EarthWays wrote:I assume it would it be ok if we find evidence that there is no danger that they will get naturalised? Example: if the winters are to cold for it to survive?
I think that "can o worms" (
) is way over my knowledge level. Although ideal temp is around 27C (at 60-70% RH) for breeding, the larvae survive for months at certain temps "Phoenix Worms will have the longest shelf life at 50-60° F"(10C)
If they got into a commercial poultry farm, commercial greenhouse, or other unforeseen mild niche, they could survive and it could have knock on effects. Not necessarily bad effects on face value, out competing the house fly sounds good for e.g. but what else could they be pushing out of it's environment?
I've not found a study that indicates mortality at specific temps yet.
This is an interesting paper (for breeding temps etc.) Selected Life-History Traits of Black Soldier Flies (Diptera: Stratiomyidae) Reared on Three Artificial Diets (pdf)
This paper: Factors influencing mating and oviposition of black soldier flies (Diptera: Stratiomyidae) in a colony (pdf)
states "However the lower temperature limit for Black Soldier fly activity are not known, only that a colony can be maintained at 22C (it quotes unpublished data)
Still looking though, I'll edit in any links to papers on this post below:
This paper: USING THE BLACK SOLDIER FLY, Hermetia illucens, AS A VALUE-ADDED TOOL FOR THE MANAGEMENT OF SWINE MANURE (pdf)
has a handy breakdown of nutritional values, assesses the quality of larvae as fish food, and has a table of nutrients in it's assessment of "POTENTIAL VALUE OF RESIDUE AS A SOIL AMENDMENT"
One possible bad effect of introducing them could be as a host for parasitic wasps according to this paper: Parasitism of the Black Soldier Fly by Trichopria sp. (Hymenoptera: Diapriidae) in Poultry Houses
who knows what knock on effects increasing parasitic wasps might have on say butterflies?Abstract
(main paper paywalled) "To demonstrate how globalisation and climate changes are breaking the geographic barriers, we present some cases in which, during our entomoforensic investigations, performed mainly in North-eastern Italy, Neotropical, African and Asiatic necrophagous flies, beetles and wasp parasitoids have been collected, some of which rare or new for Italy or Paleartic Region. In particular, we report our studies on the american black soldier fly
, Hermetia illucens (Diptera: Stratiomyidae), that is showing a heavy competition with the local saprophagous species
and is reaching great importance in some man activities and in cattle health.Biofuel from BSF larvae!
"BSFL was grown on organic wastes for 10 days and used for crude fat extraction by petroleum ether. The extracted crude fat was then converted into biodiesel... resulting in 35.5 g, 57.8 g and 91.4 g of biodiesel being produced from 1000 BSFL growing on 1 kg of cattle manure, pig manure and chicken manure, respectively."
Abstract on European distribution (2003): Known data on the distribution of Hermetia illucens (L.) in Europe are summarized and updated. This species has been reliably recorded from Portugal, Spain, France, Switzerland, Italy, Malta, Croatia and Albania. A new record from Turkey represents the easternmost finding in the West Palaearctic and a new species to the fauna of the whole of the Near East. It may be evidence of a recent extension of this species in the Mediterranean area.
Presumably with such a wide European distribution already, it can't be doing any harm or it would have come up in the search? I'm at a bit of a dead end, wonder if it's worth contacting The British Entomological and Natural History Society, it'd be good to hear from a Dipterist on other possible native species.