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1.
Although chub mackerel (Scomberjaponicus) is a primary pelagic fish species,we have only limited knowledge on itskey life history processes.The present work studied the age and growth of chub mackerel in the East China and Yellow Seas.Agewas determined by interpreting and counting growth rings on the sagitta otoliths of 252 adult fish caught by the Chinese commercialpurse seine fleet during the period from November 2006 to January 2007 and 150 juveniles from bottom trawl surveys on the spawn-ing ground in May 2006.The difference between the assumed birth date of 1 st April and date of capture was used to adjust the agedetermined from counting the number of complete translucent rings.The parameters of three commonly used growth models,the vonBertalanffy,Logistic and Gompertz models,were estimated using the maximum likelihood method.Based on the Akaike InformationCriterion (AIC),the von Bertalanffy growth model was found to be the most appropriate model.The size-at-age and size-at-maturityvalues were also found to decrease greatly compared with the results achieved in the 1950s,which was caused by heavy exploitationover the last few decades. 相似文献
2.
Abstact Age and growth characteristics of crimson sea bream Paragyrops edita Tanaka in Beibu Gulf were studied through bottom trawling and gillnet fleets fishing from July 2006 to December 2007. A total
number of 1155 individuals, ranging from 49 to 249 mm in standard length was examined. The age of the fish was determined
from sagittal otoliths. One year growth was made up of one translucent and one opaque zone. A maximum likelihood estimation
procedure was used to fit the Von Bertalanffy, Logistic and Gompertz growth functions to the length-at-age data. ARSS indicated
that there were no significant differences in growth between sexes in the three growth models (P>0.05), and the Von Bertalanffy growth function L
t
=292.8{1−exp [−0.167(t+1.116)]} was selected as the most appropriate growth model according to Akaike’s information criterion (AIC). 相似文献
3.
Age and growth characteristics of crimson sea bream Paragyrops edita Tanaka in Beibu Gulf were studied through bot-tom trawling and gillnet fleets fishing from July 2006 to December 2007.A total number of 1155 individuals,ranging from 49 to 249mmin standard length was examined.The age of the fish was determined from sagittal otoliths.One year growth was made up of onetranslucent and one opaque zone.A maximum likelihood estimation procedure was used to fit the Von Bertalanffy,Logistic andGompertz growth functions to the length-at-age data.ARSS indicated that there were no significant differences in growth betweensexes in the three growth models (P>0.05),and the Von Bertalanffy growth function L<,t>=292.8{1-exp[-0.167(t 1.116)]} was se-lected as the most appropriate growth model according to Akaike's information criterion (AIC). 相似文献
4.
We collected Vimba vimba throughout the spawning season (mid April to mid June, 2007) in Gorgan Bay (south-western Iran) and investigated its age,
growth, and reproductive traits. The maximum age was 5+ years. Both sexes grew allometrically (positive for males: b=3.140 9 and negative for females: b=2.791 4). The von Bertalanffy growth functions were described by the formulae L
t
=32.565(1-e−0.184(t+0.530)) for males and L
t
=35.950(1-e−0.179(t+0.529)) for females. The overall sex ratio was balanced, but males were predominant in the smaller size classes and females in the
larger size classes. Based on the gonadosomatic index (GSI) values, spawning appears to occur between late April and late
May in the bay. The highest mean GSI was 6.44 for males in early May and 20.36 for females in late April. Absolute fecundity
varies from the minimum of 5 436 eggs for age 3+ fish to the maximum of 36 141 eggs for age 5+ fish. Fecundity was also positively correlated with fish size (length and weight). Egg diameter ranged from 1.05 to 1.70
mm in the mean of 1.42 mm. There was no correlation between female size and ova diameter. 相似文献
5.
As fish is one source of the ‘big eight’ food allergens,the prevalence of fish allergy has increased over the past few years.In order to better understand fish allergy,it is necessary to identify fish allergens.Based on the sera from fish-allergenic patients,a 28 kDa protein from local mackerel (Scomber japonicus),which has not been reported as a fish allergen,was found to be reactive with most of the patients’ sera.The 28 kDa protein was analyzed by MALDI-TOF-MS (Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry).Mascot search in NCBI database (Date: 08/07/2010) showed that the top protein matched,i.e.triosephosphate isomerase (TPI) from Xiphophorus maculatus and Poecilia reticulata,had a mowse (molecular weight search) score of 98.In addition,TPI from Epinephelus coioides also matched this mackerel protein with a mowse score of 96.Because TPI is con-sidered as an allergen in other non-fish organisms,such as lychee,wheat,latex,archaeopotamobius (Archaeopotamobius sibiriensis) and crangon (Crangon crangon),we consider that it may also be an allergen in mackerel. 相似文献
6.
北部湾二长棘鲷生长、死亡及其群体组成 总被引：6，自引：1，他引：5
利用2006年7月至2008年3月北部湾渔业商业捕捞底拖网和刺网渔获物中采集的样本,对北部湾二长棘鲷的生长、死亡及其群体组成进行了初步研究。结果表明,北部湾二长棘鲷优势体长70～140 mm,占82.2%;优势体重为20～60 g,占54.29%;ARSS分析表明雌雄生长不存在显著性差异(P>0.05),繁殖期性比为1.21∶1;von Bertalanffy生长方程的主要参数分别为:L∞=292.8 mm,K=0.167,t0=-1.116;体重的生长拐点为5.463龄;总死亡系数、自然死亡系数和捕捞死亡系数分别为1.041 4、0.282 8和0.752 6,当前开发率为0.728。 相似文献
7.
The relationship between the spatiotemporal distribution of three dominant small pelagic fishes,including chub mackerel(Scomber japonicus),horse mackerel(Trachurus trecae)and round sardinella(Sardinella aurita),and the environmental factors in Mauritanian waters were analyzed by using 4 years of logbook data of commercial purse seine fisheries to improve the efficiency of fishery and management of sustainable exploitation.A Tweedie-generalized additive model(GAM)of 8-day average catches and the monthly geostatistical analysis of daily catches were used in this study to analyze the influence of environmental factors on catch per unit of effort(CPUEs)and to map the spatial distribution of three mixed dominant small pelagic fishes,respectively.A 10'×10' grid was used,and environmental factors were processed from remote sensing,including 8-day average sea surface temperature(SST),the nearest distance between SST fronts and CPUE position(Df),chlorophyll-a(Chl-a)concentration,salinity,and eddy kinetic energy.Results showed that 1)the distribution of three dominant small pelagic fishes might be related to the intensity of upwelling in Mauritanian waters;2)oceanic fronts might play a key role in the ecology of chub mackerel,horse mackerel,and round sardinella;3)Chl-a concentration might be associated with the feeding grounds of chub mackerel;4)the target species distribution appeared sensitive to gradient changes in the amount of salinity;5)three zones(northern,central,and southern)with variable abundances were delineated;and 6)a high concentration of the center of gravity in the central zone might be related to the strong upwelling of nutrient-rich waters.This study can provide new insights to enhance the fishery efficiency and sustainable exploitation management of purse seiners in certain area off Mauritania. 相似文献
8.
Sun Xuexing 《中国海洋湖沼学报》1986,4(3):227-238
Scales of the Lake Anchovy in Taihu Lake are used as a basis for its age determination. Annual variation of scale edge growth
rate (α) indicates that the annulus forms once a year, mainly in April–June. The relationship formula for body length and
scale diameter is L=18.658+118.06R, that for body length and weight isW♀=7.588×10−6
L
2.8301;W♂=5.584×10−6
L
2.8781. The fish before age II have a higher relative growth rate in body length and weight and a higher growth index. Growth is
consistent with the growth equation by Von Bertalanffy. The turning point of the body weight growth curve is located between
age II and III; the exact position is atW=0.292W
∞. Variation specificity of the growth course can be reflected by the growth rate and its acceleration curves. Time for capture
of the fish should preferably be after age II, when they have reached a body length of 170 mm. That is one of the key measures
to increase Lake Anchovy production in Taihu Lake. 相似文献
9.
湛江北部湾马氏珠母贝红壳色选育系生长模型研究 总被引：1，自引：0，他引：1
为检验不同模型对马氏珠母贝红壳色选育系的生长发育拟合效果,分别采用von Bertalanffy、Gompertz、Logistic和Brody 4种非线性生长模型对红壳色选育系壳长、壳宽、壳高等形态性状和重量性状的生长发育进行拟合,通过Levenberg-Marquardt迭代法求出模型中各生长参数,结合各参数的最优值,得出拟合效果最佳的生长模型。结果表明,在马氏珠母贝红壳色选育系的第一年半生长过程中,Brody模型为壳长、壳宽与壳高的最优生长模型,von Bertalanffy模型为体重的最优生长模型,分别有效地拟合了马氏珠母贝红壳色选育系早期生长发育的累积生长曲线。 相似文献
10.
The effect of dietary phosphorus on the growth and body components of juvenile Synechogobius hasta was determined. Different percentages of dietary phosphorus (0.63, 0.77, 0.93, 1.06, 1.22 and 1.36) were tested by feeding
the fish (body weight, 15.81 g ± 0.32 g; 20 individuals each group; 3 groups each percentage) at a surplus of 5%–10% above
satiation for 35 d. Dietary phosphorus did not significantly affect the specific growth rate, feed intake, feed conversion
ratio and protein efficiency rate. Nitrogen retention was found to be the highest in fish fed the diet containing 1.06% of
phosphorus; however, this was not significantly different from other diets. Fish fed the diet containing 0.93% of phosphorus
showed the highest phosphorus retention; similar phosphorus retention rates were found in fish fed the diets containing 0.77%
and 1.06% of phosphorus. Fish fed the diet containing the highest percentage of dietary phosphorus were found to contain the
least whole body lipid, lower than fish fed other diets (P<0.05). The protein content increased from 18.59% to 19.55% (although not significant) with the decrease of body lipid content
(P>0.05). The contents of the whole body ash, whole body phosphorus and vertebrae phosphorus increased with dietary phosphorus
percentage up to 1.06 (P<0.05), reaching a plateau after that. Dietary phosphorus did not significantly influence the muscle components (protein,
lipid and moisture). Condition factor and hepatosomatic index were the highest in fish fed the diet containing 0.63% of dietary
phosphorus; however, this was not significantly different from those of other diets. The second-order polynomial regression
of phosphorus retention against dietary phosphorus identified a breakpoint at 0.88% of dietary phosphorus. However, the dietary
requirement of phosphorus for maintaining maximum phosphorus storage determined by broken-line analysis of the contents of
whole body phosphorus, and ash and vertebrae phosphorus was 1.06% of the diet. 相似文献
11.
Fish assemblage structure in the hypoxic zone in the Changjiang (Yangtze River) estuary and its adjacent waters were analyzed
based on data from bottom trawl surveys conducted on the R/V Beidou in June, August and October 2006. Four fish assemblages were identified in each survey using two-way indicator species analysis
(TWIA). High fish biomass was found in the northern part, central part and coastal waters of the survey area; in contrast,
high fish diversity was found in the southern part of the survey area and the Changjiang estuary outer waters. Therefore,
it is difficult to maintain high fishery production when high fish diversity is evenly distributed in the fish community.
Fish became smaller and fish size spectra tended to be narrower because of fish species variations and differences in growth
characteristics. Fish diversity increased, the age to maturity was reduced and some migrant species were not collected in
the surveys. Fish with low economic value, small size, simple age structure and low tropic level were predominant in fish
assemblages in the Changjiang estuary and its adjacent waters. The lowest hypoxic value decreased in the Changjiang estuary
and its adjacent waters. 相似文献
12.
The relation between otolith weight (OW) and the age of marine fish is studied. A total of 222 individuals of bighead white
croaker, Pennahia macrocephalus were sampled seasonally in the mouth of the Beibu Gulf, the South China Sea, in 2007. Since there are no significant differences
in sagittal OW between otolith in pairs (P≥0.05), the undamaged left sagittal otolith is used for age determination. The highest correlations among standard length,
OW and fish ages are confirmed by linear, exponential and multinomial regression. Results show that sagittal OW overlaps only
occasionally among age groups, and to individuals with similar standard length, the older and slower-growing fish has a heavier
otolith because of the continued otolith material deposition. There are differences in sagittal OW among different age groups
and significant positive linear relationship with age (P<0.05). The age readings can be verified by plotting the sagittal OW versus the standard length for age groups, and the individuals
with similar standard length but in different ages can be separated by sagittal OW frequency analysis. Mostly, the predicted
ages using the regression between sagittal OW and ages are closed to the observed ages by counting annulus on scale. It indicates
that the sagittal OW analysis is a useful technique for validating the accuracy of age determination by annuli counts, especially
for individuals of similar size. Furthermore, the technique is applied for Pennahia macrocephalus with discussion in this paper.
Supported by the National Natural Science Foundation of China (No. 30771653) and Bureau of Fisheries, Ministry of Agriculture 相似文献
13.
马氏珠母贝壳长生长模型研究 总被引：1，自引：0，他引：1
以Cp统计量作为确定马氏珠母贝壳长最优生长模型的准则,通过Levenberg-Marquardt迭代法求出模型中各生长参数,用Brody、von Bertalanffy、Gompertz、Logistic和Richards 5个生长模型对马氏珠母贝壳长的生长进行了拟合。结果表明,在马氏珠母贝生长的第一年中,壳长生长过程遵循Brody生长模型,其壳长生长极限值为56.572 mm(43.807～69.337,95%置信区间)。 相似文献
14.
The disease resistance and humoral immunomodulatory effects of vitamin C administered orally to grouper,Epinephelus awoara maintained on a frozen fish diet supplemented with vitamin C at 500, 1000, 1500 and 2000 mg/kg were investigated. After 20
weeks, the growth rates of the groups with high level of vitamin C apparently increased. The untreated fish had symptoms of
vitamin C deficiency. The endogenous liver tissue vitamin C levels were found to reflect well the dietary treatments. After
intraperitoneal injection or bath challenge with a virulent strain ofVibrio vulnificus, fish fed with high level vitamin C showed significantly higher survival rate compared with the normal control group. Vaccination
with formalin inactivatedV. vulnificus significantly enhanced the specific antibody production in fish treated with vitamin C, and completely protected from strong
bacterial challenge the groups fed on fish with vitamin C 1500 and 2000 mg/kg diet.
Project 39500113 supported by NSFC and also by Guangdong Science Research Foundation (Grant No. 950711). 相似文献
15.
British Antarctic Survey (BAS) data collected near the Antarctic Peninsula area were used in this 1988/1989 study on the length
frequency of three Antarctic fish species (Pleuragramma antarcticum, Electrona antarctica and Protomyctophum bolini) showing that the standard length (SL) ofP. Antarcticum ranged from 26.0 mm to 161.0 mm, that the 26.0 mm to 54.0 mm SL juveniles could be considered to be the age group 1 fish,
and that the SL ofE. antarctica ranged from 39.4 mm to 89.7 mm for the males and 48.0 mm to 118.0 mm for the females, which may contain at least 6 age groups.
This is more than previously thought.P. Bolini had 29.2 mm to 60.2 mm SL and complicated age composition. 相似文献
16.
Population parameters and dynamic pool models of commercial fishes in the Beibu Gulf, northern South China Sea 总被引：3，自引：0，他引：3
Length-frequency data of eight commercial fish species in the Beibu Gulf (Golf of Tonkin), northern South China Sea, were collected during 2006-2007. Length-weight relationships and growth and mortality parameters were analyzed using FiSAT II software. Five species had isometric growth, two species had negative allometric growth, and one species had positive allometric growth. Overall, the exploitation rates of the eight species were lower in 2006-2007 than in 1997-1999: for four species (Saurida tumbil, Saurida undosquamis, Argyrosomus macrocephalus, and Nemipterus virgatus) it was lower in 2006-2007 than in 1997-1999, for two species (Parargyrops edita and Trichiurus haumela) it remained the same, and for the other two species (Trachurus japonicus and Decapterus maruadsi) it was higher in 2006-2007 than in 1997-1999. The exploitation rates might have declined because of the decline in fishing intensity caused by high crude oil prices. The optimum exploitation rate, estimated using Beverton-Holt dynamic pool models, indicated that although fishes in the Beibu Gulf could sustain high exploitation rates, the under-size fishes at first capture resulted in low yields. To increase the yield per recruitment, it is more effective to increase the size at first capture than to control fishing effort. 相似文献
17.
Hybrids between olive flounder Paralichthys olivaceus and stone flounder Kareius bicoloratus： karyotype, allozyme and RAPD analyses 总被引：2，自引：0，他引：2
The hybrid between olive flounder Paralichthys olivaceus and stone flounder Kareius bicoloratus was produced by artificial insemination of olive flounder eggs with stone flounder sperm. Sinistral and dextral are two types
of hybrid progeny after metamorphosis. Karyotypes of both hybrid flounders are the same as those of the two parental species.
Of the 22 loci examined from 12 allozymes, 12 confirmed hybridization of the paternal and maternal loci in hybrids and no
difference was found in allozyme patterns of sinistral and dextral hybrid fishes. RAPD patterns of these specimens were also
studied with 38 primers selected from 104 tested. Among them, the PCR products of 30 primers showed hybridization of the paternal
and maternal bands. Genetic variation between hybrids and their parental stocks was analyzed by RAPD using 10 of the above
38 primers. The average heterozygosity and genetic distance were calculated. The results suggested that the filial generation
could inherit a little more genetic materials from paternal fish than that from maternal fish.
Supported by National Natural Science Foundation of China (No. 30571445), National High-Technology Research and Development
Program (863 Program, No. 2006AA10A404), and Project from the Ministry of Science and Technology of China (No. 2006DKA30470-017) 相似文献
18.
Bacterin was prepared by formalin-inactivating the virulent strain of Vibrio hollisae isolated from diseased Seriola dumerili （amberjack） suffering from vibriosis. Healthy S. dumeriIi were vaccinated by respective procedures of intramuscular injection, immersion, and orally administration. Results of the three different vaccinations were compared. Blood was drawn from the vaccinated fish every 7 days, and the antibody titers and lysozyme activities of the sera were determined. The antibody titer of injected fish was 1：40 at 7 d, and reached its peak of 1：320 at 28 d, while the fish vaccinated by immersion and orally administration exhibited weak antibody responses, the antibody titres of 〈1：10, 1：20, 1：160 were observed at 7 d, 14 d, 35 d respectively. Compared with the control, the vaccinated fish exhibited significantly higher lysozyme activities （P〈0.05）. Upon challenge with virulent strain, the relative percent survival （RPS） of injected, immersed and oral administrated fish were 75%, 45%, and 40% respectively, and the injected fish showed significantly higher RPS than immersed and oral administrated fish. The results suggested that vaccination of S. dumerili by the injection would be the best strategy to prevent the vibriosis in S. dumerili farm. 相似文献
19.
A study was conducted to evaluate the effects of meat and bone meal (MBM) and poultry by-product meal (PBM) as the replacement
of fish meal in the diets on the growth performance, survival and apparent digestibility coefficients (ADC) of Litopenaeus vannamei. The basal diets were formulated with 22% fish meal and other ingredients which provided about 40% protein and 9% lipid in
the diet. The experimental diets included MBM or PBM to replace 0, 20%, 40%, 60% and 80% of total fish meal respectively.
All diets were iso-nitrogenous and isocaloric in gross terms. The results showed that there were no significant differences
(Pτ;0.05) in growth performance and ADC among the treatments fed with the diets in which 0–60% fish meal had been replaced with
MBM, while the percent weight gain (WG, %), body length gain (BLG, %) and ADC significantly decreased when the MBM was up
to 80% of the fish meal. There were no significant differences (Pτ;0.05) in growth performance and ADC among all the treatments fed with the diets in which 0–80% fish meal had been replaced
with PBM. 相似文献
20.
The status of fishery stocks in the coastal waters of China is far from ideal, mainly due to climate change and the impacts
of human activities (e.g., pollution and overfishing). Thus, the restoration and protection of fishery resources have become
critical and complex. The stability and balanced structure of the fish community is a basic foundation for the protection
of fishery resources. Based on data collected from bottom trawls by the R/V Beidou in continental shelf of the East China Sea in November 2006 and February 2007, changes in the composition and diversity of
fish species and functional groups were analyzed. The research area was divided into offshore waters and inshore waters by
the two-way indicator species analysis (TWIA). The results showed that the dominant species were different between offshore
waters and inshore waters and also varied with the survey time. The most abundant family was Sciaenidae and Teraponidae in
November 2006, Sciaenidae, Engraulidae and Triglidae were most abundant in February 2007. The species belonged mainly to mobile
piscivores (G6), benthivores/piscivores (G4), benthivores (G3) and planktivores (G1), and the dominant species in November
2006 were commercial species (e.g. Larimichthys polyactis and Trichiurus japonicus), but small-sized species were dominant in February 2007 (e.g., Harpadon nehereus, Benthosema pterotum, Champsodon capensis, and Acropoma japonicum). The species diversity showed a similar trend as the functional group diversity. Stations with higher diversity were mainly
distributed in inshore waters in February 2007, whereas higher diversity was found in offshore waters in November 2006. The
highest biomass and species number were found in G6 group, followed by the G4, G5 and G1 groups. The distribution of the number
of individuals of each functional group showed the opposite trend as that of the biomass distribution. In addition, the size
spectra were mainly concentrated around 3–29 cm, and the individual number of fish species gradually decreased with the increase
in body size, but the relative biomass showed a moderate fluctuation in each size class. These changes showed that species
with faster growth rate and earlier maturity age became dominant in continental shelf of the East China Sea. So the variations
in biological characteristics of fish should be fully considered in maintaining sustainable utilization of fishery resource. 相似文献