三门湾春秋季鱼类群落特征及其与环境因子的关系

根据2014年11月(秋季)和2015年5月(春季)在三门湾进行渔业资源调查以及同步调查的6个主要环境因子数据(水温、盐度、悬浮物、p H、溶解氧及化学需氧量等),对三门湾鱼类群落结构及其与6个主要环境因子的关系进行了研究。结果显示,共捕获鱼类33种,其中以季节性洄游种类和暖水性种类为主。春、秋季优势种各有5种,其中棘头梅童鱼、龙头鱼和孔虾虎鱼为共同优势种。应用非度量多维测度分析(NMDS)和单因子相似性分析(ANOSIM)可得,春、秋鱼类群落均可划分为2组,其中1组主要分布在湾内,而另1组主要分布在湾口,在不同站位组间均存在极显著差异。长度谱分析结果显示,鱼类群落长度谱的斜率和截距有明显的季节性差异。RDA分析结果表明,鱼类群落主要受温度、溶解氧、悬浮物和p H等环境因子影响。     

Microhabitat differences in crab assemblage structures in a subtropical mangrove estuary on Iriomote Island,southern Japan

Crab assemblage structures in sandy flat, muddy flat and mangrove forest microhabitats in a mangrove estuary of the Urauchi River, Iriomote Island, southern Japan, differed clearly among the three microhabitats, species and individual numbers being greater inside the mangrove forest than on the flats. A similarity index showed distinct differences in species composition among the microhabitat assemblages, primarily due to the differential distributions of dominant species, such as the soldier crab Mictyris guinotae, sentinel crab Macrophthalmus convexus and sesarmid crab Perisesarma bidens. A canonical correspondence analysis indicated that the differences likely arose from among-microhabitat differences in the physical environment, the mangrove forest being characterized mainly by structurally complex mangrove roots, lower soil porewater temperatures and higher relative substrate elevation, the sandy flat by lower organic content of the sediment and higher porewater oxygen amount, and the muddy flat by higher levels of sediment water and organic material. The findings suggested that microhabitat-related physical differences are important factors determining crab distribution patterns in mangrove estuaries.     

Effects of mangrove deforestation on fish assemblage at Pak Phanang Bay,southern Thailand

Daytime sampling using a seine net was conducted at Pak Phanang Bay (Nakhon Si Thammarat Province, Thailand) in February and July 2006, to determine differences in fish assemblage structures between a mangrove site and an adjacent site completely cleared of mangroves. The overall numbers of fish species and individuals were significantly higher at the mangrove site than the cleared site in both months. Although benthic crustacean feeders showed more species and individual numbers at the mangrove site in both months, the opposite was found for zooplankton feeders. A cluster analysis, based on the abundance of each species, demonstrated that the fish assemblage structures were distinctly different between the two sites. In addition, significant differences in length frequency distributions for each of the four most abundant species were found between the sites in February and/or July. Small individuals of Scatophagus argus, Ambassis nalua, and Tetraodon nigroviridis were more common at the mangrove site, and of Chelon subviridis at the cleared site. These results suggest that mangrove deforestation exerts marked effects on fish assemblages.     

Microhabitat preferences of fish assemblages in the Udzungwa Mountains (Eastern Africa)

Environmental flow assessment (EFA) involving microhabitat preference models is a common approach to set ecologically friendly flow regimes in territories with ongoing or planned projects to develop river basins, such as many rivers of Eastern Africa. However, habitat requirements of many African fish species are poorly studied, which may impair EFAs. This study investigated habitat preferences of fish assemblages, based on species presence–absence data from 300 microhabitats collected in two tributaries of the Kilombero River (Tanzania), aiming to disentangle differences in habitat preferences of African species at two levels: assemblage (i.e. between tributaries) and species (i.e. species‐specific habitat preferences). Overall, flow velocity, which implies coarser substrates and shallower microhabitats, emerged as the most important driver responsible of the changes in stream‐dwelling assemblages at the microhabitat scale. At the assemblage level, we identified two important groups of species according to habitat preferences: (a) cover‐orientated and limnophilic species, including Barbus spp., Mormyridae and Chiloglanis deckenii, and (b) rheophilic species, including Labeo cylindricus, Amphilius uranoscopus and Parakneria spekii. Rheophilic species preferred boulders, fast flow velocity and deeper microhabitats. At the species level, we identified species‐specific habitat preferences. For instance, Barbus spp. preferred low flow velocity shallow depth and fine‐to‐medium substratum, whereas L. cylindricus and P. spekii mainly selected shallow microhabitats with coarse substrata. Knowledge of habitat preferences of these assemblages and species should enhance the implementation of ongoing and future EFA studies of the region.     

Species composition and diversity of fish larvae in the Subtropical Convergence Zone of the Sargasso Sea from morphology and DNA barcoding

Specific regions of otherwise oligotrophic oceans seem to attract fish spawning and sustain significant abundances of fish larvae. The Sargasso Sea in the North Atlantic subtropical gyre is known as the spawning area of the Atlantic eels, but numerous other fish species also spawn in the area. In order to evaluate spatial variability of larval fish in the region, we examined species diversity, composition and abundances at eight stations in the Subtropical Convergence Zone (STCZ) using morphological identification and DNA barcoding. From a total of approximately 3500 specimens collected, at least 154 species from 50 families could be identified. The family Myctophidae had the highest species richness, with at least 32 species represented. The myctophids Lepidophanes gaussi, Bolinichthys indicus, Notolychnus valdiviae and Ceratoscopelus warmingii were the four most abundant species. Other common species included the three eels: Nemichthys scolopaceus, Ariosoma balearicum and Anguilla anguilla. Larval fish species composition differed substantially between the relatively closely spaced stations on either side of prominent hydrographic fronts in the study area, presumably because of the strong environmental gradients. Common eel species were concentrated between the fronts whereas common myctophids were of highest abundance at the outer edges of the fronts. The abundances of most species were generally enhanced in the vicinity of the fronts. The use of combined morphological and DNA‐barcoding identification methods facilitated species identification, and we could document substantially higher levels and a larger degree of spatial variability in species diversity of fish larvae than previously shown for oligotrophic ocean areas.     

Microdistribution and feeding dynamics of Coilia nasus (Engraulidae) larvae and juveniles in relation to the estuarine turbidity maximum of the macrotidal Chikugo River estuary,Ariake Sea,Japan

To evaluate the nursery value of the estuarine turbidity maximum (ETM) for the anadromous engraulid fish Coilia nasus, physical and biological samples were collected along the macrotidal Chikugo River estuary, southwestern Japan, from June 2005 to January 2006. Generally, eggs were distributed upstream of the ETM, whereas larvae were distributed in the ETM. The first cohort was washed out of the estuary by a large flood in early July. The second cohort appeared after the flood, gradually extending its distributional area through the estuary and growing to 100 mm in standard length (SL) by December. Larvae and juveniles (20–100 mm SL) fed selectively on copepods, specifically large calanoid species, whereas more developed juveniles fed on mysids. Prey organisms in guts were significantly more abundant and present in greater weights in the ETM (salinity <10) than in the lower estuary (salinity >10). The better feeding conditions were primarily attributable to consistently high densities of two large calanoid species, Sinocalanus sinensis and Pseudodiaptomus inopinus, in the ETM. In contrast, the poor feeding conditions in the lower estuary were likely due to a seasonal decrease in copepod density and the dominance of small copepods such as Oithona spp. Given that better feeding conditions contribute positively to the growth and survival of larvae and juveniles, we conclude that the ETM has a significantly higher nursery value for C. nasus compared with other habitats in the Chikugo River estuary.     

Molecular identification and distribution of mangrove oysters ( Crassostrea) in an estuarine ecosystem in Southeast Brazil: implications for aquaculture and fisheries management

This study investigated the existing species of Crassostrea in the natural environment, farming systems and artificial spat collectors at a protected estuarine area in Brazil, through PCR‐RFLP of mitochondrial 16S rRNA. Among 450 samples collected in the natural environment, 303 were C. brasiliana and 147 C. rhizophorae. Oysters present in the rocky subtidal zone were C. brasiliana. However, both species occurred on mangrove roots in the intertidal zone. Farm‐raised samples included only C. brasiliana. It was observed that attached specimens in commercial collectors had a banding pattern distinct from C. brasiliana and C. rhizophorae, indicating the presence of a third species in the estuary. The 16S rRNA sequence analysis showed that these specimens are clustered with the oysters from Pacific and Indian Oceans, and genetically close to the oysters of Beihai, China (0.3% genetic distance). Oysters obtained from the seed capture showed 17.8% distance of in relation to C. brasiliana, 17.6% for C. rhizophorae and 10.3% for C. gigas, demonstrating high genetic divergence from these species. The occurrence of an exotic species in the Cananéia estuary may have strong ecological and economic implications which require new guidelines for farming, conservation and sustainable fisheries management for the native oyster species.     

Investigation of the Negombo estuary (Sri Lanka) brush park fishery, with an emphasis on community-based management

The Negombo estuary brush park fishery in Sri Lanka was investigated from June 1998 to March 1999. The mean fish yield (all species) in the fishery was 12.46 t ha⁻¹ yr⁻¹. Fin fish species formed about 91% of the yield and the rest was formed by penaeid shrimps and crabs. Fish yield and the twig density in the brush park exhibited a second order polynomial relationship indicating a minimum yield at an intermediate value of twig density in the brush parks. The relationship between fish yield and duration of implantation of brush parks showed an optimal period of 30–40 days for high fish yields. Income levels of fishermen, availability of construction material and suitable sites for implantation of brush parks are some of the factors determining size and number of brush parks per fisherman and duration of installation. Indigenous knowledge within the fishing community about the effect of salinity variations, twig density and mangrove species used on the harvests greatly contribute to effective operation of this fishing practice. Cultivation of mangroves to obtain twigs and branches is a unique feature in this estuary. Indigenous knowledge on mangroves has led to the adoption of sound silvicultural practices. Although cultivating mono-specific mangrove stands may not increase diversity of mangrove forests, it reduces denudation of naturally occurring mangrove forests because of brush park construction, and retains habitats for other organisms. Mangrove management plans in the Negombo estuary should therefore be viewed and treated in an integrated manner that takes into account both resource and social components.     

岱衢洋产卵场鱼卵、仔稚鱼群落结构及其与环境因子的关系

为了解岱衢洋海域鱼卵、仔稚鱼的群落结构及其与环境因子的关系,本团队分别在2010年5月—2012年2月春、夏、秋和冬季,利用大型浮游生物网在此海域开展了8个航次调查。共采集到鱼卵1 042粒,仔稚鱼2 055尾,隶属于10目19科37种。鱼卵优势种为扁舵鲣和小带鱼等;仔稚鱼的优势种为鰉、鳀和中华小公鱼等。调查海域鱼卵的平均密度是8.40粒/100 m3,仔稚鱼的平均密度是14.85尾/100 m3。单因素方差分析结果显示,2010年和2011年春、夏季4个季节之间丰富度指数(D)、均匀度指数(J′)和多样性指数(H′)均存在极显著差异。鱼卵、仔稚鱼资源密度分布不均匀,春、夏季较高,冬季最低,大体呈现南高北低的趋势。Pearson相关性结果分析得出,与鱼卵、仔稚鱼关系最密切的环境因子为温度、盐度和海水悬浮物。研究表明,春、夏季是岱衢洋海域鱼类产卵的重要时期,该海域是鳀、扁舵鲣、中华小公鱼等中上层鱼类的重要产卵场和育幼场。     

Mud crab pen culture: replacement of fish feed requirement and impacts on mangrove community structure

Brackishwater pond culture has been a major factor in mangrove loss in Southeast Asia, hence, the need to develop environment‐friendly technologies such as mud crab Scylla (Portunidae) culture in mangrove pens exists. This study evaluated the effects of mud crab netpen systems in central Philippines on mangrove macroflora, and the replacement of dietary fish with low‐cost pellets. Wild or hatchery‐sourced Scylla olivacea and Scylla serrata were stocked at 0.5–0.8 m⁻² in 167–200 m² nylon netpens (2.3 cm stretched mesh) in Avicennia‐dominated mangrove habitats. The feeding treatments were: (A) Zarraga: (1) no feeding (natural productivity), (2) no feeding for 1 month+supplementary feeding, (3) fish biomass and (4) low‐cost pellets, and (B) Batan: (1) fish biomass and (2) pellets+fish biomass. Feeds were given ad libitum twice daily. Growth and survival rates of S. olivacea in Zarraga pens were not significantly different among treatments, although crabs fed fish biomass had the highest survival, body weight and production. Similarly, growth and survival of S. serrata were not significantly different between the Batan treatments. Economic analysis of the latter gave a 38.5% return on investment (ROI) and 2.6 years payback period (PP) for pellets+fish biomass treatment compared with 27.5% ROI and 3.6 years PP for fish alone. Sensitivity analysis showed an improved economic performance of the pellets+fish biomass treatment by increasing the survival rate. Evaluation of mangrove community structure showed that crab culture reduced species diversity, numbers and biomass of seedlings and saplings, but not of mangrove trees. Therefore, mud crab pen culture is recommended for mangrove sites with mature trees, but not seedlings and saplings, and low‐cost pellets can reduce dependence on fish biomass.     

Food habits of fishes in the mangrove estuary of Urauchi River,Iriomote Island,southern Japan

The food habits of 67 fish species collected from the mangrove estuary of the Urauchi River, Iriomote Island, southern Japan were investigated using gut content analysis. Ontogenetic changes in food preference were recognized in nine species, including mugilids, gerreids, mullids, gobiids and tetraodontids. In most cases, juveniles of these species fed mostly on small crustaceans (e.g. calanoid and cyclopoid copepods and gammaridean amphipods) or detritus. With their subsequent growth, larger prey items (e.g. crabs and polychaetes) became dominant. A cluster analysis based on dietary overlaps showed that the mangrove fish assemblage comprised eight trophic groups (zooplankton, small benthic crustacean, large benthic crustacean, polychaete, fish, detritus, plant and insect feeders). Of these, large and small benthic crustacean feeders, which consumed mainly crabs and gammaridean amphipods, respectively, were the most abundantly represented in terms of species, whereas polychaete and insect feeders were each represented by only two species.     

不同时空尺度下黄河口及其邻近水域鱼类群落谱系结构

为探究不同时空尺度下黄河口及其邻近水域鱼类群落谱系结构的分布格局以及多样性的维持机制, 根据 2013 年 6 月、7 月、8 月、10 月和 2014 年 2 月、4 月和 5 月在黄河口及其邻近水域开展的 7 个航次的鱼类资源调查数据, 基于鱼类系统发育关系, 分别以各月份黄河口及其邻近水域的鱼类群落、全年和不同月份在各个站位上出现的鱼类为目标群落, 应用净亲缘关系指数分析了该海域鱼类群落谱系结构的时空变化, 并探讨了影响群落构建的主要因素。结果表明, 在黄河口及其邻近水域, 鱼类群落谱系结构在 2 月、4 月呈现发散状态, 竞争排斥可能是影响鱼类群落构建的主导因素; 在其他月份均为谱系聚集状态, 生境过滤可能是鱼类群落构建的主导因素。在站位尺度上, 从全年来看, 入海口处的站位点鱼类群落呈现为谱系发散, 竞争排斥起着主导作用, 而其他站位鱼类群落谱系结构表现为谱系聚集, 生境过滤为主要驱动因素; 在各月份中, 站位间鱼类净亲缘关系指数变化较小, 除 2 月和 4 月外, 各月份中多数站位上鱼类群落表现为谱系聚集, 生境过滤起着主导作用。不同时空尺度下, 黄河口及其邻近水域鱼类群落有不同的物种组成和谱系结构; 在较大时空尺度下, 生境过滤对鱼类群落谱系结构起主导作用, 而在较小时空尺度下竞争排斥则是主要影响因素。     

Natural outbreak of Streptococcus agalactiae (GBS) infection in wild giant Queensland grouper, Epinephelus lanceolatus (Bloch), and other wild fish in northern Queensland, Australia

Ninety‐three giant Queensland grouper, Epinephelus lanceolatus (Bloch), were found dead in Queensland, Australia, from 2007 to 2011. Most dead fish occurred in northern Queensland, with a peak of mortalities in Cairns in June 2008. In 2009, sick wild fish including giant sea catfish, Arius thalassinus (Rüppell), and javelin grunter, Pomadasys kaakan (Cuvier), also occurred in Cairns. In 2009 and 2010, two disease epizootics involving wild stingrays occurred at Sea World marine aquarium. Necropsy, histopathology, bacteriology and PCR determined that the cause of deaths of 12 giant Queensland grouper, three wild fish, six estuary rays, Dasyatis fluviorum (Ogilby), one mangrove whipray, Himantura granulata (Macleay), and one eastern shovelnose ray, Aptychotrema rostrata (Shaw), was Streptococcus agalactiae septicaemia. Biochemical testing of 34 S. agalactiae isolates from giant Queensland grouper, wild fish and stingrays showed all had identical biochemical profiles. The 16S rRNA gene sequences of isolates confirmed all isolates were S. agalactiae; genotyping of selected S. agalactiae isolates showed the isolates from giant Queensland grouper were serotype Ib, whereas isolates from wild fish and stingrays closely resembled serotype II. This is the first report of S. agalactiae from wild giant Queensland grouper and other wild tropical fish and stingray species in Queensland, Australia.     

Seasonal dynamics of habitat use by an airbrathing catfish (Claris liocephalus) in a papyrus swamp

I examined the effects of extreme hypoxia and water level fluctuations on the distribution and movement of an air-breathing clariid catfish, Clarias liocephalus, in a papyrus swamp in western Uganda. Monthly records of the distribution and relative abundance of C. liocephalus across 28 swamp stations were used to examine seasonal trends in habitat use and movement. My results suggest that dissolved oxygen did not directly limit use of, or dispersal through, the papyrus swamp. C. liocephalus were found at most stations in the dry season, and there was no significant relationship between the number of stations used per month and mean monthly dissolved oxygen levels. In addition, there was no evidence for a significant effect of oxygen on the relative abundance of fish among stations during the driest months, or during peak flood conditions. However, relative abundance was positively correlated with water depth during the dry season. Fish from deeper habitats exhibited fewer injuries and lower rates of disappearance than fish from shallower waters. This may reflect the risk of aerial predation for surfacing fish. A comparison of habitat use and movements of C. liocephalus with the only other fish species found in the papyrus swamp, Barbus neumayeri, supports the idea that respiratory mode can affect the use of hypoxic papyrus swamps. B. neumayeri, is a small water-breathing cyprinid that uses aquatic surface respiration in response to severe hypoxia. The air-breathing capabilities of C. liocephalus permitted more widespread use of swamp waters than B. neumayeri. This study demonstrates that an understanding of the respiratory mode of fish species may be useful in predicting patterns of habitat use.     

黄河口渔业资源底拖网调查采样断面数对资源量指数估计的影响

为查明采样强度对多种类渔业调查中资源量指数估计的影响,实验根据2013年8月、10月和2014年2月、5月黄河口渔业资源底拖网调查数据,选取短吻红舌鳎、方氏云鳚、矛尾虾虎鱼、枪乌贼、口虾蛄、日本蟳和小型鳀鲱鱼类为调查目标,利用计算机模拟方法,以相对估计误差(REE)、相对偏差(RB)、变异系数(CV)和准确度变化率(ACR)等为评价指标,研究了调查样本量对不同种类资源量指数估计的影响。结果显示,各种类资源量指数估计的REE、CV和ACR随断面数增加均逐渐降低并趋于稳定;除在断面数3减到1时,日本蟳、口虾蛄和方氏云鳚等个别种类RB绝对值增大外,其他RB不存在一致性的增大或减小趋势。研究表明,由于不同种类的分布存在时空差异,不同种类需要的调查断面数不同;当目标种类数量空间分布变异较小时,减少调查断面数对采样精确度影响较小,反之则需要更多调查断面数。对于多种类渔业资源调查,需要综合权衡各目标种类来确定最适调查断面数。     

黄河口水域主要鱼种的时空生态位宽度和重叠

生态位在研究群落结构、种间关系和生物多样性等方面具有重要作用。为深入了解黄河口水域鱼类群落结构和种间关系,本研究根据2013—2014年在黄河口水域进行的7个航次的渔业资源底拖网调查数据,应用平均拥挤度、生态位宽度和生态位重叠值等指数研究了该水域12种鱼类的时空生态位宽度和重叠特征。结果表明,黄河口水域主要鱼种时间生态位宽度变化范围为0～1.53,其中矛尾虾虎鱼(Chaemrichthys stigmatias)和方氏云鳚(Enedrias fangi)时间生态位宽度值较高,安氏新银鱼(Neosalanx anderssoni)和鮻(Liza haematocheila)较低。主要鱼种空间生态位宽度具有明显季节变化。所有鱼种间的平均空间生态位重叠值也有着明显的季节差异。生态位宽度和重叠值与各鱼种数量、分布、生态习性和生境状况密切相关,反映了该海域不同鱼种对生境资源的不同利用能力。     

Colonisation tactics of three temperate catadromous species,eel Anguilla anguilla,mullet Liza ramada and flounder Plathychtys flesus,revealed by Bayesian multielemental otolith microchemistry approach

Daverat F, Martin J, Fablet R, Pécheyran C. Colonisation tactics of three temperate catadromous species, eel Anguilla anguilla, mullet Liza ramada and flounder Plathychtys flesus, revealed by Bayesian multielemental otolith microchemistry approach.
Ecology of Freshwater Fish 2011: 20: 42–51. © 2010 John Wiley & Sons A/S Abstract – The colonisation of Gironde (SW France) river catchment by juvenile, eel, Anguilla anguilla, flounder Platychtys flesus and thinlipp mullet Liza ramada was investigated comparatively using Sr:Ca and Ba:Ca composition of otolith. The relation between Sr, Ba and habitat was investigated based on Sr and Ba water composition sampled each month along the estuary‐river gradient. A total of 50 mullets, 30 eels and 47 flounders were collected in the Gironde river catchment. Analysis was performed with a Femtosecond LA‐ICPMS along a trajectory from the core to the edge. Sr and Ba water concentrations discriminated three habitats within the Gironde system, the lower estuary, the upper estuary and the freshwater sites. A signal processing method based on Gaussian hidden Markov models was applied to the multielemental life‐history data. The linear model used to allocate a Gironde habitat to coupled Sr, Ca values was parameterised with seasonal patterns and magnitude of Sr and Ba water values in the different habitats. The results showed that the three species used three different habitats and they had a large diversity of habitat use patterns with resident and nomadic tactics. Resident tactics were less frequent than nomadic tactics that suggested individual fish used two or more habitats. Mullet used a wider range of habitats in the lower part of the estuary than eel and flounder and switched habitats more frequently. Flounders tended to colonise initially freshwater, and then estuarine habitats later in life while mullets used the entire range of available catchment habitats throughout their life.     

Replacement of corn with mangrove seeds in bluespot mullet Valamugil seheli diets

Four approximately isoenergetic isonitrogenous diets containing 0, 150, 300 and 510 g kg^?1 mangrove seeds as a replacement for dietary corn in bluespot mullet Valamugil seheli (Valenciennes) commercial feed were fed to triplicate groups (100 fish each) of fingerlings (0.5 g) for 10 weeks. The closed re‐circulating system consisted of 12 cubical tanks (2.25 m³ each). Fish were fed three times a day to satiation. Growth ranked the diets 300 > 150 > 0 > 510 g kg^?1 mangrove seed substitution and in most cases differences in fish weight or SGR were significant (P < 0.05). Proximate composition of fish bodies was affected (P < 0.05) by replacing dietary corn with mangrove seeds in test diets. As the level of mangrove seed incorporation increased, fish body moisture, ash, and protein increased and body fat reduced. Inclusion of mangrove seed up to 300 g kg^?1 as a replacement for corn caused gradual improvement in fish growth performance. Further increase in mangrove seed inclusion (510 g kg^?1) had a negative effect on fish growth performance.     

围网养殖对华阳河湖鱼类群落结构的影响

为了发展渔业生产,人们将大量自然湖泊通过围网的方式投放鱼苗进行养殖。目前,这种养殖模式对鱼类群落的影响没有得到有效的评估。本研究于2016年在华阳河湖围网养殖区和非养殖区分别设置采样点对鱼类进行季度调查,探讨围网养殖对鱼类群落结构的影响。结果显示,在围网养殖区共采集鱼类6目12科35属46种,非养殖区采集鱼类6目11科40属57种,其中以鲤形目种类最多,分别占养殖区和非养殖区鱼类总数的65.22%和63.16%。非养殖区的优势种为?和短颌鲚,而鲢、鳙是围网养殖区的优势种。与非养殖区相比,围网养殖区山溪河流性鱼类百分比从21.05%降低至15.22%。通过双因素方差分析解析养殖与季节对鱼类群落结构的影响,发现围网养殖区的鱼类密度、物种数、优势度指数都显著低于非养殖区,而均匀度指数显著高于非养殖区。通过SIMPER分析得出,造成养殖区和非养殖群落结构差异的重要贡献物种为短颌鲚、?、鲤、太湖短吻银鱼、鲫、鱵、鲢和鳙。