• Title, Summary, Keyword: larval development

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Effects of Rearing Temperature and Photoperiod on the Larval Development of the Mulberry Longicorn Beetle, Apriona germari Hope, on an Artificial Diet

  • Yoon, Hyung-Joo;Mah, Young-Il;Moon, Jae-Yu
    • International Journal of Industrial Entomology
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    • v.1 no.2
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    • pp.137-141
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    • 2000
  • To determine effects of temperatures and photoperiods on larval development of the mulberry longicorn beetle, Apriona germari, the larvae were reared at various rearing temperatures and under the various photoperiods on an artificial diet. The larval period of A. germari was extended as long as the temperature was lowered. Also the larval development in terms of length and weight of larvae was increased. However, survival rate during larval stage significantly decreased at 15$^{\circ}C$ and $20^{\circ}C$ than at $25^{\circ}C$ and $30^{\circ}C$. The results indicated that the favorable temperature for artificial diet rearing of A. germari fell at least above $25^{\circ}C$ constantly. In photoperiod conditions, survival rate and larval development for A. germari were obviously most effective under a photoperiod of 14L:10B. As a result in artificial diet rearing of a. germari at $25^{\circ}C$ and under a photoperiod of 14L:10D was mostly favorable in terms of larval development and period.

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Development and Distribution of Dungeness Crab Larvae in Glacier Bay and Neighboring Straits in Southeastern Alaska: Implications for Larval Advection and Retention

  • Park, Won-Gyu;Shirley, Thomas C.
    • Animal cells and systems
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    • v.12 no.4
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    • pp.279-286
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    • 2008
  • Development and distribution of larval Dungeness crab, Cancer magister Dana, 1852 were investigated in southeastern Alaska from late May to mid-September in 2004. Larvae were collected during daylight hours at three inner and two outer Glacier Bay stations at the two different depths in the water column, above and below the thermocline. Larval density decreased dramatically for three larval stages, zoeae I(ZI), zoeae IV, and zoeae V(ZV), but relatively little for zoeae II and zoeae III. ZI predominated at all stations in late May and were collected until late July. Larval stages progressed seasonally from ZI to ZV and density decreased from ZI through ZV. The densities of each zoeal stage at the inner and outer bay stations and at the shallow and deep depths were similar. The density of each larval stage above(shallow) and below(deep) the thermocline and between inner and outer bay stations were not significantly different. The occurrence of larval Dungeness crab is dramatically later than in other parts of the species range, in that larvae appear in abundance beginning in late May. The pattern of spatial distribution of larval stages for the inland waters of Alaska was also markedly different than the patterns reported for Dungeness crab larvae from other parts of the species range, in that the early and intermediate stages occurred within inland waters; from British Columbia to California these larval stages increase in abundance with distance offshore.

Relationship Among Reproductive Traits and Brood Production Pattern of Caridean Shrimp, Palaemon gravieri (Decapoda: Caridea: Palaemonidae)

  • Kim, Sung-Han
    • Journal of Aquaculture
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    • v.20 no.3
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    • pp.194-198
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    • 2007
  • Reproductive traits of Palaemon gravieri such as embryo size, number of embryo (fecundity), incubation period, larval development mode, larval development period, larval survival and larval growth were described and compared to analyze the correlation among those traits. Embryo volume is a primary factor determining other ensuing reproductive features. Egg volume was $0.042mm^3$ in the first developmental stage. Embryo volume in P. gravieri was comparatively small which is indicative of great number of embryo (y = 3.0161x + 0.0185 $R^2$ = 0.74 positive isometric relationship) and relatively long incubation period. Larvae survived from zoea 1 to post-larvae and it took 45 days at $22^{\circ}C$. Survival rate of the larvae was rather great in the early stage and thereafter steadily decreased. Daily growth rate of larvae in P. gravieri at $22^{\circ}C$ was 0.0195 mm on average. They grew steadily as time went by. Incubation period was between 10-14 days at $22^{\circ}C$. Larval development mode was almost complete planktotrophic. PNR (point of no return) appeared to be the third day on average. Survival rate of larvae without feeding declined rapidly between 3 and 4 days. Larval development period and stage frequency were 23-30 days and 11 stages which imply prolonged larval period and high mortality. The pattern of brood production followed fast successive parturial pattern. Most ovigerous female had mature ovary when they performed parturial molt soon after hatching (larval release).

Effect of Starvation on Growth and Hepatocyte Nuclear Size of Larval Haddock, Melanogrammus aeglefinus

  • Kim, Bong-Seok;Park, In-Seok;Kim, Hyung-Soo
    • Development and Reproduction
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    • v.16 no.2
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    • pp.107-112
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    • 2012
  • Early growth, the rate of yolk sac absorption, and nucleus size in liver parenchymal cells were correlated with the nutritional status of first feeding larval haddock, Melanogrammus aeglefinus. Larvae that successfully began exogenous feeding maintained high growth rates, delayed yolk sac resorption, and had larger hepatocyte nuclear sizes than starved larvae. At 10 days post hatch (DPH) the cumulative mortality in the starved larval haddock group was 100%. The area of the hepatocyte nuclei in starved larvae gradually decreased, reaching its lowest value by 9 DPH. Our results support the current practice of providing the first food supply at 3 DPH. Hepatocyte nuclear size can be used to assess larval haddock nutrition status, and may be a good criterion for assessing the success of transition from endogenous to exogenous feeding.

Effect of Extracts from Some Selected Wild Plant Species on Larval Development and Adult Oviposition in Heliothis assulta (몇 가지 식물의 잎 추출물이 담배나방(Heliothis assulta) 유충의 발육과 성충의 산란에 미치는 영향)

  • 최강식;부경생
    • Korean journal of applied entomology
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    • v.28 no.3
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    • pp.113-119
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    • 1989
  • Larval development and adult oviposition of the Oriental tobacco budworm, Heliothis assulta were examined with tobacco leaves sprayed with aqueous or ethanolic extracts from ten selected wild plant species. High larval mortality was observed with extracts from Rhamnus davurice. Persicaria hydroPiPer, Forsythia koreana, Trifolium repens, Styrax japonica, Ginkgo bi/oba, and vilis amurensis. Most of larval mortality occurred during first and second instar, apparently due to antifeeding effects of plant extracts. These extracts also prolonged developmental period of survived larvae and increased the number of larval molts. Oviposition was not affected as much as the larval mortality, but Rhamnus davurice and Styrax jaPonica extracts reduced the number of eggs laid by more than fifty percent.

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The Larval Development of Petrolisthes japonicus (De Haan,1849) (Decapoda, Porcellanidae) in Laboratorv Culture (갯가게붙이(Petrolisthes japonicus)의 유생발생)

  • 이화자
    • The Korean Journal of Zoology
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    • v.36 no.1
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    • pp.67-76
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    • 1993
  • The lanral characters of Petrolisthes japonicus (De Haan, 1849), Porcellanidae, were described and illustrated. The lanral development of P. juponicus includes the two zoeal and one megalopal stases. The first and second zoeal stases lasted about 4 and 10 days, respectively. It took about 14 days to attain megalopa from hatching-The larval characteristics of P. japonicus were compared with those of other knouts species of Petrolisthes. Consequently, the lanrae of P. japonicus are more closely related to P elongatus and P ornutus than other Petrolisthes species, but the present species can be distinguished from these Petrolisthes species by morphological characteristics.

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Larval development of Rhinolithodes wosnessenskii Brandt (Decapoda: Anomura: Lithodidae) reared in the laboratory

  • Kim, Mi-Hyang;Hong, Sung-Yun
    • Animal cells and systems
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    • v.14 no.2
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    • pp.115-123
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    • 2010
  • The complete larval development of Rhinolithodes wosnessenskii Brandt, 1848 is described, based on laboratory rearing. The species has four zoeal stages and a megalopa. The zoeas of R. wosnessenskii are readily distinguished from all other described zoeas of the subfamily Lithodinae by having a middorsal spine of the posterior margin of the carapace.

Growth performance of the edible mealworm species, Tenebrio molitor (Coleoptera: Tenebrionidae) on diets composed of brewer's yeast

  • Kim, Seonghyun;Park, Ingyun;Park, Haechul;Lee, Heui Sam;Song, Jeong-Hun
    • International Journal of Industrial Entomology
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    • v.39 no.2
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    • pp.54-59
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    • 2019
  • Yellow mealworms (Tenebrio molitor Linnaeus) are very promising insects for the food and feed industry. Because mealworms are in the spotlight as an alternative protein source in the future, it is necessary to develop efficient rearing techniques for mass production. To evaluate the effects of brewer's yeast (BY) on the growth of mealworms, Tenebrio molitor Linnaeus, the mealworms were fed with wheat bran (WB) diets containing different levels of BY (0, 10, 30, 50, and 70%). Larval survival, larval weight, development time, pupal weight and eclosion rate were monitored for 12 weeks. The results showed that mealworms fed on the diets containing 30% and 50% of BY have significantly higher weight gain, specific growth rate and daily weight gain, and lower larval duration than fed the control diet (100% WB) and other BY diets (10% and 70% BY). Larval survival on the diets containing 30% and 50% of BY was higher than on control diet. Pupal weight and eclosion rate were not significantly different among all diets. In conclusion, we suggest feeding the diet containing 30% of brewer's yeast with wheat bran in order to increase the production of mealworms.

Complete Larval Development of a Sand Bubbler Crab, Scopimera longidactyla (Brachyura, Ocypodidae), Reared in the Laboratory (실험실에서 사육된 발콩게 (Scopimera longidactyla (달랑게과) 의 유생발생)

  • 장인권;김창현
    • Animal Systematics, Evolution and Diversity
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    • v.5 no.2
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    • pp.121-137
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    • 1989
  • The larval stages of Scopimera longidactyla reared in the laboratory are described and illustrated in detail. The larval development consists of five zoeal and a megalopal stages. At 25$^{\circ}C$, the megalopa and the first crab instar were attained in 21 and 31 days after hatching, respectively. The larvae of Scopmera can be distinguished from those of other genera in the Scopimerinae and other sumbfamilies in the Ocypodidae by the relativelength of rostral carapace spines to carapace. The larvae of S. longidactyla are similar in morphology to those of S. globosa but distingished by the differences in larval , size, and appendage setation.

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