Fertilization, survival and growth of hybrids between Crassostrea gigas and Crassostrea sikamea

2019 ◽  
Vol 85 (5) ◽  
pp. 821-828 ◽  
Author(s):  
Hongqiang Xu ◽  
Qi Li ◽  
Lingfeng Kong ◽  
Hong Yu ◽  
Shikai Liu
Keyword(s):  
Crassostrea Gigas ◽  
Crassostrea Sikamea ◽  
Survival And Growth

Fertilization, survival and growth of reciprocal crosses between two oysters, Crassostrea gigas and Crassostrea nippona

Aquaculture ◽  
2019 ◽  
Vol 507 ◽  
pp. 91-96 ◽  
Author(s):  
Hongqiang Xu ◽  
Qi Li ◽  
Ziqiang Han ◽  
Shikai Liu ◽  
Hong Yu ◽  
...  
Keyword(s):  
Crassostrea Gigas ◽  
Reciprocal Crosses ◽  
Survival And Growth ◽  
Crassostrea Nippona

Invasive orchitophryid ciliate infections in juvenile Pacific and Kumomoto oysters, Crassostrea gigas and Crassostrea sikamea

Aquaculture ◽  
1999 ◽  
Vol 174 (1-2) ◽  
pp. 1-14 ◽  
Author(s):  
Ralph A Elston ◽  
Dan Cheney ◽  
Paul Frelier ◽  
Denis Lynn
Keyword(s):  
Crassostrea Gigas ◽  
Crassostrea Sikamea

scholarly journals Effects of Light Intensity and Wavelength on the Phototaxis of the Crassostrea gigas (♂) and Crassostrea sikamea (♀) Hybrid Larvae

2021 ◽  
Vol 8 ◽  
Author(s):  
Xuekai Zhang ◽  
Chao Fan ◽  
Xingzhi Zhang ◽  
Qiongzhen Li ◽  
Yangchun Li ◽  
...  
Keyword(s):  
Light Intensity ◽  
Crassostrea Gigas ◽  
Red Light ◽  
Light Sensitivity ◽  
Light Pollution ◽  
Coastal System ◽  
Positive Phototaxis ◽  
Positive Effects ◽  
Coastal Species ◽  
Crassostrea Sikamea

Light sensitivity is important for marine benthic invertebrates, and it plays a vital role in the oysters settling. Generally, the emerging of eyespot is a signal of oyster larvae settling, while like most of the other coastal species, the oysters are threatened by artificial light pollution. Crassostrea gigas and Crassostrea sikamea are two oyster species naturally distributed in China, and their hybrids are potential material for oyster cross-breeding. Therefore, we investigated the phototaxis of hybrid eyespot larvae and eyeless larvae under different light intensities and wavelengths to uncover how light affects their behaviors. The results indicated that hybrid oyster larvae had positive phototaxis to specific light intensity and wavelength. We further concluded that 5 lx was the positive phototaxis light intensity for the eyeless hybrid larvae, and that the acceptable light intensity range of the eyespot hybrid larvae expanded to 5–10 lx, but no higher than 15 lx; besides, the hybrid larvae behaved negatively to the light over 25 lx. The present study also suggested the positive effects of green light on larvae gathering and the induction of red light on eyespot larvae settling. In conclusion, our study may contribute to the understanding of phototaxis of hybrid oyster larvae, as well as the further perspective of light pollution on benthic communities and coastal system restoration.

scholarly journals Perbandingan frekuensi molting Lobster air tawar (Cherax quadricarinatus) yang diberi pakan komersil dan nanokalsium yang berasal dari cangkang tiram (Crassostrea gigas)

DEPIK ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 42-46
Author(s):  
Lia Handayani ◽  
Faisal Syahputra
Keyword(s):  
Growth Rate ◽  
Solid Waste ◽  
Crassostrea Gigas ◽  
Oyster Shell ◽  
Cherax Quadricarinatus ◽  
Calcium Supplements ◽  
Calcium Addition ◽  
Calcium Source ◽  
Survival And Growth ◽  
Effect On Growth

Oyster shell can be used as alternative calcium source. Utilizing of oyster shell into nano calcium flour can be used to decrease solid waste. The usage of nano calcium flour in feed is important applied as calcium supplements with cherax quadricarinatus. The purpose of this research is to study the effect of nano calcium addition on feeds to increase moulting frequency, survival and growth rate of freshwater lobster. This research has been done during 60 days in fisheries Laboratory, Abulyatama University. Two percents nano calcium addition on feeds gives significant effect on growth rate and very significant effect to moulting frequency of freshwater lobster. Which has moulting frequency 2.71. Where the treatment was not added nano calcium has moulted frequency 1.29. But, nano calcium addition on foods did not affect survival rate.Cangkang tiram dapat digunakan sebagai alternatif sumber kalsium. Pemanfaatan cangkang tiram menjadi serbuk nanokalsium dapat mengurangi limbah padat. Penggunaan serbuk nanokalsium pada pakan penting dilakukan sebagai suplemen kalsium untuk lobster air tawar. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan nanokalsium pada pakan terhadap pertumbuhan, frekuensi molting dan kelangsungan hidup Lobster Air Tawar (LAT). Penelitian ini dilakukan selama 60 hari di laboratorium perikanan, Universitas Abulyatama. Data dianalisa menggunakan uji T (perbandingan) antara lobster yang diberi pakan nanokalsium dan tanpa penambahan nanokalsium. Nanokalsium yang ditambahkan ke dalam pakan sebanyak 2% berpengaruh nyata terhadap pertumbuhan lobster air tawar (thitung ttabel), dan berpengaruh sangat nyata terhadap jumlah molting dengan frekuensi molting 2,71 kali/ekor terhadap lobster yang diberi pakan nano CaO, sedangkan yang diberi pakan komersil hanya 1,29 kali/ekor. Namun, tidak berpengaruh terhadap tingkat kelangsungan hidup (thitung ttabel).

Coral husbandry for ocean futures: leveraging abiotic factors to increase survivorship, growth, and resilience in juvenile Montipora capitata

2021 ◽  
Vol 657 ◽  
pp. 123-133
Author(s):  
JR Hancock ◽  
AR Barrows ◽  
TC Roome ◽  
AS Huffmyer ◽  
SB Matsuda ◽  
...  
Keyword(s):  
Abiotic Factors ◽  
Larval Rearing ◽  
Abiotic Conditions ◽  
Montipora Capitata ◽  
Reef Restoration ◽  
Juvenile Corals ◽  
Bleaching Response ◽  
The Face ◽  
Survival And Growth ◽  
Global And Local

Reef restoration via direct outplanting of sexually propagated juvenile corals is a key strategy in preserving coral reef ecosystem function in the face of global and local stressors (e.g. ocean warming). To advance our capacity to scale and maximize the efficiency of restoration initiatives, we examined how abiotic conditions (i.e. larval rearing temperature, substrate condition, light intensity, and flow rate) interact to enhance post-settlement survival and growth of sexually propagated juvenile Montipora capitata. Larvae were reared at 3 temperatures (high: 28.9°C, ambient: 27.2°C, low: 24.5°C) for 72 h during larval development, and were subsequently settled on aragonite plugs conditioned in seawater (1 or 10 wk) and raised in different light and flow regimes. These juvenile corals underwent a natural bleaching event in Kāne‘ohe Bay, O‘ahu, Hawai‘i (USA), in summer 2019, allowing us to opportunistically measure bleaching response in addition to survivorship and growth. This study demonstrates how leveraging light and flow can increase the survivorship and growth of juvenile M. capitata. In contrast, larval preconditioning and substrate conditioning had little overall effect on survivorship, growth, or bleaching response. Importantly, there was no optimal combination of abiotic conditions that maximized survival and growth in addition to bleaching tolerances. This study highlights the ability to tailor sexual reproduction for specific restoration goals by addressing knowledge gaps and incorporating practices that could improve resilience in propagated stocks.

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