Comparative Evaluation of Fecundity and Survivorship of Six Copepod (Copepoda: Cyclopidae) Species, In Relation to Selection of Candidate Biological Control Agents Against Aedes aegypti

Abstract

ABSTRACT. The fecundity and survival of 6 copepod species were assessed under laboratory conditions in order to choose the best candidates to control the aquatic stages of dengue mosquitoes in the field. Females of all the 6 species (Mesocyclops aspericornis, Mesocyclops pehpeiensis, Mesocyclops woutersi, Mesocyclops thermocyclopoides, Mesocyclops ogunnus, and Megacyclops viridis) mated more than once. Multiple mating resulted in increased egg production. The reproductive ability and longevity varied among the species, and M. aspericornis had the highest values. The lowest values were observed in M. thermocyclopoides. Multiple mating of males of M. aspericornis was also observed. The paternal fecundity decreased with each additional mating. There was no difference in the paternal fecundity between the males that mated at low and high female frequencies. The sperm stored in the M. aspericornis females remained viable for 30 days after storage under moist conditions at 25uC or 15uC. This feature in M. aspericornis represents an additional positive factor indicating that this species is a good biological agent for controlling mosquito larvae, especially in domestic water containers that may dry intermittently.

Effects of photoperiod on offspring production, development and generation time, survival, adult sex ratio and total life span of freshwater cyclopoid copepod,Mesocyclopssp.: comments on individual variations

“…Moreover, the inter‐clutch periods in this study were longer than those observed in the five Mesocyclops species (1.3–1.5 days) in the experiments of Phong et al . (); but shorter than that observed in Mesocyclops leuckarti (3.9 days) reported by Hopp et al . ().…”

“…; Phong et al . ). Although, a high variability is often obtained in copepod offspring production by using females placed in totally similar conditions, we observed individual high variability occurred in terms of daily offspring production rate, spawning frequency and total number of offspring spawned during the lifetime in Mesocyclops sp..…”

“…under different photoperiod regimes were shorter than those reported by Phong et al . () in case of some species of cyclopoid copepods. Phong et al .…”

“…Phong et al . () clearly noted that Mesocyclops aspericornis can be long‐lived (up to 74.5 days) with a prolonged reproductive life (up to 43 days) and highly fecund (18 clutches each with an average of 117 offspring) at photoperiod of 12:12 (L: D); but M. thermocyclopoides , showed shorter longevity (36.5 days) and reproduced for 31.2 days to produce 9.6 clutches each with 88 offspring, all as an average.…”

UJI MEDIA PEMELIHARAAN <em>Mesocyclops aspericornis</em> (Daday) DARI BERBAGAI KOTORAN TERNAK UNTUK MENINGKATKAN PRODUKSI COPEPODIT

“…Widyastuti et al (2004) telah menguji M. aspericornis di beberapa tipe penampung air warga untuk menurunkan populasi jentik Aedes aegypti, keberhasilannya menurunkan populasi jentik A. aegypti sekitar 79,86-92,78%. Perlakuan dengan enam jenis copepodits diaplikasikan pada satu percobaan sebagai kontrol biologi Aedes aegypti, ternyata M. aspericornis memiliki tingkat predasi efektif untuk memotong siklus larva Aedes aegypti (Phong et al, 2008). Beberapa penelitian terbaru mencoba mengkombinasikan M. aspericornis dengan jenis predator Tilapia nilotika, mampu menurunkan jumlah larva Aedes aegypti dari instar I-IV sebesar 7,9% (Nasir et al, 2015), dengan demikian peranan M. aspericornis untuk menurunkan larva Aedes aegypti cukup efektif.…”