The Fish Vet's Blog

What do you call a very cute baby fish?

 

 

 

 

 

A cuddle-fish!

An old but interesting article on fish vets.

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Other interesting points in this paper as well.

 

Aquaculture
Volume 357, Number 3 (August 2012)
	The effects of tank colour, live food enrichment and greenwater on the early onset of jaw malformation in striped trumpeter larvae
	Authors:	Jennifer M. Cobcroft, Alexander Chong Shu-Chien, Meng-Kiat Kuah, Annette Jaya-Ram, Stephen C. Battaglene
	Author Affiliations:	no affiliations available
	Source:	Aquaculture, Volume 357, Number 3 (August 2012)
	Page Numbers:	61 – 72
	Available Full Text:	Full Text: Subscription Required to view full text Format: PDF Size: Unknown Location: Publisher’s Site Authentication: Publisher’s Site
	Abstract:	A high incidence of jaw malformation has hindered the production of quality striped trumpeter Latris lineatajuveniles and has been correlated with walling behaviour in Artemia-fed larvae. In this study, striped trumpeter were reared from first feeding to 29days post-hatching (dph) in different coloured tanks (black or white), culture conditions (clear or greenwater) and fed different diets (enriched or non-enriched rotifers and Artemia), to examine behaviour, retinoid receptor gene expression and jaw malformation. The highest incidence and severity of jaw malformations occurred in clearwater and enriched diet treatments and were significantly more common in white (70±15%, mean±SD) than in black tanks (26±15%). In black tanks, jaw malformation was significantly more common in larvae fed enriched diets (18±14%) than in those fed non-enriched diets (8±8%) and in clearwater (19±14%) versus greenwater (7±6%). At the end of the rotifer feeding phase, larvae were significantly larger in black than white tanks, and longer in greenwater than in clearwater. In the Artemiafeeding phase, larval growth was slowest and mortality was highest in non-enriched diet treatments. Larval length and survival were higher in black tanks and in enriched diet treatments, whilst survival was almost twice as high in greenwater (46±18%) than clearwater (26±13%). The average proportion of larvae walling over the duration of the experiment was higher in white than black tanks, and higher in enriched than non-enriched treatments, with lowest walling in greenwater. There was no consistent relationship between feed intake and jaw malformation. However, there was a significant positive correlation between walling and the incidence of jaw malformation at 29dph in larvae fed enriched diets. The expression pattern of three retinoid receptor genes indicated that live feed enrichment and stress could potentially perturb retinoic acid-associated pathways leading to skeletal abnormality. We found that the use of greenwater, black tanks and enriched live feeds is required for good growth, development, survival and final yield of striped trumpeter. The study emphasises the importance of reducing walling in the culture of oceanic larvae and may have direct application in the rearing of other marine fish with similar malformations.
	Citation:	Jennifer M. Cobcroft, Alexander Chong Shu-Chien, Meng-Kiat Kuah, Annette Jaya-Ram, Stephen C. Battaglene . The effects of tank colour, live food enrichment and greenwater on the early onset of jaw malformation in striped trumpeter larvae. Aquaculture, Volume 357, Number 3 (August 2012), pp. 61-72, <http://ejournals.ebsco.com/direct.asp?ArticleID=488DB95F5DDD57A7C293&gt;
	URL:	http://ejournals.ebsco.com/direct.asp?ArticleID=488DB95F5DDD57A7C293

I’m far from an expert fisherman, but I thought I’d share with you a few pointers from a fishing magazine that I picked up when I was in Mammoth, California – 2012 Eastern Sierra Fishing & Vacation Guide. I’ve also added a few more to it.

Barbless hooks allow for ease of removal.

Wide gape hooks prevents hooks from become lodged too deeply.

Use hook removers, pliers or haemostats to remove hooks without causing too much damage.

Tungsten sinkers are lead-free, are more dense and have a smaller profile allows them to sink faster too.

Consider Biodegradable fishing lines and lures.

Fish Tailer Landing Glove is designed to protect the outer slime layer of fish.

Knot-less landing nets protect the slime, skin and scales of fish.

A length of heavy PVC pipe to use for stunning fish you intend to keep.

Alternatively, consider the use of fish anaesthetic such as Aqui-S. In Australia, there is nil withholding period and is registered for use in salmonids, abalone and lobster.

Clean and disinfect clothes and equipment when going from one fishing spot to another.

This is exactly what Australia needs and it’s in it’s 18th year in the US!

18th Annual USFWS Aquaculture Drug Approval Coordination Workshop

Radisson Hotel, La Crosse, Wis.
July 31, 2012

 

More information:

http://www.uwlax.edu/conted/fish/homeaquaagenda.htm