Cannibalism in cultured juvenile lobster Panulirus ornatus and contributing biological factors

Kelly, Tara R.; Giosio, Dean R.; Trotter, Andrew J.; Smith, Gregory G.; Fitzgibbon, Quinn P.

doi:10.1016/j.aquaculture.2023.739883

Cited by 3 publications

(3 citation statements)

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“…Four reference values were required to relatively adjust, align, and compare the known curve of the test light source, the readings of the test light source from the AS7265x, the gain correction curve, and the gain-corrected readings of the test light source from the AS7265x. The four reference points were as follows: (1) The test light source data were made relative to the value at 940 nm as this was the highest value in the relevant wavelength domain.…”

Section: Near-infrared Spectroscopy Light Sourcementioning

confidence: 99%

“…The four tubes were mounted in the housing to focus the individual light beams to a point 75 mm directly in front of the camera lens and AS7265x spectral sensors (Figure 1). A manual action button was used to trigger the following capture sequence: (1)…”

Section: Low-cost Spectral Cameramentioning

confidence: 99%

“…Tropical rock lobsters (Panulirus ornatus) have significant aquaculture potential; however, as a juvenile animal, they are highly cannibalistic, which provides a challenge for the large-scale propagation of this species. Cannibalism events predominantly occur for P. ornatus during the process of ecdysis (moulting), where the moulting animals are cannibalised by intermoult animals [1]. An element missing from current strategies is the ability to automatically identify pre-ecdysis juvenile lobsters, which is currently limited to manual inspection.…”

Section: Introductionmentioning

confidence: 99%

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Sensing Pre- and Post-Ecdysis of Tropical Rock Lobsters, Panulirus ornatus, Using a Low-Cost Novel Spectral Camera

Sutherland,

Henderson,

Giosio

et al. 2024

JMSE

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Tropical rock lobsters (Panulirus ornatus) are a highly cannibalistic species with intermoult animals predominantly attacking animals during ecdysis (moulting). Rapid, positive characterisation of pre-ecdysis lobsters may open a pathway to disrupt cannibalism. Ecdysial suture line development is considered for pre-ecdysis recognition with suture line definition compared for intermoult and pre-ecdysis lobsters emerged and immerged, using white, near ultraviolet (365 nm), near infrared (850 nm), and specialty SFH 4737 broadband IR LEDs against a reference of intermoult lobsters with no suture line development. Difficulties in acquiring suture line images prompted research into pre-ecdysis characterisation from the lobster’s dorsal carapace, due to its accessibility through a culture vessel’s surface. In this study, a novel low-cost spectral camera was developed by coordinating an IMX219 image sensor, an AS7265x spectral sensor, and four SFH 4737 broadband infrared LEDs through a single-board computer. Images and spectral data from the lobster’s dorsal carapace were acquired from intermoult, pre-ecdysis, and post-ecdysis lobsters. For the first time, suture line definition was found to be enhanced under 850 nm, 365 nm, and SFH 4737 LEDs for immerged lobsters, while the 850 nm LED achieved the best suture line definition of emerged lobsters. Although the spectral camera was unable to characterise pre-ecdysis, its development was validated when a least squares regression for binary classification decision boundary successfully separated 86.7% of post-ecdysis lobsters. Achieving post-ecdysis characterisation is the first time the dorsal carapace surface has been used to characterise a moult stage for palinurid lobsters.

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Section: Near-infrared Spectroscopy Light Sourcementioning

confidence: 99%

Section: Low-cost Spectral Cameramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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