Growth Pattern The Second Generation of Marine Fish Larvae Mangrove Red Snapper Lutjanus argentimaculatus (Forsskål, 1775) (original) (raw)
Related papers
Natural Spawning and Rearing of Mangrove Red Snapper, Lutjanus Argentimaculatus, Larvae in Captivity
Israeli Journal of Aquaculture-bamidgeh, 2003
Mangrove red snapper (Lutjanus argentimaculatus, Forsskal) spawned naturally in captivity, without the use of hormones or other treatments, from May 21 to September 15, 1999. Each female laid an average 2,350,000 eggs. Larvae were reared in 4-ton circular fiberglass tanks. They were first fed S-type rotifers (Brachionus rotundiformis). Later, Artemia nauplii and copepods were added to the diet. They were weaned onto an artificial diet. Metamorphosis began at 18 days when the larvae reached 10.5 mm total length and was complete by day 30 when larvae were 17.2 mm. From day 26, large larvae (over 25 mm) cannibalized their smaller siblings. Abnormalities were observed in 4.9% of the individuals. At 50 days, the larvae rearing trial produced juveniles of 49 mm average total length with a survival of 10.8-32.3%.
The Philippine Journal of Fisheries
The mangrove red snapper Lutjanus argentimaculatus (Forsskål 1775) is a high value, euryhaline marine fish with potential as a species for freshwater aquaculture. This study evaluated the growth and cost efficiency of the species in a freshwater pond in two experiments with three replications: (a) comparing stocking densities: (1) 0.5; (2) 1; and (3) 3 fish fish•m-2 reared for six months fed three times a day with trash fish to apparent satiation; and (b) comparing feed types: (1) trash fish; (2) moist diet; and (3) formulated dry pellet at a stocking density of 1 fish•m-2 fed to apparent satiation three times a day for seven months. The stocking density (SD) experiment showed significantly higher weight gain, absolute growth and specific growth rate (P<0.05) in 0.5 fish•m-2 SD (184.9 g; 1.04 g•day-1; 2.50%/day) than 3 fish•m-2 SD (172.7 g; 0.96 g•day-1; 2.38 %•day-1). No significant difference was detected between 0.5 fish•m-2 SD and 1 fish•m-2 nor between 1 fish•m-2 and 3 fish•...
The red snapper Lutjanus campechanus is a reef fish of major economic importance in the southeastern United States. Red snapper aquaculture is being investigated both for stock enhancement, as a tool for rebuilding wild stocks, and for commercial production motivated by the high demand and high market value for this species. A major limitation to red snapper aquaculture is the difficulty associated with the rearing of early larval stages. Red snapper larvae require copepod nauplii as an initial essential feed for a significant portion of the larval rearing period although large scale production of copepods, as would be required to meet the needs of commercial aquaculture or stock enhancement, is not feasible. Reducing the dependency on copepods would thus greatly enhance red snapper aquaculture. The present research aims to understand the nutritional requirements and digestive capacity of red snapper larvae in order to support development of feeding protocols and, in particular, the identification of potential alternative feeds to copepods. The ontogeny of the digestive system is being described using histology and measurements of the activity of digestive enzymes performed on larvae sampled at different staged of development from hatching to the end of the larval period. Preliminary results indicate a slow growth of larvae during the first 12 days post hatch. Gastric glands, indicating acquisition of stomach functionality, were first observed in 18 day old larvae using histology. Further research in progress includes analysis of the proximate composition of red snapper eggs and larvae and that of live feeds.
2012
The red snapper Lutjanus campechanus is a reef fish of major economic importance in the southeastern United States. Red snapper aquaculture is being investigated both for stock enhancement, as a tool for rebuilding wild stocks, and for commercial production motivated by the high demand and high market value for this species. A major limitation to red snapper aquaculture is the difficulty associated with the rearing of early larval stages. Red snapper larvae require copepod nauplii as an initial essential feed for a significant portion of the larval rearing period although large scale production of copepods, as would be required to meet the needs of commercial aquaculture or stock enhancement, is not feasible. Reducing the dependency on copepods would thus greatly enhance red snapper aquaculture. The present research aims to understand the nutritional requirements and digestive capacity of red snapper larvae in order to support development of feeding protocols and, in particular, the identification of potential alternative feeds to copepods. The ontogeny of the digestive system is being described using histology and measurements of the activity of digestive enzymes performed on larvae sampled at different staged of development from hatching to the end of the larval period. Preliminary results indicate a slow growth of larvae during the first 12 days post hatch. Gastric glands, indicating acquisition of stomach functionality, were first observed in 18 day old larvae using histology. Further research in progress includes analysis of the proximate composition of red snapper eggs and larvae and that of live feeds.
2017
Mangrove Red Snapper (Lutjanus argentimaculatus) is a large, palatable fish that has become increasingly valuable for aquaculture in South East Asia. Unfortunately, the bulk of current mariculture of L. argentimaculatus depends almost entirely on fingerlings collected from the wild, since hatchery-raised fry are regarded as inferior by fishermen. Wild Mangrove Red Snapper spawn on offshore reefs, but their larvae occupy coastal lagoons and estuaries. In this study, we examined some of the factors (habitat structure and salinity) associated with the natural recruitment habitat of L. argentimaculatus to determine whether they might play a role in the perceived superiority of wild-caught fry. We found statistically significant relationships between survival and salinity, and between somatic growth and habitat structure, but no interaction between the factors. Juvenile L. argentimaculatus survived best at moderate (17ppt) salinities, with fresher water (10ppt) providing better outcomes ...
Mangrove Red Snapper (Lutjanus argentimaculatus) is a large, palatable fish that has become increasingly valuable for aquaculture in South East Asia. Unfortunately, the bulk of current mariculture of L. argentimaculatus depends almost entirely on fingerlings collected from the wild, since hatchery-raised fry are regarded as inferior by fishermen. Wild Mangrove Red Snapper spawn on offshore reefs, but their larvae recruit to coastal lagoons and estuaries. In this study, we examined some of the factors (habitat structure and salinity) associated with the natural recruitment habitat of L. argentimaculatus to determine whether they might play a role in the perceived superiority of wild-caught fry. We found statistically significant relationships between survivorship and salinity, and between somatic growth and habitat structure, but no interaction between the factors. Juvenile L. argentimaculatus survive best at moderate (17ppt) salinities, with fresher water (10ppt) providing better ou...
Development of Feeding Ability in Red Snapper Lutjanus argentimaculatus Early Larvae
Fisheries science
Development of bones in the mouth parts and changes of gut contents were investigated in early red snapper Lutjanus argentimaculatus larvae reared with naturally-occurring zooplankton as food. Larvae immediately after initial mouth opening possessed incomplete bony components in the mouth parts. However, the bony elements grew rapidly in size on the day of initial mouth opening, day 0, dur ing which they started feeding. Acartia sinjiensis nauplii of 0.10-0.15 mm in total length (TL) were major food organisms at this stage. From day 1 to 2, no conspicuous changes occurred in the size and type of food organisms ingested, although some skeletal elements were added in the mouth part. Many new skeletal elements developed from day 3 to 4, as the size of food organisms in gut increased abrupt ly. The larvae started feeding on Oithona dissimilis copepodids (0.20-0.50 mm TL) and the weight percentages of the copepodids ingested increased thereafter. Early red snapper larvae acquired initial feeding ability by growing the size of a limited number of bony elements in the mouth parts. Further in crease in feeding ability was achieved by differentiation of additional bony elements from day 3 to 4.
1994
The development of embryos, larvae and juveniles of the Ryukyu-ayu, Plecoglossus altivelis ryukyuensis are described based on laboratory-reared specimens. The eggs were spherical, 0.98-1.18 mm (mean 1.06 mm) in diameter with an adherent membrane. The incubation period after fertilization was approximately 155 h at a water temperature of 19.7-22.0 ∞ C (mean 20.7 ∞ C). Newly hatched larvae were 5.0-5.9 mm (mean 5.5 mm) in body length (BL) with 59-62 myotomes. Within 5 days after hatching, the larvae had attained 6.4-8.2 mm (mean 7.8 mm) BL and had completely consumed their yolk. Notochord flexion began at 13.7 mm BL and was completed by 16.3 mm BL. The rudimental dorsal, anal, pelvic and adipose fins appeared at 14.7, 16.3, 21.8 and 21.8 mm BL, respectively. All fin rays reached the same fixed number of adult fish at about 28 mm BL. The comblike teeth began to form at approximately 30 mm BL and were fully developed at about 40-50 mm BL. The proportions of P. a. ryukyuensis specimens, which were consistent with adult fish, occurred at approximately 40 mm BL.
Aquaculture Research, 2009
The e¡ects of several feeding levels (1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4% and 4.5% of body weight per day, BWday À 1 ) on the growth, feed e⁄ciency and body composition of juvenile Lutjanus argentimaculatus (body weight 27.1g) were examined. Fish were fed a test diet (40% protein, 18.4% lipid and 13.4 kJ g À 1 ) for 75 days in three equal meals.Weight gain and spe-ci¢c growth rate increased with increasing feeding level up to 2.5% BWday À 1 , after which no signi¢cant improvement in growth was observed. The feed e⁄ciency, protein e⁄ciency ratio, retention of protein and digestibility of nutrients did not di¡er for ¢sh fed 1^2.5% BWday À 1 , but decreased signi¢cantly when feeding levels were increased above 3% BWday À 1 . The chemical compositions of whole ¢sh or body organs were signi¢cantly a¡ected by the feeding level. The condition factor, mesenteric fat, hepato-and viscerosomatic indices were higher in ¢sh fed 2.54 .5% BWday À 1 . The cholesterol, triglycerides and haematocrit values were similar among treatments, except that high levels of plasma lipids were recorded in ¢sh fed at 2.5% BWday À 1 . Taking into consideration the growth, feed e⁄ciency and body composition data attained in this study, a feeding level of 2.5% BWday À 1 is recommended for juvenile L. argentimaculatus weighing between 27 and 140 g.