Hematodinium spp. infections in wild and cultured populations of marine crustaceans along the coast of China

2017 ◽  
Vol 124 (3) ◽  
pp. 181-191 ◽  
Author(s):  
JF Wang ◽  
M Li ◽  
J Xiao ◽  
WJ Xu ◽  
CW Li
Keyword(s):  
Marine Crustaceans

Do marine crustaceans release dissolved amino acids?

1969 ◽  
Vol 29 (2) ◽  
pp. 875-878 ◽  
Author(s):  
Kenneth L. Webb ◽  
R.E. Johannes
Keyword(s):  
Amino Acids ◽  
Marine Crustaceans

Transmembrane Activity Gradients of K and cl in the Muscle Fibres of Osmoconforming Marine Decapod Crustaceans

1978 ◽  
Vol 72 (1) ◽  
pp. 127-140
Author(s):  
ROBERT W. FREEL
Keyword(s):  
Sea Water ◽  
Membrane Potentials ◽  
Resting Potential ◽  
Muscle Fibres ◽  
Salinity Adaptation ◽  
Decapod Crustaceans ◽  
Marine Crustaceans ◽  
Equilibrium Distributions

1. The resting membrane potentials (Em) and the transmembrane activity gradients for K and Cl were measured in the muscle fibres of osmoconforming (Callianassa and Cancer) and weakly osmoregulating (Pachygrapsus) marine crustaceans acclimated to various osmotic conditions. 2. The muscle membranes of sea water acclimated crabs behave as good K electrodes. However, a slight contribution of Na to the resting potential was demonstrated in all species. The ratio PNa/PK was about 0.01. Equilibrium potentials (measured with ion-selective microelectrodes) for Cl were equal to Em, while EK was always more negative than Em as a result of the slight Na contribution. 3. Acclimation to dilute or concentrated sea water had little effect on the K electrode properties or Na permeabilities of these fibres. The muscle fibres were depolarized in crabs acclimated to concentrated sea water and were hyperpolarized in crabs adapted to dilute sea water. These changes resulted solely from alterations in (aK)i/ (aK)O which were in turn brought about by changes in cellular and haemolymph hydration. 4. Since the Na contribution to Em was so small in all conditions, it was concluded that the distributions of K and Cl are best considered in terms of Donnan equilibria, and that the cellular K and Cl adjustments observed during salinity adaptation reflect the passive re-establishment of new equilibrium distributions for these ions.

scholarly journals Analisis Pigmen dan Aktivitas Antibakteri In Vitro Pigmen Astaksantin Kepiting (Grapsus albolineatus Lamarck) Jantan

2006 ◽  
Vol 8 (2) ◽  
pp. 160
Author(s):  
Aswan Thamin ◽  
Chairulwan Umar ◽  
Darussadah Paransa
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Enterobacter Cloacae ◽  
Bacteriostatic Activity ◽  
North Sulawesi ◽  
Marine Crustaceans ◽  
Activity Test ◽  
In Vitro Antibacterial Activity

Grapsus albolineatus is one of marine crustaceans which have carotenoid (astaxanthin) pigment. This research was conducted to analyze carotenoids (astaxanthin) extracted from G. albolineatus, and evaluate their in vitro antibacterial activity. The research was done in March-July 2002. Samples were collected from Manado Gulf, North Sulawesi. The result indicated that the carapace contained 4 carotenoids namely ß-caroten, ecinenon, astaxanthin diester, and astaxanthin monoester. In addition, the epidermis contained free astaxanthin. In vitro antibacterial activity test indicated that astaxanthin had low bacteriostatic activity against Psedomonas aeruginosa, Enterobacter cloacae, Staphylococcus aureus, and Proteus stuartii.

Larvae and Direct Development

2018 ◽  
pp. 151-178
Author(s):  
Richard R. Strathmann
Keyword(s):  
Larval Stage ◽  
Life Histories ◽  
Marine Invertebrates ◽  
Larval Feeding ◽  
Evolutionary Transitions ◽  
Evolutionary Origins ◽  
Marine Crustaceans ◽  
Oxygen Capacity ◽  
Marine Larvae ◽  
Maternal Protection

Modes of development of marine crustaceans and other marine invertebrates include presence or absence of a larval stage, of larval feeding, and of maternal protection of offspring. These different developmental modes impose different compromises (trade-offs) between the number of offspring and their size or the extent of maternal protection. Crustaceans differ from many marine animals in not shedding eggs prior to fertilization, which eliminates the complication of selection on size of eggs as a target for sperm. Features shared with marine invertebrates of several phyla include rare and ancient origins of feeding larvae, irreversible losses of a feeding larval stage, a constraint on brooding imposed by embryos’ need for oxygen, and possible benefits from slower development of protected embryos. Crustaceans differ, however, in having a diverse exoskeletal tool kit that has provided unusual capabilities. Nauplii and zoeae are diverse in form, behavior, and habitat, despite each being nominally one type of larva. Nauplii, as feeding larvae, have adapted to both the benthos and plankton. Settling stages (cyprids and decapodids) with enhanced speed have evolved twice. Some very large adults can supply their large broods with oxygen. Capacity for defense of offspring and home has led a few times to eusociality. The need to molt to grow and change form imposes episodic risk and growth and, in some cases, links evolution of egg size and size at metamorphosis. Crustaceans’ diverse life histories enable comparisons with broad implications for marine invertebrates: opportunity for dispersal is similar for larvae and adults of some crustaceans, demonstrating that marine larvae need not be adaptations for dispersal; development from very small eggs is enabled by less equipment needed for first larval feeding and also by postlarval stages being parasites; eggs shed into the water suffer greater mortality than planktonic larvae or brooded eggs, yet some planktonic crustaceans depend on benthic resting eggs for persistence of populations; larvae escape predation in diverse ways, and bigger larvae are not consistently safer; predation near the seafloor makes settlement a risky stage. Parallels with other taxa are numerous, but the crustacean exoskeletal tool kit has conferred unusual evolutionary opportunities and constraints. Even among marine crustaceans, however, evolutionary options for life histories differ among clades because of rare evolutionary origins of traits of larvae and mothers and biased evolutionary transitions in those traits.

Relationships between the sex and degree of maturity of marine crustaceans and their lipid compositions

1973 ◽  
Vol 53 (1) ◽  
pp. 27-37 ◽  
Author(s):  
R. J. Morris
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Saturated Fatty Acids ◽  
Energy Reserves ◽  
Specific Difference ◽  
Marine Crustaceans ◽  
Polyunsaturated Acids ◽  
Males And Females ◽  
Degree Of Maturity ◽  
Gravid Females

The results of decapod lipid analyses have shown that females and gravid females generally contain high levels of monounsaturated acids and that the eggs of some of these decapods are composed mainly of phospholipid and triglyceride. These are probably present mainly as energy reserves. The percentages of saturated fatty acids are not found to vary with either maturity or sex, whereas the composition of the polyunsaturated acids are affected by both sex and maturity differences. Females are generally much lower in their content of polyunsaturated acids than juveniles and males, the males showing a greater requirement for 20:5 acid compared to the females.For the euphausiids there is a slightly different picture, the monounsaturated acids appear as the stable fraction and for Euphausia krohnii the juveniles are similar to the females in their content of the polyunsaturated acids.Neomysis integer is quite unlike the oceanic crustaceans showing a very specific difference in fatty acid composition between the males and females, the juveniles being rather intermediate in composition.

scholarly journals DNA barcoding of marine crustaceans from the Estuary and Gulf of St Lawrence: a regional-scale approach

2009 ◽  
Vol 9 ◽  
pp. 181-187 ◽  
Author(s):  
ADRIANA E. RADULOVICI ◽  
BERNARD SAINTE-MARIE ◽  
FRANCE DUFRESNE
Keyword(s):  
Dna Barcoding ◽  
Regional Scale ◽  
Marine Crustaceans
Sign in / Sign up

Export Citation Format

Share Document