Cute video:
http://m.youtube.com/#/watch?desktop_uri=%2Fwatch%3Fv%3DxPxDw7ajfGE&v=xPxDw7ajfGE&gl=AU
Sentinel testing of koi.
Following on from my previous post regarding “sentinel testing” (https://thefishvet.wordpress.com/2012/07/24/sentinels-in-quarantine/), Singapore has been using it for quite a while.
The excerpt below is taken from Ling & Poh, Quarantine, Surveillance, and Monitoring of Koi Herpesvirus in Singapore. The Israeli Journal of Aquaculture – Bamidgeh 61(3), 2009.
For high value koi, taking samples would be cost prohibitive to the traders. In such cases, the consignment is cohabited with sentinel KHV-free koi for one week, after which the latter are tested for KHV. The high value consignment continues its quarantine for three
weeks. If the sentinel koi test negative for KHV, the consignment is released, but if the sentinel koi test positive, the consignment is destroyed. Strict controls are imposed to ensure that koi exports from Singapore are also free from KHV. These include a compulsory quarantine period of a minimum three weeks prior to the issuance of a KHV-free certificate.
Fish Joke for Monday-itis
This joke took me a while to understand, but it’s quite clever…
What’s funnier than seeing a cat,fish?
Seeing a fish,bowl.
Shared by Toni Erkinharju.
What does a whale sharks brain look like & why should we care?
Which is the best waterproof tough camera?
After having drowned two Olympus tough cameras (at only 4m depth, both times!), I’m now on my third which is a Panasonic Lumix. But it had a small piece break off whilst I was in the US. I’m starting to think that these things aren’t living up to their name.
One of my friends shared with me a magazine, “Tech living.” It has a section in it that reviews the popular makes of such cameras, namely Olympus, Fuji, Nikon and Panasonic. Of these, it sounds like Nikon comes out the winner.
See the review pictured below:
Fish anaesthetic for catch and release.
Are you doing research in the field where you have to catch and release fish? What can you use to sedate the fish and still be able to release it immediately, avoiding any witholding periods?
The USDA has just authorised the use of Aqui-S for such work. Read more by clicking on this link.
This same drug is registered in Australia for use in salmonids, lobsters and abalone with nil withholding period (i.e. the fish can be humanely euthanised with this product and the flesh is safe for human consumption immediately).
Reviewed a paper for Journal of Fish Diseases
I was contacted by the Guru of Fish Pathology (Prof. Ron Roberts is the veterinarian who published "Fish Pathology" which is considered the "bible" on fish diseases) last week to review a scientific paper for the Journal of Fish Diseases. I used to think that writing a paper was difficult, but editing it is not that easy either! I just finished reviewing and lodged it online and I received this thank you message:
Thank you for reviewing manuscript # JFD-2012-*** "*.*" for the Journal of Fish Diseases.
On behalf of the Editors of the Journal of Fish Diseases, we appreciate the voluntary contribution that each reviewer gives to the Journal. We thank you for your participation in the online review process and hope that we may call upon you again to review future manuscripts.
Sincerely,
Prof. Ron Roberts
Editor, Journal of Fish Diseases
heronpisces
—
Follow me on: Facebook "Fin Page" – Linkedin – YouTube – Twitter – Blog —
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. Mobile Veterinary Service for fish and other aquatic creatures.
http://www.thefishvet.com.au
Ph: +61 (0)421 822 383
What is good water quality for fish?
What’s good water quality for one species is not necessarily good water quality for another. And when some people say they have good water quality, they mean that their water looks good and they have only tested their pH.
Check out the optimal water quality parameters for the different fish species in the picture below (excerpt from Fish Vetting Essentials):
What’s the best temperature for artificially spawning Japanese eels?
| Aquaculture | |||||||||||||||||
| Volume 359, Number 5 (August 2012) | |||||||||||||||||
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Optimum temperature of rearing water during artificial induction of ovulation in Japanese eel | ||||||||||||||||
| Authors: | Tatsuya Unuma, Sayumi Sawaguchi, Natsuki Hasegawa, Noriko Tsuda, Toshiomi Tanaka, Kazuharu Nomura, Hideki Tanaka | ||||||||||||||||
| Author Affiliations: |
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| Source: | Aquaculture, Volume 359, Number 5 (August 2012) | ||||||||||||||||
| Page Numbers: | 216 – 223 | ||||||||||||||||
| Available Full Text: |
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| Abstract: | To obtain fertilized eggs of the Japanese eel Anguilla japonica, mature females are injected with maturation-inducing steroid (MIS) to induce final oocyte maturation and ovulation and then paired with mature males for spawning (induced spawning method) or stripped to collect eggs for insemination (stripping and insemination method). Progress of final oocyte maturation and ovulation and consequent egg quality are affected by the environmental water temperature. To detect the optimum temperature of the rearing water during artificial induction of ovulation by MIS injection, we investigated the effects of water temperature on ovulation, egg quality, and its deterioration due to over-ripening using the stripping and insemination method. Mature females injected with 17a-hydroxyprogesterone were stocked in tanks maintained at 17.5°C, 20°C, 22.5°C or 25°C. Earlier ovulation occurred at the higher water temperatures. Viability of the eggs that were collected from females immediately after observation of ovulation was similar at 20°C and 22.5°C but inferior at 17.5°C and 25°C. After eggs are retained in the body cavity for an hour, their viability was increasingly reduced due to over-ripening at the higher temperatures between 20°C and 25°C. Moreover, hatchability of unfertilized eggs placed in tubes and maintained at 15°C, 17.5°C, 20°C, 22.5°C or 25°C for 3h showed a time-dependent decrease due to over-ripening, which progressed slower at the lower temperature band between 20°C and 25°C. However, 15°C and 17.5°C did not delay the progress of over-ripening compared to 20°C. We conclude that 17.5°C and 25°C are not appropriate for ovulation induction, because egg quality just after ovulation is lower than at 20°C and 22.5°C. In the stripping and insemination method, 22.5°C is disadvantageous compared to 20°C because of the faster progress of over-ripening, though this does not matter in the induced spawning method as spawning behavior and consequent fertilization are expected to occur at an appropriate timing after ovulation. | ||||||||||||||||
| Citation: | Tatsuya Unuma, Sayumi Sawaguchi, Natsuki Hasegawa, Noriko Tsuda, Toshiomi Tanaka, Kazuharu Nomura, Hideki Tanaka . Optimum temperature of rearing water during artificial induction of ovulation in Japanese eel. Aquaculture, Volume 359, Number 5 (August 2012), pp. 216-223, <http://ejournals.ebsco.com/direct.asp?ArticleID=4FB6826A3BC2F93BDD89> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=4FB6826A3BC2F93BDD89 | ||||||||||||||||
Frozen fish for learning.
I’ll be doing a spot of training for the final year veterinary students during their elective, Wildlife Conservation & Zoo Medicine, in a couple of weeks.
After attending the recent Aquavet course (with many thanks to FRDC’s people development program), I’ve been inspired with new ideas on how to teach more effectively.
For these series of practical sessions, I’ll be using freshly thawed frozen fishes (pictured) to coach the students on non-lethal diagnostic techniques, learn the external and internal anatomy of fish, administer medication and performing a full necropsy. No fish practical is complete without discussing water quality. So, I’ll be preparing water samples spiked with ammonium chloride and sodium nitrite to simulate the conditions in ‘new tank syndrome’. These chemicals are also ideal for fish-less biofilter cycling.
