Larval rearing of mud crab (Scylla): What lies ahead

Waiho, Khor; Fazhan, Hanafiah; Quinitio, Emilia T.; Baylon, Juliana C.; Fujaya, Yushinta; Azmie, Ghazali; Wu, Qingping; Shi, Xi; Ikhwanuddin, Mhd; Ma, Hongyu

doi:10.1016/j.aquaculture.2018.04.047

Cited by 81 publications

(83 citation statements)

References 143 publications

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“…The detailed morphological and morphometric differences among the four species in the genus Scylla-S. serrata, S. tranquebarica, S. paramamosain, S. olivacea-were described by Keenan, Davie & Mann (1998) and were used as the basis for species differentiation in most studies on mud crabs (Klinbunga, Boonyapakdee & Pratoomchat, 2000;Imai et al, 2004;Ikhwanuddin et al, 2011;Waiho et al, 2017b;Waiho et al, 2017c;Waiho et al, 2018), including the current study. These morphological differences are also used by farmers and crabbers to differentiate among species.…”

Section: Introductionmentioning

confidence: 99%

Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp

Fazhan

Waiho

Quinitio

et al. 2020

PeerJ

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There are four species of mud crabs within the genus Scylla, and most of them live sympatrically in the equatorial region. Apart from a report in Japan about the finding of a natural Scylla hybrid more than a decade ago after the division of genus Scylla into four species by Keenan, Davie & Mann (1998), no subsequent sighting was found. Thus, this study investigates the possible natural occurrence of potential hybridization among Scylla species in the wild. A total of 76,211 individuals from mud crab landing sites around the Malacca Straits, South China Sea and Sulu Sea were screened. In addition to the four-purebred species, four groups (SH 1, n = 2, 627; SH 2, n = 136; SH 3, n = 1; SH 4, n = 2) with intermediate characteristics were found, mostly at Sulu Sea. Discriminant Function Analysis revealed that all Scylla species, including SH 1 - 4, are distinguishable via their morphometric ratios. The most powerful discriminant ratios for each character and the top five discriminant ratios of males and females were suggested. The carapace width of SH 1 males and females were significantly smaller than pure species. Based on the discriminant ratios and the description of morphological characters, we hypothesize that the additional four groups of Scylla with intermediate characteristics could be presumed hybrids. Future work at the molecular level is urgently needed to validate this postulate.

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Section: Introductionmentioning

confidence: 99%

Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp

Fazhan

Waiho

Quinitio

et al. 2020

PeerJ

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“…For the reduction of dependency on the wild stock of crabs, development of crab culture is necessary. To date, the main problem remains the poor survival of crablets during nursing at young stages (Fielder & Allan, 2004;Waiho et al, 2018). The poor survival is considered mainly due to cannibalism but it is not fully understood yet (Chen, et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

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Boonyapakdee¹,

Bhujel²

2019

AquaSt

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The present research investigated the effects of nursing on blue swimming cablets (Portunus pelagicus Linnaeus, 1758) between Cup and Substrate methods for 35 days on the survival and growth with and without astaxanthin supplementation. Four treatments (Cup + Asta), (only Cup), (Substrate + Asta) and (only Substrate) were replicated three times in plastic tanks (500 L). Growth performance and the water quality parameters were monitored weekly. Results showed that there was no significant difference (P>0.05) between with and without astaxanthin supplementation in terms of survival, weight and carapace width. The survival of crablets decreased linearly over the nursing period and final survival of crablets in the Cup method (63.0%) remained three times higher (P<0.05) than the Substrate method (21.3%). The final average survival ranged from 16.7 to 68.5%. Among the water quality parameters, temperature, pH, Nitrite (NO2) and Nitrate (NO3) had negative linear correlations with survival, while dissolved oxygen (DO) had positive linear correlations. Average survival at 30 ppt salinity was 1.67 time higher than at 29 ppt salinity. In conclusion, to increase crablet survival during nursing, maintaining suitable environmental conditions and using Cup method are suitable for preventing cannibalism.

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“…Eng. 2020, 8, 213 2 of 13 and tidal currents) and biotic factors (food and food availability) associated with their habitat [10]. Moreover, in crustaceans with complex life cycles, their recruitment success, larval-juvenile survival, and growth may be affected by the variation in environmental conditions during embryonic and larval stages of development [11][12][13]; Gimenez and Torres, 2002).…”

Section: Methodsmentioning

confidence: 99%

“…Despite its ecological importance, this crab species is presently under the threat of extinction because of the changing environmental conditions caused by pollution, habitat destruction, and natural disasters. Several factors control the distribution and diversity of this species, including changes in abiotic factors (temperature, salinity, substrate type, and tidal currents) and biotic factors (food and food availability) associated with their habitat [10]. Moreover, in crustaceans with complex life cycles, their recruitment success, larval-juvenile survival, and growth may be affected by the variation in environmental conditions during embryonic and larval stages of development [11][12][13]; Gimenez and Torres, 2002).…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature on the Survival and Larval Development of Deiratonotus Japonicus (Brachyura, Camptandriidae) as a Biological Indicator

Lee

2020

JMSE

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Deiratonotus japonicus (D. japonicus) inhabits isolated locations and upstream brackish waters from Kanagawa Prefecture to Okinawa Prefecture in Japan. This species faces the threat of extinction because of changing habitat conditions. Our previous studies have shown that its complete larval development from hatching to metamorphosis consists of five zoeal stages and one megalopal stage. In this study, the effect of temperature on the survival and growth of larval development in D. japonicus under controlled laboratory conditions of 13, 18, 23, 24, 25, and 26 • C was investigated by rearing larvae (30 PSU; 12:12 h light/dark cycle; fed a diet of Brachionus plicatilis rotundiformis and Artemia sp. nauplii). The survival rates and developmental periods were measured for each larval stage. The highest survival rates were obtained at 18-24 • C. Metamorphosis to megalopa occurred at 23-25 • C. There were rapid and synchronous developments at 25-26 • C but delayed and extended developments at 13 • C. The molting period decreased with increasing temperature. With decreasing temperature, the beginning of the development and duration of molting was prolonged. In addition, there were very low survival rates at 13 • C and 26 • C in all zoeal stages. Our results indicate that the early larval stages of D. japonicus are well adapted to 18-24 • C, the range observed in the estuarine marine environment of the Kita River during the breeding season. Optimum larval survival and growth were obtained at 23 • C. Temperature significantly affected the survival rate, developmental period, and molting of the larvae. The relationship between the cumulative periods of development from hatching through individual larval stages (y) and temperatures (T) was described as a power function (y = a × Tb).

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Larval rearing of mud crab (Scylla): What lies ahead

Cited by 81 publications

References 143 publications

Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp

Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp

Untitled

Effects of Temperature on the Survival and Larval Development of Deiratonotus Japonicus (Brachyura, Camptandriidae) as a Biological Indicator

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