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1.
A unique lipoprotein profile was found in the plasma of cultured Japanese eel,Anguilla japonica which accumulated more lipid in its muscle than in its liver. The plasma lipoprotein level of Japanese eels was in excess of 54 mg ml1, a concentration considered to be hyperlipoproteinemic in relation to other teleosts. The plasma lipoproteins consisted of very low density lipoprotein (VLDL, density (d)<1.006 g ml1) low density lipoprotein (LDL, 1.0061), high density lipoprotein 2 (HDL2, 1.0851), and HDL3 (1.1001). VLDL, but not HDL, was the main component in the plasma of Japanese eels, unlike most teleosts where HDL is the main component. An additional lipoprotein, vitellogenin (1.2101), was induced by the injection of estradiol-17ß (E2), but VLDL was the main plasma component even in the E2-treated eels. VLDL was a triacylglycerol (TG)-rich lipoprotein and possessed two apolipoprotein (apo) B-like proteins of molecular weights (Mr) 260K and 230K as main components.LDL, HDL2, and HDL3 were revealed to consist of heterogeneous components by a density gradient ultracentrifugation. LDL was separated into three subclasses of LDL1 (1.0301), LDL2 (1.0431), and LDL3 (1.0671). LDL1 with apo B-like protein of Mr 230K was a TG-rich lipoprotein, while both LDL2 and LDL3 were cholesterol ester-rich lipoproteins with apo A-I-and A-II-like proteins of Mr 25K and 14K. The particle sizes of HDL2 and HDL3 subclasses differed, although all of HDL2 and HDL3 subclasses possessed apo A-I-and A-II-like proteins of Mr 25K and 14K as main components. To our knowledge, this is the first report of detailed plasma lipoprotein profile in Japanese eels.Corresponding author: till August 18, 1996 and after April 19, 1997: at the above address. From August 19, 1996 till April 18. 1997: c/o Dr. N.H. Haunerland, Department of Biological Sciences. Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6.  相似文献   

2.
Russon IJ, Kemp PS, Calles O. Response of downstream migrating adult European eels (Anguilla anguilla) to bar racks under experimental conditions.
Ecology of Freshwater Fish 2010: 19: 197–205. © 2010 John Wiley & Sons A/S Abstract – The behavioural response of downstream migrating nonsalmonid fish to hydraulic conditions associated with river infrastructure is poorly understood. The response of downstream migrating adult European eels (Anguilla anguilla) to bar racks (12 mm bar spacing) angled on the vertical and horizontal planes under different flow regimes and during periods of darkness was assessed. Eels predominantly moved along the channel floor and wall, tending to follow routes where turbulence intensity was high. Time taken to approach the racks was greater than expected if fish had moved passively with the flow. Eels did not exhibit clear avoidance behaviour prior to encountering the racks, instead marked changes in behaviour occurred only after physical contact was made with the structure. No impingement or passage through the racks occurred, and passes per approach were high (98.3%), when vertical racks were angled 15°, 30° or 45° relative to the flow. Impingement and passage through the racks only occurred when horizontally inclined racks were placed perpendicular to the flow. The time eels were impinged on the racks was negatively related to discharge when angled at 30° relative to the channel floor, and positively related when upright. Frequency of impingement was higher under low discharge (132.9 ± 16.6 l·s?1). Impinged eels escaped from racks at approach velocities of 0.90 ± 0.05 m·s?1. Passage through the upright rack was common under high discharge (278.9 ± 36.2 l·s?1). The information presented will improve current fish passage criteria for European eels that are required to develop more effective fish passage facilities.  相似文献   

3.
Microbiological analyses were conducted on wild eels from the L′Albufera Lake (Spain). A total of 174 individuals were collected in two surveys (i.e. year 2008 and autumn–winter 2014) among those caught by local fishermen into the lagoon. The prevalence of Shewanella putrefaciens group was 1.7% in 2008 and rose above 32% in 2014. It was due to an outbreak of shewanellosis that presented a morbidity rate of 64%. S. putrefaciens group strains were isolated as pure cultures from the sick eels that showed white ulcers surrounded by a reddish inflammation, damage of the mouth, extensive skin discoloration, exophthalmia, ascites and bad odour. The S. putrefaciens group was recovered from freshwater samples taken at the L′Albufera system, along autumn–winter 2015. Its counts significantly increased in freshwater parallel to hypoxia and temperature rising. Shewanellae strains were identified as S. putrefaciens and S. xiamenensis by 16S rRNA gene sequencing. These isolates recovered from sick eels or freshwater were virulent for European eel by IP challenge (LD50 106 CFU g?1 body weight). They also caused 30–38% cumulative mortality, in European eels challenged by a 2‐h bath (107 CFU mL?1). These results suggest that shewanellosis could be transmitted through water highlighting the fact that hypoxic conditions increase this bacterium levels in water.  相似文献   

4.
The Antarctic notothenioid, Pagothenia bernacchii, were found to have plasma total and free calcium levels, plasma inorganic phosphate and whole body calcium efflux rates which were similar to those seen in other teleosts. But total bone calcium was lower than reported for other teleosts. A single injection of vitamin D3 (5 ng g–1 fish) increased plasma total and plasma free calcium and these increases were associated with an increase in whole body calcium efflux and bone calcification. Conversely, the same treatment with 1,25-(OH)2-D3 reduced plasma free calcium. This seco-steroid also increased the specific activity of 45Ca in bone at 40h post-injection but did not significantly effect total bone calcium, plasma total calcium or whole body calcium efflux. 25-OH-D3 at the same dose had no effect on any of the parameters tested and none of the seco-steroids tested had any effect on plasma total inorganic phosphate. These data show that both D3 and 1,25-(OH)3-D3 can have calcitropic effects in this marine teleost and that these two forms of vitamin D can exert different effects within the same species.  相似文献   

5.
The effect of various dietary starch to proteins ratios (STA/P) on growth performance, oxidative status and liver enzyme activities involved in intermediary metabolism in juvenile Nile tilapia was evaluated. Four isocaloric‐practical diets (12.73 MJ kg?1 digestible energy) with increasing STA/CP ratios were formulated. These were designated D0 (344 g crude protein (CP) and 163.5 g starch (STA) kg?1), D1 (310 g CP and 243 g STA kg?1), D2 (258 g CP and 322 g STA kg?1) and D3 (214 g CP and 401 g STA kg?1). Each diet was fed to triplicate groups of 60 fish (2.7 g) for 45 days. Compared with the control diet (D0), significantly (P < 0.05) depressed growth and feed efficiency were observed only in the groups fed on diet D3. The activities of hepatic enzymes involved in glycolysis and lipogenesis pathways were significantly enhanced in groups fed on diet D3 compared with other diets. A significant (P < 0.05) increase in catalase activity was detected only in groups fed on diet D3. Similarly, a significant (P < 0.05) enhancement in superoxyde dismutase, glutathione S‐transferases and glutathione peroxidise was observed in groups fed on diets D2 and D3 compared with other diets. Results demonstrate the ability of juvenile Nile tilapia to spare protein by dietary carbohydrate.  相似文献   

6.
Abstract – Yellow‐phase Japanese eels (Anguilla japonica) were investigated in the Hamana Lake system, Japan, from 2003 to 2004 to understand how their demographic attributes vary within the lake system. A total of 779 yellow eels were collected during sampling in two inlet rivers and two brackish/saltwater lakes within the lake system. Female eels predominated, constituting 84% of the 75 sex‐determined eels in the river, and 50% of the 151 sex‐determined eels in the lakes. Total lengths (TL) of all eels examined ranged from 54.2 to 715.0 mm (mean = 320.4 ± 145.4 SD). In the inlet river, the TL of eels showed a significant positive relation with the distance from the river mouth. The estimated relative abundances of eels ranged from 0 to 1.8 eels·m?2 effort (mean: 0.3 ± 0.41) in the river and was negatively correlated with the distance from the river mouth. This suggested that larger eels might tend to be distributed at lower abundances in upstream reaches of the river. Mean age of yellow eels determined by their otolith annuli was younger in the lake (N = 117, 3.3 ± 1.4 years) than in the river (N = 214, 4.3 ± 1.7 years). Growth rate was higher in the lake than in the river at age 1–2 years (131.9 and 104.4 mm·year?1, respectively). The results of this study suggest that, although Japanese eels can adapt to various types of environments, significant differences can occur in population structures and growth patterns among habitats.  相似文献   

7.
Abstract – Downstream migration of female silver eel Anguilla anguilla (L.) was studied by remote telemetry in the lower part of the River Meuse (Belgium and the Netherlands) using a combination of nine detection stations and manual tracking. N = 31 eels (LT 64–90 cm) were implanted with active transponders and released in 2007 into the River Berwijn, a small Belgian tributary of the River Meuse, 326 km from the North Sea. From August 2007 till April 2008, 13 eels (42%) started their downstream migration and were detected at two or more stations. Mean migration speed was 0.62 m·s?1 (or 53 km·day?1). Only two eels (15%) arrived at the North Sea, the others being held up or killed at hydroelectric power stations, caught by fishermen or by predators or stopped their migration and settled in the river delta. A majority (58%) of the eels classified as potential migrants did not start their migration and settled in the River Berwijn or upper Meuse as verified by additional manual tracking.  相似文献   

8.
European eels (Anguilla anguilla, L.) were fed on a commercial diet supplemented either with 15% by dry feed weight of menhaden oil (MO), an oil rich in highly unsaturated fatty acids of the n-3 series (n-3 HUFA), or with 15% by dry feed weight of coconut oil (CO), an oil composed primarily of saturated fatty acids (SFA). Following 90 days of feeding, the mean final masses of eels fed the two different oil supplements were similar, and higher than the mean final mass of a group fed the commercial diet alone. The diets created two distinct phenotypes of eels, distinguished by the fatty acid (FA) composition of their tissue lipids. Eels fed MO had significantly more total n-3 FA and n-3 HUFA in muscle and liver lipids than did eels fed CO, leading to higher n-3/n-6 and eicosapentaenoic acid/arachidonic acid ratios in the MO group. Measurements of O2 uptake (MO2) revealed that the MO group had a significantly lower routine metabolic rate (RMR) than the CO group. When exposed to progressive hypoxia, both groups regulated MO2 at routine normoxic levels until critical water O2 partial pressures that were statistically similar (9.62±1.08 kPa in MO versus 7.57±1.07 kPa in CO), beyond which they showed a reduction in MO2 below RMR. The MO group exhibited a significantly lower MO2 than the CO group throughout hypoxic exposure, but the percentage reductions in MO2 below their relative RMR were equal in both groups. During recovery to normoxia, both groups exhibited an increase in MO2 to rates significantly higher than their RMR. Throughout recovery, MO2 was significantly lower in the MO group compared with the CO group, but the percentage increases in MO2 relative to RMR were equal in both. During progressive hypoxia, neither group exhibited a marked ventilatory reflex response, both showed similar reductions in blood O2 partial pressure and content, and similar increases in plasma lactate. The results indicate that, although the n-3 HUFA-enriched MO group had a significantly lower routine metabolic rate than the CO group, the difference in aerobic metabolism did not influence the European eel's homeostatic regulation of MO2 in hypoxia.  相似文献   

9.
Marbled eels, Anguilla marmorata (Quoy & Gaimard), cultured in Taiwan exhibited haemorrhage and mortality in January 2012. The severely diseased eels bled from the gills and showed congestion of the central venous sinus of the gill filaments and haemorrhage throughout the body similar to viral endothelial cell necrosis of eel. In this study, a novel polyomavirus (AmPyV) was isolated from the diseased eels using the AMPF cell line established from the pectoral fin of healthy marbled eels. AmPyV was found to encode a long T‐antigen orthologous gene. Phylogenetic analysis showed that AmPyV was closely related to Japanese eel endothelial cell‐infecting virus. PCR assays revealed AmPyV infection throughout the systemic organs. AmPyV proliferated in the AMPF, EK‐1 and EO‐2 cells at temperatures 25–30 °C, and the progeny virus yields were 107.0, 107.4 and 107.7 TCID50 mL?1, respectively. The purified virions were icosahedral particles, 70–80 nm in diameter. No clinical signs or mortality was observed among the eels injected with the virus; however, the virus was reisolated from the brain, eyes, kidneys, fins and gills of infected eels 2 month after injection. Our results suggest that AmPyV exhibits a latent infection. Pathogen of the disease needs to study further.  相似文献   

10.
Cultured barramundi, Lates calcarifer, suffer from abnormalities affecting the jaw, opercula and spine. The aim of this study was to quantify for the first time the effects of supplemented dietary vitamin C, vitamin D3 and ultraviolet (UV) light on the development of jaw, opercula and spinal deformities. Four diets were formulated to contain (i) no vitamin C or vitamin D3, (ii) only vitamin D3, (iii) only vitamin C and (iv) both vitamin C and vitamin D3. In addition, two commercial diets (diets 5 and 6) were also tested. These diets were replicated in the presence, and in the absence, of ultraviolet (UV) light as this may also affect skeletal development. Diets formulated with 170 ± 1 mg kg?1 and 195 ± 0.5 mg kg?1 of vitamin C (diets 3 and 4, respectively) and the commercial diets (diets 5 and 6) had significantly lower incidences of spinal deformities (0–2.5%; P < 0.01) and opercula deformities (nil detected). Spinal deformities were ‘broken back’ syndrome, which was found only in the precaudal vertebrae, and lordosis which was only in the caudal vertebrae. UV light and vitamin D3 did not affect spinal or opercula deformities. There was no change in the occurrence of jaw deformities in vitamin C, vitamin D3 or UV light treatments.  相似文献   

11.
Gastrointestinal and metabolic influences on short- and medium-term control of voluntary feed intake of European eel were investigated for groups of fish fed at different feeding schedules: 1 meal 2 days−1, 1 meal day−1, 2 meals day−1 and continuous feeding for 12 h and 24 h daily. For fish fed daily, the feeding schedule had no effect on feed intake, metabolism, growth, size variation and body composition. Only fish fed once every 2 days could not completely compensate by increasing their average meal size and showed a reduced feed intake, metabolism and growth. Stomach capacity did not limit meal size and feed intake as large differences in appetite were found for eels with empty stomachs. Feed intake was related to metabolism as the levels of O2 consumption and NH4 excretion just before the meal were correlated to average meal size, suggesting that rate (and duration) of metabolism is sensed and is providing information about the metabolic consequences of feed intake and feed processing. Meal size is based on the (expected) scope for metabolism and eels seem to strive to an average daily feed intake, associated with their developmental state (growth potential). Plasticity in this feed intake behaviour, expressed by individual variation in feed intake and day-to-day fluctuations in individual and group intake, is regarded as adaptive on different time scales.  相似文献   

12.
The specific and non‐specific immune parameters and protection of European eels (Anguilla anguilla) were evaluated after bathing eels with Aeromonas hydrophila. Two hundred eels were distributed into two equal groups and bathed with Phosphate‐buffered saline (Control group) or 1.0 × 107 cfu mL?1 A. hydrophila (Test group) for 1 h respectively. Then, eels were bled aseptically from the caudal sinus on 1, 4, 7, 14 and 28 days post treatment. The blood cells were used to evaluate the cellular immunity and the serum was used to determine the titres of specific antibody as well as the activities of superoxide dismutase (SOD) and lysozyme. Eels from both groups were challenged by intraperitoneal injection of 1.0 × 107 cfu of A. hydrophila on 28 and 42 days post bathing. The results show that eels bathed in A. hydrophila significantly (P < 0.05) enhanced the proliferation of different types of blood cells and the serum titres of anti‐A. hydrophila antibody. The Relative Percent Survival (RPS) after challenge on 28 and 42 days post bathing in Test group vs. Control group was 40% and 50% respectively. These results suggest that bathing European eels in A. hydrophila would positively affect specific as well as non‐specific immune parameters and protect against A. hydrophila infection in freshwater farming.  相似文献   

13.
To learn about the relationships between feeding and growth of temperate eels in freshwater and brackish water habitats, we analysed 533 yellow‐phase Japanese eels Anguilla japonica collected in both types of habitats in southeastern Japan. Because male eels were very rare in each habitat (FW, N = 1; BW, N = 20), characteristics of female eels were compared between the different habitats. Annual food consumption was evaluated with the consideration of instantaneous food consumption and annual activity period. Stomach fullness index (stomach content weight/body weight) was used as an indicator of instantaneous food consumption. The ratios of number of months with eel catch to those when eel sampling was conducted were used as an indicator of activity period. Female yellow eels tended to be older and slower growing in fresh water (N = 78; age, mean ± SD = 7.9 ± 2.4 years; growth rate, 59.8 ± 14.0 mm year?1) than in brackish water (N = 229; age, 5.5 ± 1.8 years; growth rate, 90.1 ± 24.4 mm year?1). Irrespective of sex, yellow eels in brackish water had a higher stomach fullness index and a greater ratio of months with eel catches, indicating greater annual food consumption by brackish water eels. These results indicate that greater annual food consumption contributes to the greater growth rates of Japanese eels in brackish water habitats.  相似文献   

14.
为确定海南某鳗鲡养殖场患病美洲鳗鲡大量死亡的原因,从患病美洲鳗鲡肝脏和脾脏中分离获得1株优势菌株AB01,回归感染证实该菌株为导致此次美洲鳗鲡患病的病原菌。经生理生化鉴定、16S rDNA基因序列比对及系统发育分析,判定菌株AB01为鲍曼不动杆菌。致病性分析结果显示,菌株AB01对美洲鳗鲡的半致死浓度为4.63×106CFU/mL。组织病理学观察显示,患病美洲鳗鲡的肝脏、脾脏均发生不同程度的病变,其中,肝脏中部分肝索排列紊乱,细胞肿胀,胞核溶解,胞质疏松,结构模糊,有大量大小不等的空泡;脾脏中胞质多处稀疏,伴有大面积损伤。药敏检测显示,鲍曼不动杆菌AB01对头孢噻吩、头孢唑啉、阿奇霉素、丁胺卡那霉素、利福平、依诺沙星、环丙沙星、氧氟沙星敏感,对氟苯尼考、氨苄西林等9种抗生素中度敏感,对氨曲南和四环素等20种抗生素有多重耐药性。  相似文献   

15.
A 63‐day feeding study was conducted to evaluate the effect of partial substitution (0%, 20%, 40% and 60%) of dietary fish meal (FM) with soybean meal (SBM) on the growth performance and feed utilization of speckled shrimp, Metapenaeus monoceros juveniles. A total of 180 M. monoceros juveniles with an average weight of 0.67 ± 0.18 g were equally distributed over 12 glass aquaria (30 L each, triplicate per treatment). All aquaria were filled with filtered sea water (30–35 ‰, salinity). Four isonitrogenous (400 g kg?1 crude protein) and isocaloric (20.5 MJ GE kg?1) test diets were formulated. The control diet contained FM (D1) as the main protein source. In the other diets, FM was partially replaced with 20 (D2), 40% (D3) or 60% (D4) SBM. The results indicate that the diet in which 40% of the FM is replaced by SBM yields similar growth and production, and is as cost effective, as the control diet.  相似文献   

16.
A total of 180 Labeo rohita fry (≈1 g) were distributed into six treatment groups with three replicates each. Six isoenergetic (15.8 kJ g?1) diets were prepared with varying levels of protein (CP) and gelatinized carbohydrate (GC), viz. D1: 450 g kg?1 CP, 258 g kg?1 GC; D2: 400 g kg?1 CP, 302 g kg?1 GC; D3: 350 g kg?1 CP, 399 g kg?1 GC; D4: 301 g kg?1 CP, 447 g kg?1 GC; D5: 249 g kg?1 CP, 517 g kg?1 GC and control diet, D6: 400 g kg?1 CP, 468 g kg?1 GC and these were fed to fish at 40 g kg?1 wet body weight per day for 60 days. Highest growth was recorded for fish fed D4, decreasing for D5. Protein utilization, amylase activity and carbohydrate digestibility were significantly positively correlated with GC (P < 0.05) and were highest in fish fed D5. Hypertrophy of hepatic cells was only recorded for D5. Lysine, which may be affected during gelatinization, was estimated in diets and found to be above the minimum level required. Survival rate was unaffected by diet. The results of the present study indicate that a diet containing 450 g kg?1 GC and 300 g kg?1 CP was efficiently utilized by L. rohita fry.  相似文献   

17.
There is expanding interest in the culture of the Australian shortfin eel Anguilla australis Richardson; however, there is a lack of fundamental biology and husbandry information necessary to further develop an industry within Australia. The present study was undertaken to gain a preliminary understanding of basic husbandry requirements for rearing of juvenile A. australis (glass eels and elvers) in tanks and earthen ponds. Newly caught glass eels were successfully acclimated to culture conditions. During tank culture trials, specific growth rates (SGR) and survival rates ranged from ?2.1 to 2.8% day?1 and 52% to 100% respectively. Glass eels weaned onto a commercial eel diet exhibited a significantly greater SGR and survival rate than those weaned onto a commercial trout diet. Glass eels weaned onto an eel diet over a 15‐day period grew slightly faster than eels weaned over a 5‐day period, but survival rates were not significantly different for each treatment. SGRs (up to 2.8% day?1) were significantly higher for glass eels fed at 9 and 12% day?1 than at 6% day?1. Stocking densities between 2.5 kg m?3 and 30 kg m?3 did not influence either SGR or survival rates. SGRs were significantly higher for glass eels cultured at 25 °C than at lower temperatures. During pond culture trials, SGRs and survival rates ranged from 1.36 to 1.65% day?1 and 39% to 77% respectively. The SGR and survival rates of juvenile eels stocked into ponds receiving supplementary feeding with a commercial eel diet were not significantly different to those of eels stocked into ponds that did not receive supplementary feeding.  相似文献   

18.
为研究Akt基因在中华绒螯蟹蜕壳前后肌肉生长过程中的功能,应用RACE技术克隆得到编码中华绒螯蟹Akt(命名为Es Akt)的全长为2 200 bp的c DNA序列,包括159 bp的5′非翻译区(5′-UTR)、496 bp的3′非翻译区(3′-UTR)和长度为1545 bp编码514个氨基酸的编码序列。蛋白质结构域分析显示Es Akt含有丝氨酸/苏氨酸蛋白激酶家族的3个特征性保守结构域。多序列比对和系统发育分析显示,Es Akt与中国明对虾、凡纳滨对虾的Akt序列一致性都为0.889,在系统发育树中节肢动物Akt形成一个分支。应用荧光定量RTPCR技术分析Es Akt在性成熟中华绒螯蟹各组织及幼体不同蜕壳时期不同部位肌肉组织中转录水平上表达量的变化。结果显示,Es Akt在性成熟个体的肝胰腺、眼柄、表皮、卵巢、精巢、心脏、螯足、鳃、三角膜等组织中均有表达,其中卵巢、眼柄和精巢中表达量较高,肝胰腺中表达量最低。在幼体不同蜕壳时期不同部位的肌肉中,Es Akt表达量变化不同,步行足肌肉组织中Es Akt m RNA无显著的统计学差异。腹部肌肉组织中Es Akt m RNA水平在蜕壳前晚期D3~D4期表达量显著高于蜕壳后A~B期和蜕皮间期C期。螯足肌肉在蜕壳前晚期D3~D4期急剧下调,蜕壳后A~B期开始表达量显著升高,直至蜕皮间期C期。研究表明,Es Akt在中华绒螯蟹蜕壳过程中不同部位肌肉组织中的表达量变化与蜕壳周期密切相关,说明Es Akt参与中华绒螯蟹蜕壳诱导的肌肉萎缩、生长及重建过程。  相似文献   

19.
Glucose, when measured in haemolymph, has been found to reflect a useful predictor of energetic investment. This study evaluated the pattern of glucose in the haemolymph, with an attempt to gain a better insight into the role of glucose as nutritional source of ovarian development and energy reserves during reproductive and non‐reproductive moulting cycles. The haemolymph of female giant freshwater prawn, Macrobrachium rosenbergii, was obtained at eight different moulting stages, and levels of glucose were determined using an enzymatic colorimetric glucose‐oxidase method in parallel with a histological examination of ovarian development. Glucose levels were relatively low (0.15 ± 0.02 mg mL?1) at D0 stage, an abrupt increase (0.52 ± 0.13 mg mL?1) during premoult D1 stage and declined (0.32 ± 0.10 and 0.31 ± 0.09 mg mL?1) during premoult D2 and D3 stages, respectively; thereafter, a slight increase (0.43 ± 0.09 mg mL?1) occurred at post‐moult A stage. The progression of ovarian growth, marked by an increasing gonadosomatic index (GSI) pattern during the reproductive moulting cycle (C0–D3 stages), was directly proportionate to fluctuations in glucose levels. GSI was significantly positively correlated with glucose (R = 0.40; P < 0.05). In contrast, glucose was notably higher at post‐moult A and premoult D2 stages during non‐reproductive moulting cycle, the period during which glucose is crucial for exoskeletal chitin synthesis. At this particular stage, a negative correlation between body weight and glucose (R = ?0.36; P < 0.05) was observed. The dynamics of glucose in the haemolymph of female M. rosenbergii correlated with ovarian growth, which signify that glucose as nutritional source for vitellogenesis, and affects the body weight of this species.  相似文献   

20.
莱州湾鱼类群落的关键种   总被引：6，自引：2，他引：4  
杨涛  单秀娟  金显仕  陈云龙  吴强  刘文辉 《水产学报》2016,40(10):1613-1623
关键种对群落结构稳定性起着决定作用,它的筛选对于整个生态系统的研究都具有重要的理论和实际意义。本研究基于2011年5月对莱州湾渔业底拖网数据,以摄食关系为基础构建了莱州湾鱼类群落种间相互作用关系网,运用网络分析法计算了该关系网的13种重要性指数及Key Player Problem参数(F、DF和DR)。根据13种指数的排序结果、聚类信息和3个Key Player Problem参数,对莱州湾鱼类群落的关键种进行了筛选。结果显示,13种重要性指数可划分为4个信息组:a(D、CC、IC、TI~1和TI~7)即基本信息组、b(D_(in)、H_(in)和K_t)即信息输入组、c(D_(out)、H_(out)和K_b)即信息输出组和d(BC和K)即信息控制组。细纹狮子鱼(D、D_(in)、BC、CC、IC、H_(in)、TI~1、TI~7、K、K_t、F、~DF和~DR)和六丝矛尾虾虎鱼(D_(out)、H_(out)和K_b)在莱州湾鱼类群落的网络分析结果中处于最高地位,密切联系着群落的其他种群,控制着群落的结构和能流,属于群落的关键种,其中细纹狮子鱼是关键捕食者,控制着群落中其他重要食物竞争者和捕食者密度,六丝矛尾虾虎鱼是关键被捕食者,通过维持捕食者的密度来限制其他被捕食者的密度。  相似文献   

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