due to the adjustment according to season. The experiment was run in triplicate sea cages for each diet, using natural light and temperature regimes (21°N). All diet groups showed equal growth throughout each season, except for the Catch group during autumn showing lower SGR-values. SGR values varied significantly also between seasons for all diet groups, ranging from 0.29 during spring to 0.81 during autumn. Feed conversion ratio varied dependent on season and the dietary protein to energy ratio, at all seasons except winter. Quite a large variation between diet groups and seasons were registered in condition factor. Whole body lipid varied between seasons, as a consequence of dietary lipid levels, and increased as fish weight increased. After autumn growth only, whole body protein levels were significantly lower in the Catch group compared to the two other diet groups. Muscle lipid levels did not vary as a consequence of fish size alone, but varied substantially between seasons in both the Catch and Control groups, but not in the Design group. Muscle alpha-tocopherol and fatty acid profile varied due to diet in spring and autumn seasons, but with minor variations due to diet in summer and winter periods. Only minor influences from diet were registered in liver and heart compositions. Haematological parameters and plasma nutrient values ranged within normal values for salmon, and together with close to no mortality throughout the experiment, fish health was concluded to be good in all diet groups at all seasons. However, plasma asparagine aminotransferase (ASAT) values were quite high during summer and autumn, especially in the control group. These results point to the need of optimizing antioxidant composition of diets during the summer and early autumn season. Overall results show the possibility to obtain acceptable production results when feeding Atlantic salmon a diet adjusted to each season, as long as the fish protein to energy (P:E) requirements are met, further that total body lipid stores varied more than muscle lipid concentrations, and that the lipid levels were highly dependent on season, diet composition and fish size. 相似文献
3.
Daily and seasonal variations in haematological and blood biochemical parameters in the tench, Tinca tinca Linnaeus, 1758 总被引：2，自引：0，他引：2
Nuria de Pedro Ana Isabel Guijarro Marcos Antonio López-Patiño Rosa Martínez-Álvarez & María Jesús Delgado 《Aquaculture Research》2005,36(12):1185-1196
The purpose of the present study was to characterize daily variations in haematology and blood biochemistry in healthy male and female tench (Tinca tinca) in the four seasons of the year. Red blood cells, haematocrit and haemoglobin presented a similar daily profile in spring and summer, with high values during the scotophase. Total and differential types of leucocytes showed significant daily fluctuations, with a different pattern depending on the season and/or the type of leucocytes studied. A daily rhythm in plasma glucose and triglycerides was detected in winter, but significant changes in cholesterol concentrations were only detected in females during summer. The lowest mean level for triglycerides and cholesterol was observed in winter. The daily profile of plasma total proteins was similar in the four seasons, without a significant daily oscillation. All these daily and seasonal changes in haematology and blood biochemistry indicate that the time of the day and the season must be considered when such parameters are used for assessing the physiological status of the fish, and as biomarkers for disease and/or pollutant exposure. 相似文献
4.
Abdel-Hameid NA 《Fish physiology and biochemistry》2011,37(4):875-884
The lethal concentration for 50% of fish for 96h (96h LC50) of copper (Cu2+) was estimated for the Nile catfish (Clarias gariepinus) in extreme seasons, winter and summer, 4.31 and 4.79 mg/l, respectively. The Nile catfish was exposed to 96h LC50 of copper for 7 days in extreme winter and summer. The body indices, haematological parameters as well as some plasma and
liver enzyme activities and metabolite level were significantly differed in fish exposed to copper over than those of the
control fish. Most of the tested parameters were not significantly different between the control fish of winter and summer
(winter, water temperature 18 ± 2°C and summer, 27 ± 2°C). The effect of two ration sizes on copper toxicity in two different
seasons on C. gariepinus was justified. It was found that the haematological parameters and the tested plasma activities of enzymes were significantly
valid due to season differences. The blood parameters as well as plasma activities of enzymes were significantly differed
in fishes fed elevated ration (3%) and exposed to copper challenge. On the other hand, the exploit of low feeding ration (0.5%)
along with copper exposure during the examined seasons induced non-significant differences of the tested parameters, from
those of the corresponding control. Therefore, the low feeding ration provides some tolerance against the possible water-borne
copper exposure. 相似文献
5.
2003年夏季东海区带鱼资源状况及其秋冬汛渔况的分析 总被引：4，自引：0，他引：4
根据东海区渔业资源动态监测网调查资料,对2003年伏季休渔期间的带鱼资源状况进行了分析,并展望了秋冬汛带鱼生产前景。结果表明,2003年伏季休渔前期(6月),东海区带鱼资源重量密度、资源尾数密度及发生量均比常年偏低、产卵期个体重量较常年偏大,亲鱼量属低水平年份;伏季休渔中期(7月、8月),带鱼的产卵群体比例下降,个体平均肛长偏小。同时,海区的水温较2002年偏低,不利于带鱼生长和发育。预计伏季休渔结束后,渔获状况不容乐观,秋冬汛生产前景将差于2002年。 相似文献
6.
为了解流溪河光倒刺鲃国家级水产种质资源保护区鱼类群落结构,分析不同河段、不同季节鱼类群落多样性的变化,于2017年12月-2018年10月对保护区上、中、下游的鱼类开展了每个季度一次的调查。调查结果显示,共采集鱼类57种,隶属于5目14科50属,其中鲤形目43种、鲈形目6种、鲇形目5种,合鳃鱼目2种,鳉形目1种;计算57种鱼类的相对重要性指数,结果显示,尼罗罗非鱼、越南■及鲤鱼为2017-2018年度优势种;Shannon-Wiener多样性指数、Margalef丰富度指数和Pielou均匀度指数计算结果显示,下游鱼类群落的多样性及均匀度最高,夏季鱼类群落的多样性、丰富度及均匀度最高;各监测点之间的种类相似性系数显示,保护区上中游、上下游之间鱼类种类组成为中等不相似,中下游种类组成为中等相似,春夏、春冬、夏冬及夏秋季节鱼类种类组成为中等不相似,春秋、秋冬季节为中等相似;ABC分析结果显示,春、夏及冬季鱼类群落处于稳定状态,秋季处于中度干扰状态。 相似文献
7.
Antenor Aguiar Santos Mizue I. Egami Maria Jos T. Ranzani-Paiva Yara Juliano 《Aquaculture (Amsterdam, Netherlands)》2009,296(3-4):359-366
The objective of this work was to determine hematological parameters and the phagocytic capacity of peritoneal macrophages of the fat snook related to sex, stage of gonadal maturation and seasonal cycle. The hematological results did not show significant differences between males and females. With respect to stage of gonadal maturation, only erythrocytes numbers (RBC), in females, was found to be significantly elevated in stage III (maturing) and decreased in V (spent). An analysis of the results of the erythrocyte and leukocyte series, thrombocytes and phagocytic activity related to sex and seasonal cycle showed statistically significant differences: a) hematocrit (Ht) and hemoglobin concentration (Hb) were elevated in the spring and low in the winter in males; b) mean corpuscular volume (MCV) was high in the spring and summer and low in the fall in both sexes; c) thrombocytes numbers were elevated in the fall and low in the other seasons in females; d) phagocytic capacity (PC) and phagocytic index (PI) were higher in the summer and lower in the fall in females. The results showed that spring and summer correspond to seasons of the year for better hematological and phagocytic responses for survival of the fat snook in its natural habitat. The parameters studied could be utilized for evaluation of the health status fat snook in its own habitat or in captivity. 相似文献
8.
Murzina SA Meyer Ottesen CA Falk-Petersen S Hop H Nemova NN Poluektova OG 《Fish physiology and biochemistry》2012,38(5):1393-1407
Oocyte and liver histomorphology of the daubed shanny (Leptoclinus maculatus) from Isfjorden and Kongsfjorden in Svalbard were investigated during three Arctic seasons: summer (July), autumn (October) and winter (April). Three oocyte developmental phases were observed: primary growth phase, secondary growth phase and maturation phase. We observed four different developmental stages: (1) perinucleolus stage with cortical alveolus formation, (2) lipid droplets formation, (3) vitellogenesis stage and (4) maturation. Late maturation stage of oocytes in the ovaries was from the autumn season. Females accumulated lipids in liver (up to 35.2?% dw) and deposited large amounts of lipids into gonads (up to 52.2?% dw) during maturation. Lipid classes in female gonads changed seasonally, with relative increase in cholesterol during summer and depletion of storage lipids (triacylglycerols and wax esters/cholesterol esters) during the winter. Lipid composition in liver changed during oocyte development and spawning, as neutral lipids were transferred to developing oocytes during summer to autumn. During winter, storage lipids were depleted during starvation. Based on the increase in gonadosomatic index (GSI) with length and observed maturation stages, females seem to mature at a length of about 125-130?mm. The GSI and hepatosomatic index of large females sampled in autumn (September-October) were significantly higher than for females in late winter (April) and spring (May). These results indicate that spawning takes place during winter in Isfjorden and that energy reserves stored in the liver are utilized by females during gonadal development and reproduction. 相似文献
9.
采用大连湾海域四季底拖网调查数据(2006年夏、冬季和2007年春、秋季),对其鱼类群落结构进行研究,并利用多样性指数法和丰度/生物量比较法(ABC曲线)评价鱼类群落受外界扰动的程度。研究结果表明,该海域四季共采集鱼类31种,隶属于10目24科31属,鱼类区系组成在适温性上以暖温性鱼类为主,在栖息水层上以底层鱼类为主。夏季鱼类生物量(43.16kg/h)和生物数量(950个/h)均明显高于其他3个季节。四季共有优势种为大泷六线鱼和许氏平鲉。鱼类群落多样性指数季节变化范围分别为物种丰富度指数0.76~2.16、多样性指数0.63~1.96、物种均匀度指数0.36~0.91。各季节间生物量和丰度组成的Bray-Curtis相似性均较高。多样性指数法和丰度/生物量曲线法对鱼类群落受外界扰动评价结果一致,均表明鱼类群落受到中度扰动,且秋冬季高于春夏季。本研究可为大连湾海湾生态系统健康评价和生态修复提供科学依据。 相似文献
10.
为了解流沙湾养殖活动对浮游动物群落的影响,于2015—2016年对流沙湾海区进行了夏(8月)、秋(11月)、冬(2月)、春(5月)4个季度的浮游动物调查,分析了浮游动物群落特征及其与环境因子的相关性。共记录浮游动物18大类119种、浮游幼体17种。浮游动物种类组成以桡足类(45种)和端足类(20种)为主,其次为毛颚类(15种)、水螅水母类(12种)、等足类(6种)等。十足目幼体(Decapod larvae)为春、夏两季的主要优势类群,亚强次真哲水蚤( Subeucalanus subcrassus)、微驼隆哲水蚤(Acrocalanus gracilis)为秋季主要优势种,夜光虫(Noctiluca scintillans )为冬季主要优势种。年均浮游动物丰度和生物量分别为151.53个·m^-3 和73.48 mg·m^-3 。多维尺度分析(nMDS)结果表明,除春季外,流沙湾内湾浮游动物群落组成与外湾差异明显。典范对应分析(CCA)显示,溶解氧、磷酸盐、透明度、温度和硝酸盐等环境因子是影响浮游动物优势种分布的主要因素。在流沙湾海区,鱼类小网箱的养殖活动在夏秋两季对浮游动物群落组成和结构影响较大;贝类养殖区的浮游动物的丰度和生物量明显降低,但浮游动物群落组成及多样性与其它采样点差异不大。 相似文献
11.
根据2006年黄海中南部4个季度月(1、4、8、10月)的渔业资源调查资料,运用定性、定量的方法分析了黄海中南部鱼类群落的种类组成、时空生态位宽度、时空生态位重叠以及优势种的季节变化,以期对该海域主要鱼种的生态位特征进行分析。结果表明,4个航次总共有鱼类57种,其中冬季39种,春季42种,夏季31种,秋季40种。4个航次共有相同鱼种22种,隶属于14科20属。时空生态位宽度值大于1的10个鱼种从大到小依次为黄鱼安鱼康Lophius litulon、小黄鱼Pseudosciaenapolyactis、银鲳Pampus argenteus、七星底灯鱼Benthosema pterotum、小带鱼Trichiurus muticus、虻鲉Erisphex pottii、细纹狮子鱼Liparis tanakae、星康吉鳗Conger myriaster、白姑鱼Argyrosomusargentatus、带鱼Trichiurus haumela。这10种主要鱼类的生物量变动在黄海中南部受季节变化的影响是递增的。细纹狮子鱼与星康吉鳗的时空生态位重叠值最大,小带鱼与星康吉鳗的时空生态位重叠值最小。生态位宽度与相对重要性指数(IRI)相比,时空生态位宽度值最大的是黄鱼安鱼康,而IRI值最大的是鳀鱼,通过二者计算所得到主要鱼种在群落中的重要性排序不同。作者认为,生态位宽度与相对重要性指数(IRI)相比,能够更加全面的反映鱼类生物量在不同时间和空间尺度上的均匀度和变化情况。 相似文献
12.
东海区太平洋褶柔鱼生殖群体结构特征的季节差异 总被引：2，自引：0，他引：2
依据1997~1999年东海区春、夏、秋3个季节的底拖网资料,分析了东海区太平洋褶柔鱼生殖群体的性别组成、性腺成熟度和初次性成熟胴长等群体结构特征。结果表明:在东海区春、夏、秋三季均存在太平洋褶柔鱼的生殖群体。各季节生殖群体的雌雄比例均不符合1∶1的关系(P<0.05),雌性比例小于雄性。生殖群体中性成熟个体胴长的季节性变化较为明显,雌、雄平均胴长均以秋季最大,夏季最小。雌性个体的平均胴长均显著大于雄性。各季节太平洋褶柔鱼生殖群体中胴长与体重关系的性别差异极显著(P<0.01)。此外,不同季节雌、雄太平洋褶柔鱼的初次性成熟胴长差异较大,雌性为:春季223.4 mm、夏季170.4 mm、秋季202.3 mm;雄性为:春季174.0 mm、夏季164.3 mm、秋季165.3 mm。雄性初次性成熟胴长小于雌性,夏季雌、雄初次成熟胴长均小于春、秋季。依据春季生殖群体的胴长范围、初次性成熟胴长等群体结构特征推测,在东海区可能存在着小规模的春生群。 相似文献
13.
长江口渔场渔业生物群落结构的季节变化 总被引：18，自引：4，他引：18
利用2000～2002年在长江口渔场的底拖网调查资料,运用多样性指数和相似性指数,对该水域的渔业生物群落结构季节变化进行了研究。结果表明:该域的渔业生物群落以鱼类为主要生物类群,占有绝对优势;甲壳类和头足类为其次要组成部分,处于生态劣势。群落生物量以秋季最大,春季最小。渔业生物群落的丰度、多样性以及均匀度以春冬季较高,夏秋季较低,造成这种趋势的原因可能是与带鱼(Trichiurusjaponicus)和小黄鱼(Larimichthyspolyactis)的洄游有关。渔获物组成春冬季之间、夏秋季之间的相似性指数较高。 相似文献
14.
为进一步探明长江口沿岸碎波带仔稚鱼种类组成和数量分布的季节性变化特征,2006年11月至2007年10月,在长江口沿岸碎波带的13个站位用小型拖网(1 m×4 m,网目1 mm)共采集到仔稚鱼77种,隶属于13目27科63属。各季节出现仔稚鱼种数分别为37、20、13和7种。仔稚鱼是以暖温性种类占绝对优势,按生态类型划分,河口性和淡水性种类为主,其次为海洋性种类,洄游性种类最少。根据优势度曲线可看出,夏季优势种最突出,秋季优势种最不明显。夏季与秋季的共有种最多,均为27种;冬季与春季,冬季与秋季间的共有种最少,均为11种。从数量分布来看,冬季仔稚鱼数量最少,且分布较分散,春季数量有明显增加,夏季数量达最大值,且分布趋于集中。在低盐和淡水的站位St.4、St.5、St.7和St.10,形成了以刀鲚为主要种类的仔稚鱼密集区,平均密度高达2 729尾/站。 相似文献
15.
根据2012年1月(冬季)、4月(春季)、8月(夏季)、11月(秋季)在北部湾西北部广西近海4个航次的渔业资源调查资料,进一步结合同步测定的水文情况,探讨北部湾西北部广西近海的鱼类资源分布特征和季节变化及其影响因素。调查结果表明,该调查海域共鉴定鱼类125种,鱼类资源质量密度夏季(402.46kg/km^2)>春季(343.22kg/km^2)>秋季(145.13kg/km^2)>冬季(53.99kg/km^2);尾数密度春季(84.34×10~3尾/km^2)>夏季(51.54×10~3尾/km^2)>秋季(26.53×10~3尾/km^2)>冬季(16.81×10~3尾/km^2);平均体长、体质量分别在春季和夏季最大,分别为7.15cm和7.65g;幼体比在夏季最高,为85.86%。从时间上看,春、夏季的鱼类资源密度大于秋、冬季,从空间上看,沿岸水域的资源密度大于近海水域,这与该水域各水团随季节变化的消长密切相关。依据相对重要性指数确定各季节的优势种,二长棘鲷是夏季最重要的优势种,同时也是春、夏、秋3季的共有优势种。通过贡献率β值可知,该区域鱼类总密度变化与主要优势种变化关系密切,且调查海域多为规格较小的幼鱼,其为北部湾渔场重要的产卵场、育幼场和索饵场,对整个北部湾鱼类资源的补充具有重要的作用。 相似文献
16.
根据2005年和2006年逐月在胶州湾进行的底拖网调查,并对底拖网渔获物中的头足类进行定性定量分析与测定,利用扫海面积法评估胶州湾海域曼氏无针乌贼的资源量。调查分析了其分布特点与季节变化,并进行了渔获物中头足类组成的比较,分析了其种类组成、分布特点与季节变化特征。结果表明,胶州湾曼氏无针乌贼资源量有明显的季节变化,夏、秋两季的资源量明显高于其他季节,分别达到26.7t和21.5t（2006）;夏、秋两季的重量比明显高于其他季节,分别达到23.4%和27.8%。近几年,以曼氏无针乌贼为主捕对象的头足类资源量基本保持稳定,年平均资源量约14t,接近20世纪90年代中期的水平。 相似文献
17.
流沙湾是中国海水珍珠“南珠”的主产区和广东省重要的贝类养殖区。为评估湾内养殖活动的环境效应,于2015~2016年对流沙湾海区进行了夏(8月)、秋(11月)、冬(2月)、春(5月) 4个季节的浮游植物和海水理化因子调查。共检出浮游植物171种,包括硅藻门43属122种、甲藻门 10属44种、蓝藻门2属2种、金藻门2属2种和裸藻门1属1种。流沙湾内湾浮游植物细胞丰度为(0.05~79.04)×104个/L,夏季>春季>秋季>冬季,且夏季丰度远大于其他三季,内湾和外湾差异不显著。春季须状角毛藻(Chaetoceros crinitus)、红海束毛藻(Trichodesmium erythraeum)和明壁圆筛藻(Coscinodiscus debilis)为主要优势种,夏季优势种主要为中肋骨条藻(Skeletonema costatum),秋季优势种主要为拟弯角毛藻(Chaetoceros pseudocurvisetus)、奇异棍形藻(Bacillaria paradoxa)、洛氏角毛藻(Chaetoceros lorenzianus),冬季主要优势种为威氏圆筛藻(Coscinodisus wailesii)、柔弱根管藻(Rhizosolenia delicatula)、岛脆杆藻(Fragilaria islandica)。其中,奇异棍形藻为春、秋、冬季的优势种,红海束毛藻为春、夏、秋季的优势种。冗余分析表明,流沙湾浮游植物优势种在春季与水温和氨氮密切相关,夏季受透明度显著影响,而在秋、冬季受亚硝酸氮含量影响显著。流沙湾不同养殖区的浮游植物多态性和丰度有明显季节差异。与2012年相比,流沙湾外湾的养殖覆盖率提高了近50%,内湾的珍珠贝养殖减少了近90%,养殖品种、规模和分布格局都发生了明显变化,目前流沙湾的浮游植物群落特征正是对其变化的一种响应。夏季鱼类网箱养殖提高了水域营养盐水平并降低了浮游植物多样性。大规模的扇贝养殖则导致了扇贝养殖区浮游植物丰度的降低。 相似文献
18.
Changes in rheological properties of grass carp fast skeletal myosin induced by seasonal acclimatization 总被引：1，自引：0，他引：1
To elucidate the effects of seasonal temperature acclimatization on thermal gelation of grass carp myosin, myosins from fish
in different seasons were prepared and investigated for the changes in dynamic viscoelastic parameters including storage modulus
(G′), loss modulus (G″) and damping factor (tan δ) upon heating. Myosins from fish in spring and summer had a temperature
region of 38–44°C for the first marked increase of G′ higher than that of myosins from fish in autumn and winter (28–33°C).
The measurement temperature-dependent changes in dynamic viscoelastic parameters such as G″ and tan δ were also different
among the four myosins. While gel formation was observed with the spring and summer myosins, apparently in two steps, three
steps were found in the autumn myosin. Furthermore, the winter myosin exhibited more than three steps for gel formation. These
differences in rheological properties among the four myosins were considered to be attributed to the differences in thermodynamic
and structural properties of these myosins previously reported. 相似文献
19.
为了解黑棘鲷(Acanthopagrus schlegeli)在大亚湾生态系统食物网结构中的地位和作用, 2018 年 3 月至 2019 年 1 月逐月在大亚湾采集黑棘鲷样本, 分析黑棘鲷的食性组成、摄食强度、生态位宽度以及食性随季节和体长变化的趋势。结果表明, 大亚湾黑棘鲷饵料生物组成主要包括藤壶、鱼类、贝类、蟹类、虾类、星虫类、头足类、 水生植物等 8 个类群, 相对重要性指数百分比(IRI%)表明藤壶是最重要的饵料类群(IRI%为 42.41%), 其次依次是鱼类、贝类、蟹类、虾类、星虫类、头足类和水生植物。大亚湾黑棘鲷全年均有摄食, 摄食强度随季节变化显著, 其中胃饱满指数以春、冬季较高, 夏、秋季较低; 而空胃率则以夏季显著高于其他季节。不同季节食性差异明显, 春季主要以藤壶为食, 夏季主要以鱼类为食, 秋季主要以贝类为食, 冬季则主要以藤壶和鱼类为食, 影响食性组成随着季节变化的主要因子为水温、食物资源的可获得性等; 黑棘鲷体长越长, 越倾向于摄食大个体饵料, 摄食强度也越大, 营养生态位宽度先宽后窄。本研究结果将为今后黑棘鲷的保护和人工养殖提供理论依据。 相似文献
20.
荣成俚岛斑头鱼摄食生态研究 总被引：2，自引：0，他引：2
2010年3月至2011年2月逐月采集荣成俚岛近海的743尾斑头鱼(Hexagrammos agrammus),探讨其摄食生态特征。结果表明,斑头鱼为底栖生物食性鱼类,摄食的饵料生物包括11个类群,主要摄食多毛类(Polychaeta),其次是鱼卵、海藻类、海草类、口足类(Stomatopoda)、端足类(Amphipoda)和鱼类等。食物组成随季节和体长而变化:除四季均大量摄食多毛类以外,春季还摄食口足类和虾类,夏季还摄食鱼类和蟹类,秋季还摄食鱼卵和鱼类,冬季摄食鱼卵比例最高;体长80 mm的斑头鱼喜食海草和海藻等植物性饵料,体长80~199 mm的个体喜食多毛类、鱼类和虾蟹类等,体长199 mm的个体主要摄食鱼类、多毛类和鱼卵等。摄食强度也随季节和体长而变化:夏季摄食强度最高,春季和秋季次之,冬季最低(不停食);体长100 mm的个体摄食强度最高,随着体长增加而逐渐下降,体长180 mm以上的个体又随体长和年龄的增大而逐渐升高。对斑头鱼5个饵料生物样品进行了DNA条形码鉴定,其中4个饵料生物样品鉴定到种,1个饵料生物样品鉴定到属。结论认为,斑头鱼的摄食习性会随季节、个体生长和栖息海域饵料生物的种类和丰度的不同而发生变化。 相似文献