Effect of stocking density and shelter on growth and mortality of early juvenile Jasus edwardsii held in captivity

2001 ◽  
Vol 52 (8) ◽  
pp. 1413 ◽  
Author(s):  
Phil J. James ◽  
Lennard J. Tong ◽  
Megan P. Paewai
Keyword(s):  
Survival Rates ◽  
Stocking Density ◽  
Maximum Growth ◽  
High Survival ◽  
Growth And Survival ◽  
Early Juvenile ◽  
Jasus Edwardsii ◽  
Spiny Lobsters ◽  
In Captivity ◽  
Overall Mortality

The effects of stocking density and the presence of shelter on the growth and mortality of early juvenile spiny lobsters, Jasus edwardsii, were determined over periods of 118 and 162 days respectively. Growth in length and weight were significantly slower with increasing stocking densities from 50 to 200 m–2, but overall mortality rates were very low and exhibited no difference amongst the densities tested. Conversely, shelter appeared to help to maintain high survival rates in early juvenile lobsters but had no effect on growth throughout the experiment. For maximum growth and survival in a commercial aquaculture operation, densities of 50 to 100 m–2, and adequate shelter would be recommended for early juvenile spiny lobsters. The implications of these results are discussed in relation to aquaculture of this species.

scholarly journals EFFECTS OF FEED ON THE SURVIVAL RATE, GROWTH RATE AND METAMORPHOSIS TIME OF THE WHITE LEG SHRIMP LARVAE (Litopenaeus vannamei Boone, 1931) AT ZOEA STAGE

2018 ◽  
Vol 54 (4A) ◽  
pp. 205
Author(s):  
Nguyen Van Cong
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Litopenaeus Vannamei ◽  
Survival Rates ◽  
Stocking Density ◽  
Growth And Survival ◽  
Study Results

The larvae of white leg shrimp (Litopenaeus vannamei Boone, 1931) at phase nauplii 6 fed with a stocking density of 150 pcs per litre and 3 formula including formula 1 with dry microalgae Spirulina + artemia as main ingredients, formula 2 with microalgae Thalasiosira weissflogii + artemia as main ingredients and formula 3 with microalgae Thalasiosira pseudonana + artemia as main ingredients. Experiments were carried out in 18 tanks fifty-litre composite at Quang Binh branch of C.P Vietnam Corporation. The study results show that, with formula 3, white leg shrimps larvae at zoea stage have the highest growth and survival rates (86.57 %), followed by formula 2 (76.03 %) and finally formula 1 (67.90 %). White leg shrimps larvae at zoea stage in formula 3 have the shortest metamorphosis time (78.61 hours), followed by formula 2 (83.25 hours) and the longest in formula 1 (94.10 hours).

Influence of Density and Depth on the Growth of Juvenile Sea Scallops (Placopecten magellanicus) in Suspended Culture

1993 ◽  
Vol 50 (9) ◽  
pp. 1857-1869 ◽  
Author(s):  
Jean Côté ◽  
John H. Himmelman ◽  
Michel Claereboudt ◽  
John C. Bonardelli
Keyword(s):  
Chlorophyll A ◽  
Seasonal Variations ◽  
Size Fraction ◽  
Stocking Density ◽  
Maximum Growth ◽  
Adductor Muscle ◽  
Placopecten Magellanicus ◽  
Growth And Survival ◽  
Suspended Culture ◽  
Sea Scallops

We examined the influence of depth and stocking density on the growth and survival of juvenile sea scallops (Placopecten magellanicus) in suspended culture at Gascons, Baie des Chaleurs. An increase in density greatly reduced the growth of the shell, adductor muscle, and other tissues, possibly because of lower food availability and diminished space. Growth was also influenced by depth and was greater at 9 m than at 21 m. However, the effect of depth was largely masked by the effect of stocking density and fouling of pearl nets. The pattern of seasonal variations in growth varied with the parameter used to quantify growth, and the changes were correlated with temperature and with chlorophyll a in one size fraction (0.7–5 μm). Survival was high at all depths and densities studied. Maximum growth was obtained at a density of 50 scallops∙net−1. However, the growth was only slightly reduced at 100 scallops∙net−1 and thus, this would be an ideal stocking density for growing scallops commercially if the objective is ear-hanging or bottom-seeding after 1 yr of suspended culture.

scholarly journals The Effect of Potassium Diformate Addition to Feed on Growth and Survival Rates of Common Carp (Cyprinus carpio L.)

2020 ◽  
pp. 1-8
Author(s):  
Ayi Yustiati ◽  
Mahmud Sa’id ◽  
. Junianto ◽  
Ibnu Bangkit Bioshina Suryadi
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Common Carp ◽  
Survival Rates ◽  
Stocking Density ◽  
Good Effect ◽  
Optimal Dosage ◽  
Daily Growth Rate ◽  
Daily Growth ◽  
Growth And Survival

This research aimed to determine the optimal dosage of potassium diformate addition to commercial feed in order to increase the growth and survival rate of common carp seeds. The method used in this research was experimental in a completely randomized design (CRD) consisting of five treatments and four replications. The treatments used were A (control), B with addition of potassium diformate (0.2%), C (0.3%), D (0.4%), and E (0.5%). For test fish, there were 200 of Common carp seeds with a size of 2-3 cm. The media used was 20 aquariums with a size of 40x30x40 cm3 and a stocking density of 10 individuals/aquarium. The rearing period was 35 days and the amount of feed given was 3% of the fish body weight. The parameters observed included water quality (temperature, pH, and dissolved oxygen) which were observed every 7 days for 35 days. Other parameters  monitored were daily growth rate, survival rate, feed efficiency, and the acidity level of the intestine. The results showed that 0.3% addition of potassium diformate gave the best results with a daily growth rate value of 3.21%, highest survival of 98%, efficiency of feed utilization of 64.83%, and a decrease in intestinal pH which helped the process of protein absorption in the fish body. In conclution, the addition of potassium diformate has good effect on growth and survival rates of common carp.

scholarly journals Observational developments of the culture of big-belly seahorse, Hippocampus abdominalis (Lesson, 1827): A conservation effort for the future

2019 ◽  
pp. 08-13
Author(s):  
Mohamad Saupi Ismail ◽  
Chee Kong Yap
Keyword(s):  
Life Cycle ◽  
First Generation ◽  
Survival Rates ◽  
Culture Technique ◽  
Significant Finding ◽  
Growth And Survival ◽  
Complete Life Cycle ◽  
The Future ◽  
In Captivity ◽  
Hippocampus Abdominalis

The objective of the present study was to document the growth and survival rates of Hippocampus abdominalis, beginning from captive-born to adulthood, and finally to the complete life cycle. The most significant finding from this culture study was that, after day 193, the life cycle of first generation of captive-born H. abdominalis in AkuaTAR was successfully observed. It is claimed that this is the first successful life cycle in captivity and production of the next generation of H. abdominalis in Malaysia. Our finding was obviously better because the survival rate was significantly higher when compared to those previously reported for this seahorse species. In short, the present observational study presented a simple culture technique that can produce optimum growth and survival through to adult stage of seahorse H. abdominalis. Hence, the present finding is important for conservation of seahorse H. abdominals in the future. Keywords: Seahorse; Hippocampus abdominalis; Closure of life cycle; Conservation

scholarly journals Effects of different temperatures on the growth and survival of mud crab (Scylla paramamosain) larvae

2021 ◽  
Vol 13 (3) ◽  
pp. 9-16
Author(s):  
Thanh Phuong Nguyen ◽  
Tinh Em Nguyen ◽  
Thi Kim Ha Nguyen ◽  
Quoc Viet Le ◽  
Thi Thanh Huong Do
Keyword(s):  
Carapace Width ◽  
Survival Rates ◽  
Stocking Density ◽  
Scylla Paramamosain ◽  
Mud Crab ◽  
Growth And Survival ◽  
Randomized Design ◽  
Different Temperatures ◽  
Temperature Levels ◽  
Two Stages

This study aimed to evaluate the effects of temperature on the growth and survival of mud crab (Scylla paramamosain) larvae in two stages including zoea-1 to megalopa (the first experiment) and megalopa to crablet-1 (the second experiment). Each experiment was conducted in a completely randomized design with four temperature levels (27, 30, 33, and 36℃) in triplicate. Stocking density of 200 ind./L for the first experiment and 4 ind./L for the second experiment. Fiberglass tanks of 500-L (containing 300-L and 250-L of 25‰ water for the first and second experiment, respectively) were used in the experiments. The results showed that S. paramamosain larvae at zoea-3 and zoea-4 died at 33℃ or above, while the highest survival rate of this stage was found at 27℃ (11.5%). The growth and larval stage index during the zoea to megalopa stage were significantly higher in 30℃ (p<0.05) compared to those in the 27℃ treatment. In the second experiment, the survival rates of crablet-1 were highest (72.9%) at 27℃ and lowest (34,7%) at 36℃. The growth rate of crablets at this stage increased with increased temperature. The highest carapace width and weight (3.41 mm and 0.030 g, respectively) were recorded at 36℃. The findings of this study suggested that mud crab larvae should be reared at the temperature range of 27-30℃ to maximize their production.

Evaluation of visible implant fluorescent elastomer (VIE) as a tagging technique for spiny lobsters (Jasus edwardsii)

2003 ◽  
Vol 54 (7) ◽  
pp. 853 ◽  
Author(s):  
Chris M. C. Woods ◽  
Philip J. James
Keyword(s):  
Abdominal Segment ◽  
Retention Rates ◽  
Muscle Fibres ◽  
Flexor Muscle ◽  
Growth And Survival ◽  
Tag Retention ◽  
Jasus Edwardsii ◽  
Spiny Lobsters ◽  
High Degree ◽  
Detrimental Impact

Tagging crustaceans for growth studies is often difficult because external tags/marks may be shed or cause mortalities during moulting. In this investigation, the effectiveness of visible implant fluorescent elastomer (VIE) as an invasive tagging technique for spiny lobsters (Jasus edwardsii) was investigated over a 6-month period. Tagged lobsters were either tagged with the tag running transversely across the ventral abdominal superficial flexor muscle block (transverse VIE) in the second abdominal segment, or in-line with the ventral abdominal superficial flexor muscle block (longitudinal VIE). Non-tagged lobsters were used as the control. At the conclusion of the investigation there were no differences in growth or survival between tagged lobsters and untagged controls and tag retention rates were 100% for both tagging treatments over the 6-month period. Tag visibility was high after six months in both tagging treatments, although higher in the longitudinal VIE treatment. Tag fragmentation was frequent in the transverse VIE treatment, but infrequent in the longitudinal VIE treatment. We conclude that VIE is an effective tagging technique for J. edwardsii in terms of the high degree of tag visibility, retention, and non-detrimental impact on the growth and survival of tagged animals, provided the VIE tag is injected in-line with the orientation of the muscle fibres/tissue.

scholarly journals Evaluation of Organic Wastes as Substrates for Rearing Zophobas morio, Tenebrio molitor, and Acheta domesticus Larvae as Alternative Feed Supplements

Insects ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 604 ◽  
Author(s):  
Endre Harsányi ◽  
Csaba Juhász ◽  
Elza Kovács ◽  
László Huzsvai ◽  
Richárd Pintér ◽  
...  
Keyword(s):  
Organic Waste ◽  
Survival Rates ◽  
Principal Component ◽  
Maximum Growth ◽  
Tenebrio Molitor ◽  
Acheta Domesticus ◽  
Vegetable Waste ◽  
Negative Effects ◽  
Growth And Survival ◽  
Garden Waste

Studies have focused on identifying combinations of insects and organic waste to optimise bio-conversion. Here, the effects of different diets (10% chicken feed complemented with 90% vegetable waste, garden waste, cattle manure, or horse manure) on growth and survival rates, and nutritional value of Zophobas morio and Tenebrio molitor larvae, and Acheta domesticus were investigated. Compared with chicken feed, organic waste decreased the individual larval weight, although green waste showed fewer negative effects than the manure. The macronutrient concentrations in garden waste were moderate compared with chicken feed, and vegetable waste was the poorest diet in terms of nutrient concentration, as revealed by the principal component analysis (PCA). There was no difference in weight between larvae reared on garden waste and those reared on vegetable waste. Tenebrio molitor and A. domesticus showed the maximum growth rates at 71–101 and 36–66 days of age at 22.5 ± 2.5 °C, respectively. The PCA showed that the protein and fibre concentrations were inversely proportional to fat concentration in the larvae. Acheta domesticus was rich in proteins, whereas Z. morio and T. molitor were rich in fat. Feeding nutrient-poor diets resulted in a lower protein and a higher fat concentration in the larvae.

An assessment of sponge mariculture potential in the Spermonde Archipelago, Indonesia

2007 ◽  
Vol 87 (6) ◽  
pp. 1777-1784 ◽  
Author(s):  
Nicole J. de Voogd
Keyword(s):  
Survival Rates ◽  
High Growth ◽  
Dry Weight ◽  
Growth Potential ◽  
Sponge Species ◽  
High Survival ◽  
Growth And Survival ◽  
South Sulawesi ◽  
Regular Time ◽  
Spermonde Archipelago

In the present study, carried out in the Spermonde Archipelago, south Sulawesi, Indonesia, an assessment is presented of the farming potential of six sponge species (out of nine candidates considered) possessing pharmacologically promising compounds, i.e. Aaptos suberitoides, Amphimedon paraviridis, Callyspongia (Euplacella) biru, Hyrtios reticulatus, Ircinia ramosa and Pseudoceratina cf. verrucosa. A total of 350 cuttings was threaded on a polyethylene rope and attached to horizontal mooring structures at three experimental sites. Growth and survival were monitored for a period of six months and for some explants for an additional period of ten months. All cuttings were photographed at regular time intervals and growth was measured as increase in length and dry weight. With the exception of P. cf. verrucosa, survival rates were high (80–96%) during the mariculture period. Size increases were too little to be measured in A. suberitoides and P. cf. verrucosa cuttings. Significant growth was only observed for C. biru. The high growth potential and high survival rate of this sponge species suggest that it is a promising candidate for further mariculture development.

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