Some Ecological Notes on the Egg Deposition of Argulus coregoni THORELL (Crustacea, Branchiura)

Shimura, Shigeru; Egusa, Syuzo

doi:10.3147/jsfp.15.43

Cited by 22 publications

(25 citation statements)

References 2 publications

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“…Our finding confirms the experimental data of Shimura & Egusa (1980), who reported the highest density of A. coregoni eggs on artificial substrata sus- pended in the deepest layers of fish ponds. The distribution of the preferred hosts may account for the difference in habitat preference between A. foliaceus and A. coregoni.…”

Section: Discussionsupporting

confidence: 93%

Spatial distribution and hatching of overwintered eggs of a fish ectoparasite, Argulus coregoni (Crustacea: Branchiura)

Mikheev¹,

Pasternak²,

Valtonen³

et al. 2001

Dis. Aquat. Org.

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The habitat distribution of overwintered eggs, which were found to be the only source of spring recruitment of Argulus coregoni Thorell, was studied at a commercial fish farm in Central Finland. The frequency of occurrence of egg clutches in the deep parts of the canals and ponds was 50 to 80% and the percentage cover of the surface of stones with egg clutches was 1.7 to 6.4%, while in the shallow parts these values were 8 to 27% and 0.1 to 0.3%, respectively. A greater proportion of empty egg-shells was observed in shallow water in the mid-May, suggesting an earlier hatching there stimulated by the increased temperature and higher illumination. Under laboratory conditions, only elevated UV illumination, but not diurnally fluctuating temperature, significantly accelerated hatching. Normally overwintered eggs produced a pronounced peak of hatched larvae at the end of May and hatching continued at a much slower rate throughout the summer. Eggs that overwintered twice, first normally and then for a second time buried under sediments, were exposed to the same laboratory conditions simultaneously with normally overwintered eggs, but their hatching was delayed until August. The hatching rate was low, but markedly increased in December.

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Section: Discussionsupporting

confidence: 93%

Spatial distribution and hatching of overwintered eggs of a fish ectoparasite, Argulus coregoni (Crustacea: Branchiura)

Mikheev¹,

Pasternak²,

Valtonen³

et al. 2001

Dis. Aquat. Org.

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“…Accordingly, reports vary on the presence of parasitism in the earliest larvae: Wilson (1902) reported that first stage larvae of A. catostomi did not attach to fish, even if presented with several different choices of hosts. In contrast, in an experiment with the first stage larvae of A. coregoni, Shimura (1981) showed that newly hatched larvae would attack a cyprinid host before molting, and that the molt only occurred three to four days after hatching. Rushton-Mellor and Boxshall (1994) reported the Stage I larvae of A. foliaceus to last up to six days.…”

Section: Parasitic or Pelagicmentioning

confidence: 92%

Swimming and cleaning in the free‐swimming phase of Argulus larvae (crustacea, branchiura)—Appendage adaptation and functional morphology

Møller¹,

Olesen²,

Waloszek³

2006

Journal of Morphology

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The free-swimming early larval stages of Argulus foliaceus (Linneaus) (Branchiura) are studied using digital video, light microscopy, and SEM. We analyze and document the mode of swimming in the hatching stage of A. foliaceus and the subsequent juvenile stages with fully developed thoracopods. We present new observations and an analysis of the functional morphology of a cleaning behavior in the first stage. This stage swims very efficiently using the large exopods of the second antennae in concert with the mandibular palp (naupliar limbs), while the subsequent stages use the now developed thoracopods for propulsion. This posterior shift in propulsion is similar to-but independent from-what is seen in other crustaceans. The hatching stage has previously been referred as a ''metanauplius'' but as the first and second maxillae are developed and active, and buds of all four thoracopods are present, it is too advanced to be included in the naupliar phase. The hooks of the first antennae and the distal hooks of the maxillae are demonstrated to function not only as attachment organs (to the host), but also to play a significant role in the cleaning of the naupliar swimming appendages. A digital video-based analysis of the swimming mode is provided. The larval swimming pattern is generally similar to that of other crustaceans such as Branchiopoda and Cirripedia, but autapomorphies of the Branchiura include the following: 1) While actively swimming, the naupliar appendages are almost straight during the recovery stroke and 2) they have a relatively small deflection during movement ( 258 or 358 for mandible and second antenna respectively), 3) the larval mandible has a uniramous palp which is the retained exopod. The morphological implications of the transition from the possibly nonfeeding pelagic, or free-swimming, first larval stage to the feeding, parasitic second stage are discussed and compared with other crustaceans.

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“…Walossek, 1993) cannot be determined. Branchiurans bear an attenuation on the ventral face of the coxa, but it is retained throughout development (Shimura, 1981;Rushton-Mellor & Boxshall, 1994). The coxa of antenna 2 on early post-embryonic stages of ostracodes, remipedes, euphausiaceans, mysidaceans and dendrobranchiates has no ventral structure.…”

Section: Xiphosuransmentioning

confidence: 99%

“…] Branchiurans: C. caudal ramus is a transformed limb because it articulates with its somite; D. some arthrodial membranes fail to form during later stages but telson articulates; F. trunk limbs 2-4 are transformed during first molt and no more limbs are added. [Source: Shimura, 1981;Rushton-Mellor & Boxshall, 1994; present study.] Cephalocaridans: A. and D. arthrodial membranes separate limbless trunk somites; B. naupliar arthrite present (fig.…”

Section: Xiphosuransmentioning

confidence: 99%

Early Post-Embryonic Development of Marine Chelicerates and Crustaceans with a Nauplius

Ferrari¹,

Fornshell²,

Vagelli³

et al. 2011

Crustac

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Crustaceans that hatch as a nauplius-like larva, as well as xiphosuran and pantopodan chelicerates, are surveyed for five characters: presence or absence of arthrodial membranes separating somites; ventral configuration of the protopod of the second limb; number of transformed (segmented) limbs and limb buds; addition of segments to transformed limbs; fate of limb buds. An arthrodial membrane separates somites 7 and 8 of xiphosurans, a small knob articulates on the protopod of the second limb, and there are nine pairs of limbs but no limb buds. During early development, no arthrodial membranes are added, nor are segments added to limbs 1-9; limbs 10-14 are added as transformed limbs, not as limb buds, after several molts. On the post-embryonic larva of the presumed ancestral pantopodan, arthrodial membranes did not separate adjacent somites, the proximal segment of limb 2 was simple, there were three transformed limbs and no limbs buds. During subsequent molts, arthrodial membranes separated somites 4-7, buds of limbs 4-7 were added in register with each molt, limb buds were reorganized in register into transformed limbs during the following molt, and two segments were added to each transformed limb in register during the next molt.Somites of most crustacean taxa that hatch as a nauplius-like larva are not separated by arthrodial membranes on early post-embryonic stages; exceptions are posterior somites of branchiurans, mystacocaridans and cephalocaridans. Limb 2 (antenna 2) of branchiopods, copepods, thecostracans, mystacocaridans and cephalocaridans bears a naupliar arthrite on the ventral face of the coxa, on branchiurans there is an attenuation, or spine-like outgrowth, on the ventral face, and on 5 ) Corresponding author; e-mail: ferrarif@si.edu 6 ) e-mail: johnfornshell@hotmail.com 7 ) e-mail: avagelli@njaas.org 8 ) e-mail: ivanenko@mail.bio.msu.ru 9 ) Co-corresponding author; e-mail: hansdahms@smu.ac.kr © Koninklijke Brill NV, Leiden, 2011 Crustaceana 84 (7) ostracodes, remipedes, euphausiaceans, mysidaceans and dendrobranchiate decapods there is no ventral structure. Most of these crustaceans hatch with three transformed limbs; exceptions include myodocopan ostracodes with six and branchiurans with seven. The number of limb buds varies from none on remipedes to three on branchiurans and cephalocaridans. Limb buds of podocopan ostracodes, branchiurans, mystacocaridans and cephalocaridans are reorganized into transformed limbs after one molt; reorganization of limb buds of branchiopods, copepods, thecostracans, remipedes, euphausiaceans, mysidaceans and dendrobranchiates are delayed several molts. Early post-embryonic development of pantopodan chelicerates is more similar to that of podocopan ostracodes than it is to that of any other crustacean taxon, and no crustacean exhibits an early post-embryonic development similar to that of xiphosurans. Within the crustacean lineage, articulating somites, a naupliar arthrite or ventral attenuation on the coxa of antenna 2, and delayed reorganization of l...

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Some Ecological Notes on the Egg Deposition of Argulus coregoni THORELL (Crustacea, Branchiura)

Cited by 22 publications

References 2 publications

Spatial distribution and hatching of overwintered eggs of a fish ectoparasite, Argulus coregoni (Crustacea: Branchiura)

Spatial distribution and hatching of overwintered eggs of a fish ectoparasite, Argulus coregoni (Crustacea: Branchiura)

Swimming and cleaning in the free‐swimming phase of Argulus larvae (crustacea, branchiura)—Appendage adaptation and functional morphology

Early Post-Embryonic Development of Marine Chelicerates and Crustaceans with a Nauplius

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