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1.
The effect of stocking density on the survival and growth of pikeperch, Sander lucioperca (L.), larvae was examined in two consecutive experiments. In experiment I, 4-day-old larvae [body wet weight (BW): 0.5 mg;
total body length (TL): 5.6 mm] were reared in 200-l cylindro-conical tanks in a closed, recirculating system (20 ± 0.5°C)
at three stocking densities (25, 50 and 100 larvae l−1) and fed a mixed feed (Artemia nauplii and Lansy A2 artificial feed) for 14 consecutive days. At densities of 25 and 100 larvae l−1, growth rate and survival ranged from 2.7 to 1.9 mg day−1 and from 79.2 to 72.3%, and fish biomass gain ranged from 0.6 to 2.0 g l−1, respectively. There were two periods of increased larval mortality: the first was at beginning of exogenous feeding and
the second during swim bladder inflation. In experiment II, 18-day-old larvae (BW: 35 mg; TL: 15.6 mm) obtained from experiment
I were reared under culture conditions similar to those of experiment I, but at lower stocking densities (6, 10 and 15 larvae
l−1). The fish were fed exclusively with artificial feed (trout starter) for 21 consecutive days. At densities of 6 and 15 larvae
l−1, the growth rate and fish biomass gain ranged from 28.8 to 23.1 mg day−1 and from 2.0 to 3.3 g l−1, respectively. The highest survival (56.5%) was achieved at a density of 6 larvae l−1. Mortality at all densities was mainly caused by cannibalism II type behaviour (27–35% of total). In both experiments, growth
and survival were negatively correlated and fish biomass gain positively correlated with stocking densities. The present study
suggests that the initial stocking density of pikeperch larvae reared in a recirculating system can be 100 individuals l−1 for the 4- to 18-day period post-hatch and 15 individuals l−1 for the post-19-day period. 相似文献
2.
Jesus D. Celada Amelia Aguilera Jose M. Carral María Sáez-Royuela Pedro M. Melendre Jose R. Pérez 《Aquaculture International》2007,15(6):461-465
In two 120-day experiments, performed in the laboratory at 22°C, the effects of stocking density on the survival and growth
of juvenile tench (Tinca tinca L.) were evaluated. Fish were kept in fibreglass tanks, supplied throughout with flow of artesian water, and fed a dry diet
for salmonids, in excess, supplemented with restricted amounts of Artemia nauplii. In the first experiment four-month-old juveniles (0.31 ± 0.04 g and 32.00 ± 1.17 mm TL) were stocked at four densities—0.18,
0.88, 1.05, and 2.10 g l−1. Survival was high (>89%) for all treatments. Final densities ranged between 1.10 g l−1 (significantly lowest) and 10.46 g l−1 (significantly highest). The density increase was significantly higher (611%) for fish stocked at the lowest initial density
(0.18 g l−1) than for fish stocked at 0.88, 1.05, and 2.10 g l−1, for which the density increase averaged 457%. In the second experiment, 4.5-month-old juveniles (0.58 ± 0.17 g and 39.54 ± 0.83 mm
TL) were stocked at three densities—1.05, 3.00, and 4.00 g l−1. Survival was high (>96%) for all treatments. Final densities ranged between 4.08 and 16.53 g l−1 and were significantly higher for greater initial densities. The density increase was greatest (413%) for fish stocked at
the highest density (4 g l−1) and was not significantly different for fish stocked at 1.05 and 3 g l−1. Considering all the densities in the two experiments, for stocking at 4 g l−1 the final density was 15 times higher than that reached after stocking at 0.18 g l−1, without harmful effects on survival and growth. This final density (equivalent to 16.53 kg m−3) is in the range recommended for other fish species in this period under intensive conditions. 相似文献
3.
Ofelia S. Reyes Marietta N. Duray Corazon B. Santiago Manuele Ricci 《Aquaculture International》2011,19(1):155-164
The free-living nematode, Panagrellus redivivus, was tested as live food for grouper Epinephelus coioides larvae during the first feeding stage. A series of experiments were conducted to determine the acceptability of the free-living
nematodes in grouper larvae at first feeding, the optimum nematode density and the response of the larvae to nutritionally
enriched nematode. All experiments were conducted in 200-L conical tanks filled with 150-L filtered seawater and stocked at
15 larvae L−1. Duration of feeding experiments was up to day 21 (experiment 1) and 14 days (experiment 2 and 3). Brachionus plicatilis and Artemia (experiment 1) and Brachionus plicatilis alone (experiment 2 & 3) was used as the control treatment. Observations indicated that the grouper larvae readily fed on
free-living nematodes as early as 3 days posthatching, the start of exogenous feeding. Optimum feeding density for the larvae
was 75 nematodes ml−1. The enrichment of cod liver oil or sunflower oil influenced the total lipids and n-3 highly unsaturated fatty acids of P. redivivus, which in turn influenced those of the grouper larvae, however, growth and survival of the larvae were not affected (P > 0.05). The results from this investigation showed that the nematode, P. redivivus, can be used as first live food for grouper larvae from the onset of exogenous feeding until they could feed on Artemia nauplii. 相似文献
4.
Thomas H. Galley Benjamin C. Green Lloyd Watkins Lewis Le Vay 《Aquaculture International》2011,19(2):381-394
The shore crab Carcinus maenas is a commercially important species, utilised as sea angling bait as well as supporting a European-wide fishery. Hatchery
production could provide an alternative source of bait crabs, alleviating potential competition between these sectors and
environmental concerns regarding bait collection practices. A series of experiments were carried to investigate the potential
for hatchery production, focusing on effects of dietary regimes and stocking densities through the zoeal stages and the influence
of tank substrates and stocking density during the megalopa stage. Inclusion of the rotifer Brachionus plicatilis as live food for early larval stages conveyed no advantage in terms of survival or rate of development compared to a diet
of Artemia nauplii. Increasing zoea stocking densities (from 94 to 557 l−1) had a significantly negative effect upon survival to the megalopa stage (from 75% down to 47%), although this was off-set
by a significant increase in production, with 260 megalopae−1 produced from an initial density of 557 zoeae l−1. The inclusion of substrates for megalopa stages had no impact on production or development rate, compared to tanks with
no substrate. The completely benthic behaviour of megalopae indicates that tank floor area will be a limiting factor for crab
production. Increasing stocking density of megalopae was found to significantly and negatively influence survival, although
above 10,000 megalopae m−2 the rate of decline in survival stabilised and maximum production (3,114 juveniles m−2) of juvenile crabs could be achieved at the highest stocking densities tested (40,000 m−2). 相似文献
5.
Tetsuya Takatsu Yuusuke Suzuki Akiko Shimizu Kazuo Imura Yuko Hiraoka Naonobu Shiga 《Fisheries Science》2007,73(1):142-155
To clarify the feeding strategy of pelagic larvae of stone flounder in Mutsu Bay, the dietary composition and pray size was
investigated from February to April during 1989–1999. Diets were compared with the numerical and volumetric compositions and
frequency of occurrence of each prey species. Mensuration formulae were applied to estimate individual prey volume in the
diet, while the length of planktonic species was measured from net and water samples. Prey shapes were assumed as sphere,
cylinder, ellipsoid, pyramid, two elliptical cones, or a combination of ellipsoid and cylinder. Prey-size range increased
as the larvae grew. Preflexion larvae fed mainly on copepod nauplii. Flexion and postflexion larvae ingested primarily appendicularians,
with a suggestion that these larvae might depend on some parts of the microbial food web. Low frequencies of flexion and postflexion
larvae with empty guts (1.7 and 1.4%, respectively) might be derived from feeding on slow-swimming appendicularians. From
a size comparison between ‘house’-like organ length and trunk length of the appendicularian Oikopleura sp., almost all house-like organs with trunks in the larval diet were nonexpanded ‘house rudiments’, not expanded ‘houses’.
Thus, stone flounder larvae may not chew the houses, but swallow the house rudiments with trunks. 相似文献
6.
R. González J. D. Celada A. González V. García J. M. Carral M. Sáez-Royuela 《Aquaculture International》2010,18(3):371-378
Recent advances in intensive rearing of astacid juvenile crayfish have greatly improved the results. This challenges the current
application possibilities of the studies performed previously, and new research on density is required. A 100-day experiment
was carried out under controlled conditions to evaluate density effects on survival and growth rates of juvenile crayfish
in optimal conditions of feeding. Juvenile stage 2 Pacifastacus leniusculus were stocked in fibreglass tanks (1 m2, 200 l water) at 20 ± 1°C and fed a dry diet for salmonids supplemented with restricted amounts of Artemia nauplii. Stocking densities were 100, 300, 600 and 1,000 crayfish m−2. Mean survival rate was reduced significantly with increased stocking density, ranging from 86.33% (100 m−2) to 39.13% (1,000 m−2). All checks showed that at the lowest initial density (100 m−2) animals grew significantly faster those at higher densities, recording a final carapace length of 15.28 mm and weight of
1.08 g. Among the treatments of 300, 600 and 1,000 m−2 no differences were found either in carapace length or in weight throughout the experimental period, with a final mean growth
of 14 mm carapace length and 0.72 g weight. The final proportion of animals with chelae autotomy rose significantly with increasing
stocking density, ranging from 14.44% (100 m−2) to 41.45% (1,000 m−2). This study shows that diet is a decisive factor for stocking successfully high densities under controlled conditions and
provides useful information to set adequate densities in accordance with the production objectives. 相似文献
7.
The self-feeding abilities of individually reared rainbow trout Oncorhynchus mykiss were investigated under four different light intensities (7×10−2, 1×10°, 5×101, and 7×102 lx). There was no significant effect of light intensity on self-feeder learning ability and food wastage (which did not exceed
0.5%). However, there was high individual variability in the ability irrespective of light intensity. The total number of
trigger actuations was significantly higher at 1×10° lx than at 7×10−2 and 5×101 lx. Feeding patterns during the light phase of a day were classified as early or late in relation to the timing of significant
peaks in fish feeding, or non-steady. The last pattern was defined when significant peaks were not observed. Under 7×10−2, 1×10°, or 7×102 lx, a non-steady feeding pattern was the most common. Early feeding appeared only under the 1×10° lx regime with the random
pattern, while the late pattern was observed under 7×10−2, 5×101, and 7×102 lx. Under 5×101 lx regime half of the fish fed in the afternoon. These results suggest that light intensity can affect the timing of feeding
judged from the frequency of pulling bite tags, but does not affect waste or learning period. 相似文献
8.
Daniel Żarski Katarzyna Targońska Sławomir Krejszeff Maciej Kwiatkowski Krzysztof Kupren Dariusz Kucharczyk 《Aquaculture International》2011,19(6):1105-1117
Two experiments were conducted into the rearing of crucian carp larvae under controlled conditions in an experimental closed
water system. In both cases, the rearing lasted 21 days. The first experiment concerned the initial stocking density (from
50 to 600 individuals per l), whilst the second one studied the first food offered (two types of Artemia nauplii, decapsulated Artemia cysts and three types of commercial feeds) which were applied at the moment of exogenous feeding commencement. The best results
were obtained using 50 larvae per l, whilst there were no significant differences within the range 200–600 larvae per l. The
application of dry feed had a negative influence on the survival and other parameters. The highest survival rate was found
in the groups fed with freshly hatched Artemia naupli. The results obtained indicate that the rearing of crucian carp larvae may be successfully conducted in very high
stocking densities. However, the very high sensitivity of crucian carp larvae to the type of food offered during the initial
days of life should be taken into account. The data presented in this article could be very useful in crucian carp larviculture. 相似文献
9.
The ark shell Anadara granosa is a species peculiar to the Ariake Sound. To determine why distribution of A. granosa in Japan is largely confined to this area, we examined feeding and growth of A. granosa as functions of environmental and biological variables. The results were compared with those of another ark shell Scapharca subcrenata, which is ubiquitous in Japan. Feeding experiments indicated that A. granosa is eurythermal and euryhaline, as is S. subcrenata, but is adapted to temperature slightly higher than S. subcrenata. Weight-specific clearance rate (CR) of A. granosa as a function of soft-body dry-weight (w) followed the power function of w (CR=2.7×w
−0.37), with coefficient and exponent very close to those for S. subcrenata. Growth rate of A. granosa increased linearly with daily ration, similar to S. subcrenata. Thus, feeding and growth characteristics of A. granosa were comparable to those of S. subcrenata and no ‘peculiarities’ of the former were detected. Therefore, the factors that make A. granosa a species restricted to the sound are probably not directly related to feeding or growth characteristics. 相似文献
10.
Larval rearing experiments were conducted to examine the potential for mass seed production of the snow crab Chionoecetes opilio using a total of eight 20-kL tanks. Tanks were equipped with agitators, which move the water using a rectangular blade to
prevent the zoeas sinking to the bottom of the tank. Larval rearing water was treated with sodium nifurstyrenate once a week
to reduce the chance of larval infection by pathogenic bacteria. Zo eas were fed with rotifers and Artemia nauplii. A total of 122 830 megalops and 16 660 first-stage crabs were produced. Thus, the potential for mass seed production
of snow crab was determined. Survival rates up to the megalopal stage were high in tanks with a feeding regime that fed rotifers
to larvae through an entire zoeal stage. This study also describes the fatty acid composition of snow crab larvae. It revealed
that the first zoeas had a high DHA content and DHA/EPA ratio, but these values significantly decreased in the second stage
zoeas and megalops. Improving the DHA content and/or DHA/EPA ratio of larvae should be important in studies on mass seed production
technology of the snow crab. 相似文献
11.
Fernando G. Dellatorre Marcela S. Pascual Pedro J. Barón 《Aquaculture International》2007,15(6):415-424
The feeding behavior of Mytilus edulis platensis, one of the most important aquaculture resources on the East Coast of southern South America, was studied by analyzing clearance
rate (CR) and ingestion rate (IR) to test the hypothesis that cultivated mussels can attain higher clearance and ingestion
rates than their wild counterparts. A number of morphometric relationships between cultivated and wild mussels were also compared.
Gill surface (GS) growth relative to length (L) is isometric in M. e. platensis, with no significant differences between wild and cultivated mussels. At low food concentrations (<15 Chaetoceros gracilis cells μl−1), the CR is maximum and similar in both cultivated and wild mussels, decreasing when the concentration of experimental food
surpasses a threshold level. This concentration threshold is higher in cultivated mussels than in wild ones. While culture
conditions do not affect either GS growth or potential CR, they do affect CR regulation patterns in response to fluctuations
in food concentration, allowing the attainment of higher maximum IR. 相似文献
12.
Hongxia Liu Meiqin Yi Xueyan Shi Pei Liang Xiwu Gao 《Fish physiology and biochemistry》2007,33(1):29-34
The substrate specificity of brain acetylcholinesterase (AChE) in adult Carassius auratus fish and its sensitivity to carbamate insecticides were investigated in vitro. The results showed that the order of four
substrates hydrolyzed by brain AChE in C. auratus was acetylthiocholine iodide > β-methylthiocholine iodide > propionylthiocholine iodide > butyrylthiocholine iodide, and
the maximum velocity (V
max) of AChE hydrolyzing acetylthiocholine iodide (ATCh) was the highest among the four substrates, and the V
max values were 0.067 and 0.082 mmol min−1 mg−1 for male and female fish respectively. But their Michaelis–Menten constants (K
m) were the lowest, only 0.071 and 0.072 mmol/l respectively. Compared with other carbamate insecticides, the sensitivity of
brain AChE to carbofuran was the highest and the IC50 values were 1.04 × 10−6 mol/l for females and 1.17 × 10−6 mol/l for males. The inhibitory tendencies of eserine, methomyl, and aldicarb to brain AChE were very similar, and the percentage
inhibition increased with time at the concentration of 1 × 10−6 mol/l. The order of inhibition potential of the three inhibitors from the highest to the lowest was eserine, aldicarb, and
methomyl. 相似文献
13.
Thomas H. Galley Frederico M. Batista Richard Braithwaite Jon King Andy R. Beaumont 《Aquaculture International》2010,18(3):315-325
The blue mussel Mytilus
edulis is a commercially important species whose fishery and culture generally relies on natural spat collection. Hatchery-production
could provide an alternative source of seed, enabling reliable expansion of the industry. Mussel spawning and larval rearing
trials were carried out to optimise elements of hatchery production. Culturing fertilised eggs at low density (20–200 eggs cm−2) rather than high density (400–720 eggs cm−2) significantly improved the quality of first veliger larvae and differences in this improvement were evident between the
eggs from different females (maternal effects). Veliger larval growth at 17 or 21°C was significantly faster than growth at
14°C. Feeding veliger larvae an identical total ration either daily or at 2–3 day intervals did not significantly affect their
growth. Different microalgal diets (1: Isochrysis sp. (clone T-ISO), 2: Chaetoceros
calcitrans forma pumilus, 3: C. muelleri, 4: mixed Isochrysis sp. (clone T-ISO) and C. calcitrans f. pumilus, and 5: mixed Isochrysis sp. (clone T-ISO) and C. muelleri) were tested on veliger larval growth and mixed diets outperformed single-species diets. 相似文献
14.
The giant freshwater prawn, Macrobrachium rosenbergii, is cultured widely in the Mekong Delta region of Vietnam but it is often difficult or expensive for hatchery operators to
purchase commercial diets used as a feeding supplement to Artemia nauplii. Therefore, in the present study, the effects of lipid sources and lecithin on the growth and survival rate of M. rosenbergii larvae were examined in order to develop suitable hand-prepared larval diets for seed production of M. rosenbergii in this area. Six egg custard diets consisting of various ratios of lipid (originating from soybean oil and squid oil) and
lecithin were used for rearing Macrobrachium rosenbergii larvae. Treatments in which larvae were fed diets containing squid oil exhibited the highest body length and survival rates
(7.14–7.43 mm and 51.1–68.1%, respectively), and differed significantly from other treatments (P<0.05). Use of dietary soybean oil yielded the lowest body length and survival rates (6.29–6.75 mm and 22.0–48.7%), respectively).
The supplementation of dietary lecithin did not increase final body weight but did improve larval survival rates. The n-3
HUFA content of prawns fed dietary squid oil was higher than those of animals provided with other diets. These results indicated
that the most appropriate diet for rearing M. rosenbergii larvae is the diet containing 3% squid oil and 1.5% lecithin. 相似文献
15.
J. W. Huang L. X. Tian Z. Y. Du H. J. Yang Y. J. Liu 《Fish physiology and biochemistry》2007,33(2):167-172
This study was conducted to evaluate the effects of dietary thiamin on the physiological status of the juvenile grouper, Epinephelus coioides. Graded levels of thiamin (0.08, 0.50, 2.12, 3.15, 4.63, 12.37 mg thiamin kg−1 diet) were fed to grouper juveniles (mean weight: 16.97 ± 0.14 g) for 10 weeks. Although fish fed the thiamin-deficient (TD)
diet showed no obvious symptoms of thiamin deficiency or increased mortality, those fed the lowest doses of thiamin (0.08
and 0.50 mg thiamin kg−1 diet) had significantly decreased transketolase activity in the liver. In addition, the level of liver thiobarbituric acid
reactive substances in fish fed the TD diet was 33–67% higher than that in fish with the thiamin-supplemented diet. There
were no significant differences in superoxide dismutase activity between the different groups of fish. 相似文献
16.
Growth and ontogeny of digestive function were studied in pikeperch (Sander lucioperca) larvae weaned on artificial food at different ages. Three weaning treatments initiated respectively on day 9 (W9), day 15
(W15) or day 21 (W21) post-hatching (p.h.) were compared with a control group, fed Artemia nauplii from first feeding until the end of the rearing trial on day 36 p.h. The digestive enzyme activities and the ontogeny
of digestive structures were investigated using enzymatic assays and histological methods. Growth of pikeperch larvae was
significantly affected by precocious weaning. Pancreatic (trypsin and amylase) and intestinal (leucine-alanine peptidase,
leucine aminopeptidase N and alkaline phosphatase) enzyme activities were detected from hatching onwards, increased at the
moment of first feeding and then decreased. Pepsin secretion occurred at day 29 p. h. only, concurrently with the stomach
development and differentiation of gastric glands. In the early weaning group (W9) the maturation process of intestinal enterocytes
seems to be impaired and/or delayed and several signs of malnutrition were recorded. Except for alkaline phosphatase activity,
no differences in enzyme activities and development of digestive structures were observed among the control, W21, and W15
groups. Moreover, at the end of the experiment, no differences in proteolytic activities were observed among larvae from the
different treatments, indicating that, in surviving individuals, the digestive structures were properly developed and the
larvae had acquired an adult mode of digestion. Based on the artificial diet used, our results suggested that pikeperch larvae
can be weaned from day 15 p.h. without significant adverse effect on digestive capacities (except for alkaline phosphatase)
or development of digestive tract, while earlier weaning impaired the onset of the maturation processes of the digestive system,
both in terms of morphological structures and enzymatic activities. 相似文献
17.
Albert K. Imsland Edward Schram Bjorn Roth Rian Schelvis-Smit Kees Kloet 《Aquaculture International》2007,15(5):403-407
The effect of thermal history (16 and 20°C) on growth of juvenile turbot, Scophthalmus maximus (initial mean weight 72.6 g, n = 157) was studied. Fish were divided into four groups, two groups remaining at constant temperature (C16, C20), while fish
in the other groups were transferred from either 16 to 20°C (F16-20) or from 20 to 16°C (F20-16). Between 35 and 42 fish in
each tank were individually tagged at the start of the experiment. The final mean weights were significantly higher in the
F20-16 group (230 g) than in the C20 (213 g), F16-20 (211 g) and C16 (205 g) groups. The overall growth rate was highest in
the F20-16 group (1.17% day−1) but comparable in the three other groups (1.00–1.04% day−1). Our findings indicate that, even at near-optimal temperature for a given size, the temperature history of the fish may
influence future growth. Based on these indications, we conclude that as turbot grow larger, the temperature should be reduced
to take advantage of the change in optimal temperature for growth with increasing fish size rather than rearing at constant
temperatures. 相似文献
18.
Sanjoy Banerjee Helena Khatoon Mohamed Shariff Fatimah Md. Yusoff 《Fisheries Science》2010,76(3):481-487
We have investigated the possibility of using a consortium of marine bacterium and periphytic microalgae to improve the water
quality and increase the growth and survival of the shrimp Penaeus monodon in a hatchery system. Three treatments were evaluated for their effect on P. monodon postlarvae (PL) when the culture water was not changed: Bacillus
pumilus alone (B); periphytic microalgae alone (M); B. pumilus + periphytic microalgae (BM). P. monodon PL raised in a tank of unchanged water without bacterium and periphytic microalgae served as the control. The water in tanks
of the M and BM treatments had significantly low levels of total ammonia-nitrogen (TAN) (0.03 and 0.01 mg l−1, respectively) and nitrite-nitrogen (NO2-N) (0.03, 0.01 mg l−1, respectively) than that in the B (TAN 0.80, NO2-N 0.68 mg l−1) and control (TAN 1.11, NO2-N 1.12 mg l−1) tanks. Moreover, PL cultured in tanks M and BM had significantly higher survival and specific growth rates and a significantly
higher resistance to the reverse salinity stress test than those in the B and control tanks. Compared to the control PL, the
PL cultured in the BM tanks had significantly higher levels of protein, lipid, polyunsaturated fatty acids, ecosapentaenoic
acid, and docosahexaenoic acid. The culture water in tanks BM also contained significantly less Vibrio than the control water. Our results illustrate the beneficial effects of a B. pumilus and periphytic microalgae consortium on improving the water quality and the growth and survival of shrimp PL grown in a hatchery
system. 相似文献
19.
We have examined the effects of Tribulus terrestris (TT), a non-toxic herb, on sex reversal in the Convict Cichlid Cichlasoma nigrofasciatum with the aim of introducing a new environmentally friendly method for masculinization in C. nigrofasciatum. TT is a natural plant product that elevates the testosterone levels in humans and animals. Different concentrations (0.0,
0.10, 0.20 and 0.30 g/l) of TT extract were tested for their effect on sex reversal in C. nigrofasciatum by immersing newly hatched offspring once weekly for 2 months in TT extract. Of the dosages used in the present study, 0.30 g/l
TT was the most effective in terms of masculinization, resulting in a maximum male ratio of 87.23% (P < 0.001). Sex ratios of 79 and 85% at 0.10 and 0.20 g/l TT, respectively, were also significantly different from the expected
1:1 ratio (P < 0.001). Histological examinations revealed that the testes of fish treated with TT extract contained all stages of spermatogenesis,
clearly demonstrating that the administration of TT extract to C. nigrofasciatum stimulated spermatogenesis. Total survival rates in all treatments and the control were uniformly high, ranging from 88.57
to 90% (P > 0.05). We concluded that TT had no negative effect on the survival rate of C. nigrofasciatum. In addition, all groups of TT-treated fish exhibited successful growth acceleration compared to the control group, but only
the 0.30 g/l TT treatment significantly improved the growth rate of C. nigrofasciatum. (P < 0.01). Sex reversal in C. nigrofasciatum demonstrated that TT-treated 0-day-old larvae showed successful sex reversal, spermatogenesis and a better growth rate than
untreated progenies. 相似文献
20.
Shion Kawai Yuuki Takada Shinji Tsuchida Ryusuke Kado Junji Kimura 《Fisheries Science》2007,73(4):902-906
From the two species of bivalves, Calyptogena soyoae around a cold seep and Bathymodiolus septemdierum near hydrothermal vents in the sea, sterols were isolated using high-pressure liquid chromatography analysis of the lipid
fraction guided by characteristic 1H NMR signals of the sterol skeleton. The minor sterol composition of C. soyoae included 24-methylenecycloartanal, cycloeucalenol, and obutusifoliol, which are known phytosterols. From B. Septemdierum, lathosterol and cholesterol as main sterols together with more diverse sterols were obtained. The difference between these
species and their sterol contents is most likely because of feeding modes and metabolism of nutrients from their habitat. 相似文献