Top 3 Biorxiv Papers Today in Zoology


2.003 Mikeys
#1. Chemical degumming increases larvae size and facilitates commercial production of Lumpfish (Cyclopterus lumpus) eggs
Craig Lennox Pooley, Mia G Berwick, Carlos Garcia de Leaniz
Many fishes produce adhesive eggs that confer protection from currents and predators in the wild, but that are more difficult to disinfect and aerate under aquaculture conditions. Removing egg adhesiveness (degumming) has proved beneficial in the culture of many fish, and a recent gap analysis identified this as a potential way of increasing hatching success and minimize the risk of infectious diseases in the culture of lumpfish (Cyclopteurs lumpus), a novel species to aquaculture. We tested the efficacy of the enzyme alcalase (0.02%, 0.2%, 2%) as a degumming agent for lumpfish eggs, and examined its effects on hatching success, survival, and larvae size under laboratory and commercial conditions. A five-minute exposure to 0.2% and 2% alcalase decreased chorion thickness by 14% and resulted in 61-75% degumming rates, without any negative effects on hatching rate, larval survival, or incidence of embryo malformations. Degummed eggs hatched earlier than controls and resulted in larger larvae, which may confer some benefits under...
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biorxivpreprint: Chemical degumming increases larvae size and facilitates commercial production of Lumpfish (Cyclopterus lumpus) eggs https://t.co/qAHOFS7nYE #bioRxiv
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Sample Sizes : [18, 6, 18]
Authors: 3
Total Words: 6790
Unqiue Words: 2619

2.003 Mikeys
#2. Population productivity of shovelnose rays: inferring the potential for recovery
Brooke M. D'Alberto, John K. Carlson, Sebastian A. Pardo, Colin A. Simpfendorfer
Recent evidence of widespread and rapid declines of shovelnose ray populations (Order Rhinopristiformes), driven by a high demand for their fins in Asian markets and the quality of their flesh, raises concern about their risk of over-exploitation and extinction. Using life history theory and incorporating uncertainty into a modified Euler-Lotka model, maximum intrinsic rates of population increase (rmax) were estimated for nine species from the four families of rhinopristiforms. Estimates of median rmax varied from -0.04 to 0.60 year-1 among the nine species, but generally increased with increasing maximum size. In comparison to 115 other species of chondrichthyans for which rmax values were available, the families Rhinidae and Glaucostegidae are relatively productive, while most species from Rhinobatidae and Trygonorrhinidae had relatively low rmax values. If the demand for their high value products can be addressed, then population recovery for this species is likely possible but will vary depending on the species.
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biorxivpreprint: Population productivity of shovelnose rays: inferring the potential for recovery https://t.co/7zC1gWt1nL #bioRxiv
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Sample Sizes : None.
Authors: 4
Total Words: 13665
Unqiue Words: 4252

1.998 Mikeys
#3. Cabbage stem flea beetle’s (Psylliodes chrysocephala L.) susceptibility to pyrethroids and tolerance to thiacloprid in the Czech Republic
Jitka Stara, František Kocourek
The cabbage stem flea beetle (CSFB), Psylliodes chrysocephala (Coleoptera: Chrysomelidae), has recently become a major pest species in winter oilseed rape in the Czech Republic. The susceptibility of CSFB populations from two localities to six pyrethroids, two neonicotinoids, one organophosphate and one oxadiazine was evaluated in 2015-2018 in glass vial experiments. The susceptibility of CSFB to thiacloprid and thiamethoxam was evaluated in feeding experiment in 2017 and 2018. High susceptibility of CSFB populations to lambda-cyhalothrin, cypermethrin, esfenvalerate, tau-fluvalinate, etofenprox, deltamethrin, chlorpyrifos, indoxacarb and acetamiprid was observed in the glass vial experiments. The LC50 and LC90 data obtained for pyrethroids in these experiments in 2015 represent baseline for CSFB resistance monitoring to pyrethroids in the Czech Republic. High tolerance of CSFB to thiacloprid of CSFB was demonstrated in glass vial and the feeding experiment, too.
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Sample Sizes : None.
Authors: 2
Total Words: 7773
Unqiue Words: 2303

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