How low can they go: A comparison between dog (Canis familiaris) and environmental DNA detection of invasive koi carp (Cyprinus rubrofuscus)

Collins, Melissa A.; Browne, Clare M.; Edwards, Timothy L.; Ling, Nicholas; Tempero, Grant Wayne; Gleeson, Dianne; Crockett, Kimberly; Quaife, Jesse Austin

doi:10.1016/j.applanim.2022.105729

Cited by 4 publications

(2 citation statements)

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“…Concha et al tested dogs' olfactory threshold with amyl acetate using an eight-choice carousel [35], whereas DeChant et al selected isoamyl acetate as a target for a three-alternative forced-choice test in a scent line-up device [36]. Other studies conducted in applied animal science and forensic science have used scent line-ups or carousels when investigating dogs' olfactory threshold to other targets, e.g., tuatara and gecko scents [37], koi carp [38], or ignitable liquids [8], as well as when studying olfactory properties of dogs and wolves in detecting raw food [39]. Detection thresholds for odors can be determined using different kinds of methods in both humans and dogs [40].…”

Section: Introductionmentioning

confidence: 99%

Scent Detection Threshold of Trained Dogs to Eucalyptus Hydrolat

Turunen,

Paavilainen,

Vepsäläinen

et al. 2024

Animals

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Dogs’ (Canis lupus familiaris) sense of smell is based on a unique anatomy and physiology that enables them to find and differentiate low concentrations of odor molecules. This ability is exploited when dogs are trained as search, rescue, or medical detection dogs. We performed a three-part study to explore the scent detection threshold of 15 dogs to an in-house-made Eucalyptus hydrolat. Here, decreasing concentrations of the hydrolat were tested using a three-alternative forced-choice method until the first incorrect response, which defined the limit of scent detection for each tested dog. Quantitative proton nuclear magnetic resonance spectroscopy was used to identify and measure the contents of ten commercial Eucalyptus hydrolats, which are used in a dog scent training sport called “nose work”. In this study, the dogs’ limit of detection initially ranged from 1:104 to 1:1023 but narrowed down to 1:1017–1:1021 after a training period. The results show that, with training, dogs learn to discriminate decreasing concentrations of a target scent, and that dogs can discriminate Eucalyptus hydrolat at very low concentrations. We also detected different concentrations of eucalyptol and lower alcohols in the hydrolat products and highlight the importance of using an identical source of a scent in training a dog for participation in canine scent sport competitions and in olfactory research.

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Section: Introductionmentioning

confidence: 99%

Scent Detection Threshold of Trained Dogs to Eucalyptus Hydrolat

Turunen,

Paavilainen,

Vepsäläinen

et al. 2024

Animals

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“…The addition of pigmentation ingredients in the feed will encourage an increase in colour pigments in the fish's body and be able to maintain the dyes in the body (Nur et al, 2020). The increase in colour intensity in fish is influenced by two factors, namely internal factors and external factors (Collins et al, 2022). Internal factors are factors originating from within the body of the fish that are fixed, such as age, size, genetics, sex, and the fish's ability to absorb the nutrients in the feed (Indarti et al, 2012) The pigment manipulation technique by enriching the content of pigment cells in the fish's body through feeding containing astaxanthin (chlorophyll pink) is a way to obtain bright and even colours in fish (Sitorus, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

Increased Color Brightness with the Addition of Astaxanthin in Koi Fish (Cyprinus Rubrofuscus) Feed

Suryati Panjaitan

2023

JWS

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Introduction: This research was conducted experimentally from May to July 2021 at the Teaching Factory Cultivation Laboratory (TEFA) of the Jakarta Fisheries Business Specialist Polytechnic. This study aims to determine the effect of astaxanthin feeding on increasing color, survival and growth of koi fish. Method: The research method used is quantitative. The design used was a completely randomized design (CRD) with four treatment levels and three replications. Analysis of variance used was analysis of variance (ANOVA. Results: The results showed that the addition of astaxanthin to feed had a significant effect on changes in the color quality of koi fish. The best result was the addition of astaxanthin 125 mg/kg feed (20.29 ± average weight measurement results) (ABW) at the end of the study obtained the highest value in treatment A (control) of 10.37 g. The results of the average weight measurement (ABW) at the end of the study obtained the highest value in treatment A (control) of 10.37 g, Specific Growth Rate (SGR) was the highest in treatment A (control) of 12.00%, the best Feed Conversion Ratio (FCR) was in the treatment with the addition of 100 mg astaxanthin 1.12. Conclusion: The use of astaxanthin in koi fish feed can increase the selling value of koi fish in the market because of the bright color is one of the important criteria in assessing the quality of koi fish. Koi fish farmers can consider adding astaxanthin and need to pay attention to the right dosage.

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