ประเมินผลของขนาดแม่กุ้งและการเปลี่ยนแปลงคุณภาพน้ำต่ออัตราการเขี่ยไข่ทิ้ง ของแม่กุ้งมังกรเจ็ดสี (Panulirus ornatus) และอิทธิพลของแสงและช่วงเวลาการให้อาหาร ต่อลูกกุ้งระยะ Phyllosoma

Rungtiwa Konsantad; Wasana  Arkronrat

doi:10.14456/jare-mju.2026.16

Authors

Rungtiwa Konsantad Klongwan Fisheries Research Station, Faculty of Fisheries, Kasetsart University, Prachuap Khiri Khan, Thailand https://orcid.org/0009-0005-2112-0954
Wasana Arkronrat Klongwan Fisheries Research Station, Faculty of Fisheries, Kasetsart University, Prachuap Khiri Khan, Thailand

DOI:

https://doi.org/10.14456/jare-mju.2026.16

Keywords:

egg abandonment, lobster breeding, ovigerous female lobster, phyllosoma nursing

Abstract

The cultivation of ornate spiny lobster (Panulirus ornatus) faced several challenges, including egg abandonment (EA) by females in hatcheries and unexplained mortality of early-stage larvae, which affect hatchery efficiency. This study aimed to evaluate the effects of female size and water quality changes during rearing that could influence EA behavior in the hatchery, and to examine the influence of light and feeding timing on primary phyllosoma larvae. The experiment was divided into two parts: (1) an initial study to identify trends in the effects of size (carapace length, CL and body weight, BW) and water quality on the daily EA rate of female broodstock (n=5), and (2) a factorial design (2×4 factors) to assess the joint influence of light (two lighting conditions) and live-food feeding intervals (four time periods) on feeding rate and mortality of primary phyllosoma (n=3). Results showed that EA rates varied among females kept at mean salinity of 30.67±1.15 ppt, with CL of 124–148 mm and BW of 1,967–2,740 g (P<0.05). The mean daily EA ranged from 1.89±0.25 to 8.25±4.38 g/day, and brood-size did not correlate with EA rate. Total ammonia changes during rearing were positively associated with EA rate (r=0.90, P=0.032), whereas changes in water quality in terms of physical (temperature) and chemical (dissolved oxygen concentration, pH, nitrite concentration, and alkalinity) properties showed no significant associations. In addition, we found that feeding period affected the eating habits of phyllosoma larva, whereby feeding from 12:00–06.00 p.m. resulted in greater consumption (P<0.05). On the other hand, light condition had no effect on feeding habit and mortality rates of phyllosoma for rearing under natural light and dark conditions (P>0.05). This study indicates that maintaining ammonia levels in water to prevent impacts on EA and aligning feeding times with the phyllosoma’s optimal feeding period can enhance breeding and rearing efficiency of this lobster.

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