Results show the importance of using lower/natural temperatures during oocyte maturation and ovulation to obtain good quality eggs in photo-manipulated cod broodstock.
| Aquaculture Research | |||||||||||||||||
| Volume 44, Number 1 (December 2012) | |||||||||||||||||
| |
Importance of broodstock holding temperature on fecundity and egg quality in three groups of photo-manipulated Atlantic cod broodstock | ||||||||||||||||
| Authors: | Øyvind J Hansen, Velmurugu Puvanendran, Atle Mortensen | ||||||||||||||||
| Author Affiliations: |
|
||||||||||||||||
| Source: | Aquaculture Research, Volume 44, Number 1 (December 2012) | ||||||||||||||||
| Page Numbers: | 140 – 150 | ||||||||||||||||
| Available Full Text: |
|
||||||||||||||||
| Abstract: | We conducted a study to evaluate the effects of holding water temperature on the fecundity and egg quality of photo-manipulated Atlantic cod broodstock. Adult cod Gadus morhuawere distributed among several 25-m3tanks. Three separate photoperiods were used for each group to obtain three spawning per year (in May, July and December). While photoperiod was controlled, the temperature was not controlled and followed the ambient seasonal pattern. Due to the uncontrolled seasonal temperature used, each spawning group experienced different temperatures at a particular gonadal developmental stage. Otherwise, all groups were treated the same. Results showed that the May and July spawning groups released significantly more eggs per kg of fish (four and three times more respectively) than the December spawning group. The egg fertilization success and proportion of normal eggs were also higher in the May and July groups. Possible reason for the difference may be that the May and July groups experienced lower temperatures (4–7°C) during oocyte maturation and ovulation than the December group (7–9°C). Our results show the importance of using lower/natural temperatures during oocyte maturation and ovulation to obtain good quality eggs in photo-manipulated cod broodstock. | ||||||||||||||||
| Citation: | Øyvind J Hansen, Velmurugu Puvanendran, Atle Mortensen . Importance of broodstock holding temperature on fecundity and egg quality in three groups of photo-manipulated Atlantic cod broodstock. Aquaculture Research, Volume 44, Number 1 (December 2012), pp. 140-150, <http://ejournals.ebsco.com/direct.asp?ArticleID=4B80AD03A36C87CA307F> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=4B80AD03A36C87CA307F | ||||||||||||||||
Characterisation of myocardial lesions associated with cardiomyopathy syndrome in Atlantic salmon (Salmo salar) using laser capture microdissection.
When I first started working in the Fish Health Laboratory in Tasmania as a veterinary fish pathologist back in 2002, I was contemplating doing an Honours project on the reason for different morphometric aspects of salmon hearts that we saw coming through the labs. Could it be due to genetics? Does it have any impact on their health, growth or disease susceptibility/resistance? We did not see inflammatory infiltrates such as these, but it’s an interesting article nonetheless.
| Journal of Fish Diseases | |||||||||||||||||
| Volume 35, Number 12 (December 2012) | |||||||||||||||||
| |
Characterization of myocardial lesions associated with cardiomyopathy syndrome in Atlantic salmon, Salmo salar L., using laser capture microdissection | ||||||||||||||||
| Authors: | J Wiik-Nielsen, M Løvoll, C Fritsvold, A B Kristoffersen, Ø Haugland, I Hordvik, M Aamelfot, E Jirillo, E O Koppang, S Grove | ||||||||||||||||
| Author Affiliations: |
|
||||||||||||||||
| Source: | Journal of Fish Diseases, Volume 35, Number 12 (December 2012) | ||||||||||||||||
| Page Numbers: | 907 – 916 | ||||||||||||||||
| Available Full Text: |
|
||||||||||||||||
| Abstract: | Cardiomyopathy syndrome (CMS) in Atlantic salmon, Salmo salar L., is characterized by focal infiltration in the spongy myocardium and endocardium of the heart. The origin of the mononuclear infiltrate is unknown. Using experimentally infected fish, we investigated localization of the causative agent, piscine myocarditis virus (PMCV), within the heart and characterized the cell population associated with myocardial lesions. Cellular and transcriptional characteristics in the lesions were compared with adjacent non-infiltrated tissues using laser capture microdissection, RT-qPCRand immunohistochemistry. Our results reveal that PMCV is almost exclusively present in myocardial lesions. The inflammatory infiltrate comprises a variety of leucocyte populations, including Tcells, Bcells, MHCclass II+and CD83+cells, most likely of the macrophage line. Correlation analyses demonstrated co-ordinated leucocyte activity at the site of the virus infection. Cellular proliferation and/or DNA repair was demonstrated within the myocardial lesions. Different cell populations, mainly myocytes, stained positive for proliferating cell nuclear antigen (PCNA). Densities of endothelial cells and fibroblasts were not significantly increased. The simultaneous presence of PMCV and various inflammatory cells in all myocardial lesions analysed may indicate that both viral lytic and immunopathological effects may contribute to the pathogenesis of CMS. | ||||||||||||||||
| Citation: | J Wiik-Nielsen, M Løvoll, C Fritsvold, A B Kristoffersen, Ø Haugland, I Hordvik, M Aamelfot, E Jirillo, E O Koppang, S Grove . Characterization of myocardial lesions associated with cardiomyopathy syndrome in Atlantic salmon, Salmo salar L., using laser capture microdissection. Journal of Fish Diseases, Volume 35, Number 12 (December 2012), pp. 907-916, <http://ejournals.ebsco.com/direct.asp?ArticleID=48CA861BCFE8B90E8833> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=48CA861BCFE8B90E8833 | ||||||||||||||||
The 44th IAAAM Conference is scheduled for April 21-26, 2013 in Sausalito, CA, USA.
From: IAAAM <stephanie.venn-watson@nmmf.org>
Date: Sat, Dec 15, 2012 at 4:13 AM
Subject: Upcoming IAAAM due dates
To: Richmond <thefishvet@gmail.com>
|
|||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||
—
Follow me on: Facebook “Fin Page” – YouTube – Blog – Linkedin – Twitter
Dr Richmond Loh
http://www.thefishvet.com.au
Ph: +61 (0)421 822 383
Check out the book review of Fish Vetting Medicines in the JAVMA.
Fish Vetting Medicines – Formulary of Fish Treatments has been reviewed by Dr Nick Saint-Erne in the Journal of the American Veterinary Medical Association (JAVMA). See the last page of attached pdf document by clicking on the link below:
What do you look for when examining wet preparations of gill biopsies?
How can you tell if a fish is sick? Sometimes fish are diseased and show no clinical signs…. yet. And before you know it, many fish start dying. This is why checking their gill health even when they are well is so important. So, what is it that I look for when I beam down on the gills? I’ll tell you how in this free video clip I’ve made and uploaded to my youtube channel and you can access it by clicking on this link.
You can tuned for more updates on multiple social media platforms including Facebook “Fin Page” – YouTube – Blog – Linkedin – Twitter
—
Yours sincerely,
Dr Richmond Loh
BSc, BVMS, MPhil (Vet Path), MANZCVS (Aquatics), MANZCVS (Pathobiology), DipPM.
Veterinarian | Adjunct Senior Lecturer Murdoch University | WAVMA Communications Committee Member |
Secretary Aquatic Animal Health Chapter – Australian and New Zealand College of Veterinary Scientists (ANZCVS)
The Fish Vet, Perth, Western Australia, AUSTRALIA. Mobile Veterinary Service for fish and other aquatic creatures.
http://www.thefishvet.com.au
Ph: +61 (0)421 822 383
www.facebook.com/thefishvetdrloh
Dr Loh has added a heap of new photos on his Facebook fan page (http://www.facebook.com/thefishvetdrloh/photos_stream). Be sure to LIKE it to get more regular updates on that platform.
Results from a diet trial for the common octopus (Octopus vulgaris) – should we be culturing them?
This critter seems very expensive to grow and you almost have to feed it a diet entirely of squid or fish to make some octopus. This high protein dietary requirement, plus their ingenuity in not staying put might mean putting this species in the large, growing pile of non-culturable species. I believe we should be directing the limited resources for aquaculture/fisheries research into known culturable species, into replenishing wild stocks and into looking after our environment which is the real resource.
See a previous post – https://thefishvet.com/2012/02/21/fish-are-fed-fish-to-grow-fish-should-we-be-farming-carnivores-or-vegetarians/
See the article below:
| Aquaculture | |||||||||||||||||
| Volume 369, Number 1-2 (November 2012) | |||||||||||||||||
| Growth and digestibility of formulated diets based on dry and freeze-dried ingredients in the common octopus (Octopus vulgaris) | |||||||||||||||||
| Authors: | P.S. Morillo-Velarde, J. Cerezo Valverde, M.D. Hernández, F. Aguado-Giménez, B. García García | ||||||||||||||||
| Author Affiliations: |
|
||||||||||||||||
| Source: | Aquaculture, Volume 369, Number 1-2 (November 2012) | ||||||||||||||||
| Page Numbers: | 139 – 144 | ||||||||||||||||
| Available Full Text: |
|
||||||||||||||||
| Abstract: | We studied the growth of O. vulgaris and the digestibility of two semi-moist diets (50% water) based exclusively on dry and freeze-dried ingredients (Diet S: 20% gelatin, 10% egg yolk powder, 5% Sardinella aurita and 15% Todarodes sagittatus; and Diet P: the same as the previous diet but substituting T. sagittatus by pea). Both diets had a similar macronutrient composition (70–73% protein DW, 12–13% lipids DW), a firm texture when introduced into the water and good acceptability. Survival was 100% with both diets. The specific feeding rates were also similar for both diets (1.0% body weight/day; P0.05), although the best results were obtained with diet S, which was responsible for an absolute growth rate of 9.6g/day and a feed conversion rate of 1.0, compared with the 2.2g/day and 3.9 obtained with diet P; P<0.05). The protein and lipid productive values were significantly higher for diet S than for diet P (43.6 and 13.3% vs. 20.2 and -0.5%, respectively). The good results obtained with diet S may be explained by its greater digestibility (93.3% for dry matter, 97.0% for proteins and 87.9% for lipids) compared with the corresponding value for diet P (73.8%, 92.1% and 85.0%, respectively). The findings demonstrate that O. vulgaris can be fed with dry or freeze-dried ingredients that have undergone mild heat treatments since they lead to good growth, feed efficiency and digestibility. Future studies on octopus on-growing could use a similar base to that proposed in this paper to obtain diets with better acceptability, stability or nutritional composition for commercial purposes. | ||||||||||||||||
| Citation: | P.S. Morillo-Velarde, J. Cerezo Valverde, M.D. Hernández, F. Aguado-Giménez, B. García García . Growth and digestibility of formulated diets based on dry and freeze-dried ingredients in the common octopus (Octopus vulgaris). Aquaculture, Volume 369, Numbers 1-2 (November 2012), pp. 139-144, <http://ejournals.ebsco.com/direct.asp?ArticleID=4FA5AD831B216E8D179E> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=4FA5AD831B216E8D179E | ||||||||||||||||
Free online info for ornamental fish owners has been unveiled.
Check out – http://www.aquariumindustries.com.au/fish-school/
And for those who want more advanced knowledge and some of the fish veterinary secrets, check out "Fish Vetting Essentials" manual at https://thefishvet.com/
Cool video of a rare transversotrematid worm from the skin of a Frontosa.
Check out this cool critter I uploaded to my youtube channel –
You need to watch it with sound. I had a bit of a chuckle when the client described it as resembling his wife! Not quite the late Steve Irwin, the Crocodile Hunter, but it could be his twin!
Can you identify this bug in the wet preparation? It’s apparently a transversotrematid, possibly Prototransversotrema steeri. It’s one of the few digeneans (they have an indirect life cycle via an intermediate snail host) that are ectoparasitic, living in the scale pockets (and for this reason, they are wider than they are long). Because they’re not exposed to the water, bath treatments won’t work. Oral praziquantel might be more efficacious, although it is unlikely to spread in an aquarium without the snail host. It’s not a common freshwater fish critter and this is why it has taken me over 10 years for my first encounter. There’s a species called T. haasi that has an especially broad host range among the Indo-Pacific reef fishes.
The two black spots are its eyes and between them is its pharynx/mouth. The loop with fluid moving through it is the gut, and it’s called a cyclocoel.
The information provided above has been the combined responses of Drs Marty Deveney and Al Dove. Thanks guys!
—
Follow me on: Facebook "Fin Page" – YouTube – Blog – Linkedin – Twitter —
Yours sincerely,
Dr Richmond Loh
BSc, BVMS, MPhil (Vet Path), MANZCVS (Aquatics), MANZCVS (Pathobiology), DipPM.
Veterinarian | Adjunct Senior Lecturer Murdoch University | WAVMA Communications Committee Member |
Secretary Aquatic Animal Health Chapter – Australian and New Zealand College of Veterinary Scientists (ANZCVS)
The Fish Vet, Perth, Western Australia, AUSTRALIA. Mobile Veterinary Service for fish and other aquatic creatures.
http://www.thefishvet.com.au
Ph: +61 (0)421 822 383

