Differential Growth of the Mussels Perna perna and Perna viridis (Bivalvia: Mytilidae) in Suspended Culture in the Golfo de Cariaco, Venezuela (original) (raw)
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Tropical mussels Perna perna and P. viridis (Bivalvia: Mytilidae): Bottom or suspended culture?
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Growth and survival of size-classes of the green Perna viridis and the brown P. perna mussels were compared in suspended and bottom culture systems in the Southern Caribbean Sea. The size-classes (juveniles, medium-size and adults) were defined in relation to somatic and reproductive characteristics of both species. Survival of P. viridis in bottom culture was close to 100% in all size groups, while in P. perna was between 75-80% in juveniles and medium-size and 63% in adults. Survival of P. perna in suspended culture was higher than 85% for juvenile and medium-size individuals and less than 60% in adults, while in P. viridis was between 60-70% in juveniles and medium-size and 40% in adults. Perna perna in suspended culture showed higher
Ciencias Marinas, 2005
We evaluated the growth and influence of environmental factors under suspended culture conditions of the mussels Perna perna L. and P. viridis L. and of an undefined variant or morphotype sharing the substrate and morphological and colorcharacteristics of both species. The animals were grown for ten months at Turpialito Bay, located in the Gulf of Cariaco, Venezuela. The three experimental populations, seeded with an initial homogeneous size (45–50 mm), showed a similar growth pattern; however, P. viridis showed significantly smaller growth rates than those of P. perna and the morphotype, with a final dorsoventral shell length of 71.2, 77.0 and 77.8 mm, respectively. Correlativity analyses of environmental and growth factors could not define the somatic growth modulation due to environmental factors, but reproductive activity, particularly when it begins for the first time, may act as a negative endogenous factor. Although the results show similar physiological responses fromthe mus...
Brazilian Archives of Biology and Technology, 2005
The physiological conditions of mussels from Ubatuba and Santos and also of organisms transplanted from Ubatuba to Santos were studied by using different techniques. Assays for lysosomal stability were conducted on the haemolymph. Heart rate activity was monitored for 6h. The embryonic development of larvae obtained from the collected mussels was analysed. For all the compared groups of mussels, no significant differences were observed for the cardiac activity monitoring and the embryonic bioassays. The mean Neutral Red (NR) retention time was similar for the animals from Santos and Ubatuba, whereas the organisms transplanted to Santos showed a reduction in the retention time of the dye, indicating damage in the lysosomal membranes. These differences were possibly due to environmental factors, but further investigations are required to confirm this hypothesis.
Aquaculture Reports, 2020
Optimum temperature for growth of an invader population of green mussel Perna viridis (31.1 ± 1.9 mm SL; 0.8 ± 0.2 g DTW) from Guayacan Venezuela, was determined by means of scope for growth (SFG) at 22−34°C with an open-flow system. The objective was to find the suitability of its cultivation in the Gulf of Cariaco Venezuela. Morphometric relationships of shell length vs. wet and dry weights were obtained to determine the condition index of experimental mussels. SFG was highest at 26°C (64 ± 16 J g −1 h −1), was positive at 22-30°C (35 ± 3 and 20 ± 1 J g −1 h −1 respectively) and negative at 34°C (-39 ± 11 J g −1 h −1). Mussels employed were at good condition indicated by a positive allometry of shell length-total wet weight (bvalue = 3.7394) (R 2 = 0.397) which was higher than in native populations. Condition index (2.01-13.49) indicated that the mussels studied were not active in reproduction. Based on SFG results and temperature published data from the Gulf of Cariaco, it is concluded that temperature-wise this site (20.1-29.1°C) is appropriate for aquaculture of the population of P. virids studied. Further studies on the combined effect of temperature and seston concentrations over SFG are needed since a combination of high temperature and seston depletion frequently occurs in this site from September to January. The advantages of the new open-flow sytem for ecophysiological studies in aquatic organisms are discussed.
Aquaculture, 2000
The relative influence of three factors on the growth rate of mussels, Mytilus galloproÕincialis, Ž . cultivated in an inner area of the Rıa de Arousa NW Spain , was analysed. The three factors acted within the raft: position of the culture ropes on the raft, depth of cultivation and stocking density. Results indicate that depth of cultivation is the major factor affecting the growth of the mussels. In the two phases of the cultivation process, from seeding to thinning out and from thinning out to Ž . harvest, mussels cultivated in the upper part of the water column 2.5 m depth were significantly Ž . longer and heavier than those in the lower part 7.5 m depth . Effect of the position of the ropes on the raft was less important. Only at harvest, were significant differences in the weight of the Ž . mussels detected, with lighter mussels occurring at the back down-current of the raft. Surprisingly, stocking density showed no significant effect on the growth of the mussels in any of the two cultivation phases. From the results obtained in this experiment, some recommendations, important for the management of the Galician mussel cultivation, are given. q
The golden mussel, Limnoperna fortunei, is an invasive freshwater bivalve. Since its introduction to Argentina, it had caused damage to the native fauna as well as economic damage to industries of the region. Here, we describe the growth of L. fortunei in a natural temperate environment in Argentina. Age was estimated according to the modal progression method. The constants in the von Bertalanffy growth model were adjusted by an iterative algorithm. Three annual cohorts had similar growth rates. The estimated t 0 for each cohort showed a temporary displacement in relation to the spawning period.
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There is a great interest in establishing mussel farming in Dakhla bay. Selection of suitable sites is more meaningful only if a reliable culture method at proposed site is included. We compared two different culture methods, longline and pole, over 1 year (June 2016 to June 2017). Growth indicators for Perna perna (size and weight growth rates, frequency distributions and estimating growth curves) were analysed from seeding to harvest. The results highlighted the influence of culture method on growth rates of mussels (p < 0.05). At harvest, individuals reared on longline presented higher growth rates and consequently reached greater weight and length values than those reared on pole. Mussels reared at the longline grew 73.2 mm and gained 53.5 g W L (live weight) and 3.3 g W t (tissue dry weight) after 12 months of cultivation. However, mussels cultured at the pole gained only 52.3 mm, 26.7 g W L and 1.6 g W t. Aerial exposure of mussels at low tides could explain this reduced performance on pole compared with longline. Size frequency distributions at harvest fitted bimodal distribution in both cultures due to an asymmetric competition among individuals. Effect of density started in both treatments after 7 months of culture when mussels reached 60-70 mm, implying an increment of their food and space requirements. To prevent overcrowding, the initial density should have been reduced through "thinning-out." The longline method exhibited high-performance growth and hence is highly recommended for cultivation of P. perna in Dakhla bay. K E Y W O R D S aerial exposure, crowding conditions, mussel culture, mussel growth, Perna perna, suspended culture, time 1 | INTRODUCTION Commercial farming of mussels improves the income sources of fishing communities, create jobs and provide an alternative feedstock for use as feed. Mussel cultivation does not require highly sophisticated techniques compared with other aquaculture technologies. Furthermore, the cultivation of mussels requires careful consideration of environmental, ecological and seasonal factors to ensure proper growth and survival of the stock through harvest. Although the public mussel fisheries still exist, most production is based upon three culture techniques including suspended culture (raft and longline), pole culture and on-bottom culture (Prou & Goulletquer, 2002). Mussel culture technique can generally be divided