Ovarian development and induced oviposition of the overwintering swimming crab Portunus trituberculatus (Brachyura: Portunidae) reared in the laboratory
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Overwintering
Portunidae
Portunus trituberculatus
Portunus pelagicus
The reproductive characteristics of crabs play an important role in their fisheries management.The blue swimming crab Portunus pelagicus is one of the most commercially important crustaceans distributed along the Egyptian Coast; it has a great demand for their esteemed food.The spawning season of P. pelagicus was estimated based on three parameters: the monthly variation in both the maturity stages and in the gonado-somatic index (GSI) beside the histological examination of the ovarian structure.P. pelagicus was capable of continuous spawning throughout the year, where the mature stage was found to be distributed along the whole year indicating that crabs may be spawn at different times.P. pelagicus spawning mainly takes place twice, January-February (winter period) and June-August (summer period).As the monthly variation in GSI exhibit two distinct peaks in winter and summer.The mean size at which P. pelagicus became potentially reproductive (L m50 ) was estimated to be 9.32 cm CW for males and 8.45 cm CW for females.To achieve the sustainable utilization, it is recommended to increase the minimum fishing size of this crab to at least 11.0 cm CW to protect the stock biomass and allow young individuals to reach the suitable marketable size.
Portunus pelagicus
Portunidae
Spawn (biology)
Scylla serrata
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Portunus trituberculatus
Portunidae
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Megalopae and early juveniles of Portunus trituberculatus (Miers, 1876), a commercially important species, are known to utilize drifting seaweeds before transition to benthic habitats, but little is understood about this settlement behavior. Clinging and burying behavior of P. trituberculatus was investigated during nighttime and daylight by culturing megalopae and first to fifth crab stages in tanks with different bottom substrates (polyethylene, gravel, or sand) and an attachment substrate (artificial seaweed) in the water column. Clinging behavior on the artificial seaweed was observed for all growth stages. The proportions of individuals that exhibited clinging behavior increased from megalopae to the first crab stage, peaked in second and third crab stages, and declined through the fourth and fifth crab stages in all treatment groups. The proportion of crab stages that buried in the substrate was much higher in daytime than in nighttime (P < 0.001). For daytime observations, the burying rates linearly increased from first or second to fifth crab stages and were higher in tanks provided with sand as opposed to gravel. Our results suggest that early juvenile crabs utilize drifting seaweeds as a vehicle, and they voluntarily shift to benthos after the fourth crab stage when the risk of predation is reduced, as first to third crab stages are known to be vulnerable to predation by benthic fishes. The juveniles of P. trituberculatus thus appear to "hitchhike" drifting seaweeds before final settlement on the bottom. The present study supports the idea that hitchhiking behavior could be an important transport mechanism leading to settlement by larval and juvenile stages in decapod crustaceans.
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Portunidae
Scylla serrata
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The three-spot swimming crab Portunus sanguinolentus (Herbst, 1783) is a commercially important fishery species, widely distributed in the Indo-Pacific region. In this study, we present the complete mitochondrial genome of P. sanguinolentus. The genome is 16 027 bp in length with circular organization, encoding the standard set of 13 protein-coding genes, 22 tRNA genes, and two rRNA genes. The overall A + T content is 65.60%, which is lower than that of its congeneric species Portunus pelagicus and Portunus trituberculatus. The mitogenome carries 1254 bp of intergenic region constituting 7.82% of the genome, and six pairs of overlapping genes with the overlap size from 1 to 7 bp. The complete mitogenome sequence information of P. sanguinolentus would provide useful data for further studies on population genetics and molecular systematics.
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Portunus trituberculatus
Portunidae
Intergenic region
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Portunus pelagicus
Anomura
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"Stages of the Reproductive Cycle of the Female Crab Portunus Pelagicus (L., 1758) Based On the Anatomical Changes of the Spermatheca (Decapoda Brachyura, Portunidae)" published on 01 Jan 1988 by Brill.
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Portunus pelagicus
Spermatheca
Carcinology
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THE ECONOMICALLY IMPORTANT CRABS IN INDONESIA: Indonesia have many marine resources, one of it is crab. The worldwide have many spesies of crabs and the Indo-malaysia have approximatly 1000 spesies of crabs. During a few last years, the amount of crabs demand have increased. Portunidae is become one of the crabs which have important economic value in Indonesia. However, relying the production on natural capture gives on effect the number of crab populations has decreased.This paper discuss about charasteristios of crab especially Portunus pelagicus (Family : Portunidae) which have benefit economically value and should have managed wisely to become sustainable resources.
Portunidae
Portunus pelagicus
Overexploitation
Scylla serrata
Value (mathematics)
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The marine shellfishes of India is chiefly constituted by crustaceans and
molluscs. Among crustaceans, penaeid prawns are most important in view of the
quantum of landings, value and increasing demand for export trade. These are
followed by crabs and lobsters.
Although there are over 600 species of crabs recorded from Indian waters,
only a few of them are being used for food purposes (Rao et al., 1973). The
commonly utilised crab species for food in this country belongs to three families,
viz., Calippidae, Portunidae and Grapsidae.
Portunus pelagicus
Portunus trituberculatus
Portunidae
Scylla serrata
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Portunidae
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The lipid profiles, including lipid classes, phospholipid (PL) classes, fatty acid (FA) composition, and glycerophospholipid (GP) molecular species, in the two edible parts (edible viscera and muscles) of two species of cooked crabs (Portunus trituberculatus and Portunus pelagicus) were systematically characterized for the first time to reveal their nutritional values. For the muscles, PL (66.84–82.23% of total lipids) was the major component of lipids. While for the edible viscera, triacylglycerol (79.04–96.66% of total lipids) was the dominant lipid class. For all lipid samples, eicosapentaenoic acid (EPA) (3.47–22.02% of total FA) and docosahexaenoic acid (DHA) (7.30–16.52% of total FA) were the predominant FAs. Among PL from the crab muscles, phosphocholine (61.51–63.27 mol%) and phosphoethanolamine (21.58–23.43 mol%) were abundant. About 250 GP molecular species belonging to six classes, including glycerophosphocholine, lysoglycerophosphocholine, glycerophosphoethanolamine, lysoglycerophosphoethanolamine, glycerophosphoserine, and lysoglycerophosphoserine, were identified in crab muscles using direct infusion mass spectrometric method. A majority of the dominant molecular species of GP contained omega-3 polyunsaturated fatty acid, especially EPA and DHA. The useful information obtained in this study makes it possible to use crab lipid for producing higher value-added products for commercial exploitation.
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