Influence of growth and reproductive cycle on the meat yield and proximate composition of Hexaplex trunculus (Gastropoda: Muricidae)

2009 ◽  
Vol 89 (6) ◽  
pp. 1223-1231 ◽  
Author(s):  
P. Vasconcelos ◽  
M.B. Gaspar ◽  
M. Castro ◽  
M.L. Nunes
Keyword(s):  
Reproductive Cycle ◽  
Proximate Composition ◽  
Meat Yield ◽  
Marine Gastropods ◽  
Ria Formosa ◽  
Body Tissues ◽  
Hexaplex Trunculus ◽  
Southern Portugal ◽  
Banded Murex ◽  
One Year

This study aimed to assess the influence of growth and reproductive cycle on the meat yield and proximate composition of the banded murex (Hexaplex trunculus) from the Ria Formosa lagoon (Algarve coast, southern Portugal). Samples of the edible portion (all soft-body tissues) were analysed monthly during one year. The average meat yield was 37.9±4.6%, with females containing more edible content (39.1±4.7%) than males (36.8±4.2%). The proximate composition comprised 70.7±1.4% moisture, 20.1±1.2% protein, 1.6±0.3% fat, 3.0±0.3% ash, and 4.6±1.2% carbohydrate, corresponding to an energetic value of 119.2±7.5 kcal/100 g wet weight. The meat yield was influenced by specimen size, increasing significantly during growth. Both meat yield and proximate composition presented seasonal fluctuations related to the reproductive cycle, which coincided mainly with the periods of maturation and spawning of this species in the Ria Formosa. Finally, H. trunculus meat yield and proximate composition were compared with similar information available for other marine gastropods.

Morphometric relationships and relative growth of Hexaplex trunculus and Bolinus brandaris (Gastropoda: Muricidae) from the Ria Formosa lagoon (southern Portugal)

2015 ◽  
Vol 96 (7) ◽  
pp. 1417-1425 ◽  
Author(s):  
Paulo Vasconcelos ◽  
Carlos M. Barroso ◽  
Miguel B. Gaspar
Keyword(s):  
Shell Length ◽  
Morphological Plasticity ◽  
Shell Shape ◽  
Shell Weight ◽  
Geometric Morphometric ◽  
Relative Growth ◽  
Ria Formosa ◽  
Hexaplex Trunculus ◽  
Southern Portugal ◽  
Bolinus Brandaris

The present study reports morphometric relationships and discusses the relative growth in the banded murex (Hexaplex trunculus) and the purple dye murex (Bolinus brandaris) from the Ria Formosa lagoon (southern Portugal). A total of 11 morphometric parameters (eight linear variables: shell length, shell width, total aperture length, aperture length, aperture width, spire length, spire width and siphonal canal length; three ponderal variables: total weight, soft parts weight and shell weight) were analysed in both species. The analyses comprised numerous individuals of both sexes and with broad size ranges (H. trunculus: 10.7–82.8 mm shell length; B. brandaris: 14.6–107.7 mm shell length), fairly representative of the populations from the Ria Formosa lagoon. In general, B. brandaris exhibited greater morphological plasticity and higher variability in shell shape compared with H. trunculus. In both species, the vast majority of morphometric relationships displayed positive allometries, distantly followed by negative allometries and by isometries. Although H. trunculus and B. brandaris are known to lack external sexual dimorphism, several morphometric relationships revealed significant differences in the type of growth between sexes, which should be further confirmed using more powerful techniques, such as geometric morphometric analyses of shell shape.

Gametogenic cycle of Hexaplex (Trunculariopsis) trunculus (Gastropoda: Muricidae) in the Ria Formosa lagoon (Algarve coast, southern Portugal)

2008 ◽  
Vol 88 (2) ◽  
pp. 321-329 ◽  
Author(s):  
Paulo Vasconcelos ◽  
Belisandra Lopes ◽  
Margarida Castro ◽  
Miguel B. Gaspar
Keyword(s):  
Developmental Stages ◽  
Seawater Temperature ◽  
Simultaneous Occurrence ◽  
Fishing Activity ◽  
Spawning Period ◽  
Gametogenic Cycle ◽  
Ria Formosa ◽  
Gonadal Activity ◽  
Southern Portugal ◽  
Banded Murex

The gametogenic cycle of the banded murex, Hexaplex (Trunculariopsis) trunculus, from the Ria Formosa lagoon (Algarve coast, southern Portugal) was studied through macro- and microscopic analyses of the gonads during a 1-year study period (March 2003–February 2004). The overall samples presented a balanced sex ratio, with males dominating among smaller individuals and females predominating in larger size-classes. The gametogenic cycle of T. trunculus in the Ria Formosa lagoon comprised an extensive period of gonadal activity, with the simultaneous occurrence of distinct developmental stages of gametogenesis in both sexes almost year-round, and with males invariably presenting gonads in more developed stages of gametogenesis than females. Spawning occurred mainly from May to June 2003, apparently triggered by the rising seawater temperature during spring. Due to the extensive period of gonadal activity, T. trunculus exhibited a short resting phase that occurred simultaneously in both sexes between June and August 2003 and coincided with the period of warmest seawater temperatures. Considering these findings, a closed season in the fishing activity should be implemented during the main spawning period of T. trunculus (May and June), in order to protect the female broodstock and collective spawns.

scholarly journals Reproductive cycle of Bolinus brandaris (Gastropoda: Muricidae) in the Ria Formosa lagoon (southern Portugal)

2012 ◽  
Vol 16 (1) ◽  
pp. 69-83 ◽  
Author(s):  
P Vasconcelos ◽  
P Moura ◽  
CM Barroso ◽  
MB Gaspar
Keyword(s):  
Reproductive Cycle ◽  
Ria Formosa ◽  
Southern Portugal ◽  
Bolinus Brandaris

scholarly journals Bioinformatic tools help molecular characterization of Perkinsus olseni differentially expressed genes

2011 ◽  
Vol 8 (3) ◽  
pp. 130-140 ◽  
Author(s):  
Rita M. T. Ascenso
Keyword(s):  
Molecular Characterization ◽  
Protozoan Parasite ◽  
Bioinformatic Tools ◽  
Host Interaction ◽  
Ria Formosa ◽  
Genes Expression ◽  
Bioinformatic Tool ◽  
Southern Portugal ◽  
Heavy Mortality

Abstract In the 80ies, in Southern Europe and in particular in Ria Formosa there was an episode of heavy mortality of the economically relevant clam Ruditapes (R.) decussatus associated with a debilitating disease (Perkinsosis) caused by Perkinsus olseni. This protozoan parasite was poorly known concerning its’ differential transcriptome in response to its host, R. decussatus. This laboratory available protozoan system was used to identify parasite genes related to host interaction. Beyond the application of molecular biology technologies and methodologies, only the help of Bioinformatics tools allowed to analyze the results of the study. The strategy started with SSH technique, allowing the identification of parasite up-regulated genes in response to its natural host, then a macroarray was constructed and hybridized to characterize the parasite genes expression when exposed to bivalves hemolymph from permissive host (R. decussatus), resistant host (R. philippinarum) and non permissive bivalve (Donax trunculus) that cohabit in the same or adjacent habitats in Southern Portugal. Genes and respective peptides full molecular characterization depended on several Bioinformatic tools application. Also a new Bioinformatic tool was developed.

Occurrence and characterization of pearls from oysters of the genus Crassostrea

2016 ◽  
Vol 97 (2) ◽  
pp. 297-302
Author(s):  
Frederico M. Batista ◽  
Ana Grade ◽  
Deborah M. Power ◽  
Francisco Ruano ◽  
Elizabeth M. Harper
Keyword(s):  
Oyster Shell ◽  
X Ray Diffraction ◽  
Parasitic Copepods ◽  
Ria Formosa ◽  
Crassostrea Angulata ◽  
Mollusc Species ◽  
Southern Portugal ◽  
Foot Disease ◽  
The Right ◽  
Almost All

The occurrence of pearls in the ‘true’ oysters, the Ostreioidea, is poorly documented despite being the most produced mollusc species in the world. Oysters of the Crassostrea genus were collected in two different sites in southern Portugal where both Crassostrea angulata and C. gigas are present, namely in: (1) the Ria Formosa lagoon where pearls were not observed (N = 446); and (2) the Guadiana estuary where pearls were found in 12 out of the 798 oysters analysed. The pearls were located mainly at the edge of the right mantle lobe in the inhalant chamber and their maximum length ranged from 0.9 to 5.5 mm. Almost all the pearls had a white-cream colouration with the exception of two pearls that had a black-brown colour. X-ray diffraction analysis of one pearl showed that it was entirely calcitic with no traces of either aragonite or vaterite. The pearls observed were therefore non-nacreous pearls. Scanning electron microscopy (SEM) revealed a diversity of microstructures including prismatic, foliae-like sheets and blocky textures, i.e. highly reminiscent of the host oyster shell microstructures. Parasites (e.g. parasitic copepods, Haplosporidium-like plasmodia) and signs of diseases (e.g. foot disease) were observed in some of the oysters analysed, but they were not associated with the occurrence of pearls. The present work is one of the few studies on the occurrence of natural pearls in ‘true’ oysters and to our knowledge the first description of their microstructure by SEM.

scholarly journals Ovarian Histomorphology and Gonadial Cycle of Freshwater Garfish Xenentodon cancila (Hemilton-Buchanan) (Beloniformes:Belonidae)

BIBECHANA ◽  
1970 ◽  
Vol 8 ◽  
pp. 96-104
Author(s):  
Bharat Raj Subba ◽  
Satya Narayan Meheta
Keyword(s):  
Reproductive Cycle ◽  
Oocyte Development ◽  
Fish Pass ◽  
Early Maturing ◽  
Xenentodon Cancila ◽  
Pass Through ◽  
One Year

The histomorphology and gonadial cycle of a freshwater garfish Xenentoton cancila revealed that the ovaries of the fish pass through resting, early maturing advanced maturing, pre-spawning, spawning and spent phases within one year. The oogenetic activity starts in November and continues upto June(GSI=10.19)-July(GSI=11.38), when ovaries are full of yolky eggs. Only young oogonia and oocytes l appeared in September to October. The oocytes of l,ll,lll,lV and V stages were present during November to February. The oocytes Vl and Vll were seen dominated by ripe oocytes during June to late July when spawning takes place. Asychronism mode of oocyte development was recorded in X.cancila. Keywords: Xenentodon cancila; oocyte development; reproductive cycle; spawningDOI: http://dx.doi.org/10.3126/bibechana.v8i0.5694  BIBECHANA 8 (2012) 96-104

scholarly journals Sexual stages of the female portion in the scallop Nodipecten nodosus (Linné, 1758) and astaxanthin quantity in each stage

2010 ◽  
Vol 70 (3) ◽  
pp. 651-658 ◽  
Author(s):  
S. Sühnel ◽  
F. Lagreze ◽  
M. Bercht ◽  
JF. Ferreira ◽  
AL. Carneiro-Schaefer ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Culture System ◽  
Female Gonad ◽  
Sexual Stage ◽  
Microscopic Evaluation ◽  
Female Part ◽  
Sexual Stages ◽  
One Year ◽  
Spawning Periods ◽  
Nodipecten Nodosus

This work describes the gametogenic cycle of the scallop Nodipecten nodosus kept in a culture system. To this end, during one year, samples were taken from the broodstocks every 30 days to be submitted to macroscopic and microscopic analyses and to measure the amount of astaxanthin. To perform the microscopic evaluation, 5 μ slices from the median portion of the female part of the gonad were submitted to the pattern methodology for histological analyses with paraffin and HE coloration. The remaining portion of the female gonad was lyophilised to extract and quantify the levels of astaxanthin using HPLC. The microscopic analyses revealed four well defined stages for the reproductive cycle. Analyses of data taken throughout the year indicated preferential spawning periods from December to January and from July to September. The astaxanthin analyses showed higher amounts of this carotenoid during the advanced pre-spawning and the initial spawning periods than during gametogenesis, initial pre-spawning, advanced spawning, and the spent stages. According to these results, it was possible to establish a descriptive table of the sexual stages of the female portion of the gonad and the amount of astaxanthin in the sexual stage of the scallop Nodipecten nodosus.

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