Observations on the tolerance of<i>Natatolana borealis</i>(Lilljeborg) (Crustacea, Isopoda) to reduced salinity

Johansen, Per-Otto

doi:10.1080/00364827.1999.10420443

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Beakers were examined after 6hr, 12hr, & 24hr of exposure then every 24hr till 72hr. Isopods were neither with visible movement nor response to the external touch by needle under binocular microscope were dead and removed (Johansen, 1999). Control groups were kept in salinity 33% and temperature 25 o C as these are the average that the isolated isopods were naturally exposed in field at time of collection.…”

Section: Introductionmentioning

confidence: 99%

Mediterranean Sea Fry; A Source of Isopod Infestation Problem in Egypt With Reference to the Effect of Salinity and Temperature on the Survival of Livoneca Redmanii (Isopoda: Cymothoidae) Juvenile Stages.

Mahmoud

Fahmy

Abuowarda

et al. 2019

Journal of the Egyptian Society of Parasitology

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Parasitic isopods have received considerable attention as they cause series impacts on their hosts either alone or with other environmental stresses such as water pollution. The present study investigated the infestation status with isopods among the fry collected from the natural sources .Also to demonstrate the effects of different salinity and temperature combination on the survival rates of the identified isopods under the laboratory conditions. In March 2017,a total of 16 thousand mugiliid fry were sampled from The Fry Collection center at Al Behera Governorate ,Egypt and examined for the presence of isopods .Samples were found infested with a rate of 10.6% , the result which practically documented that isopods were introduced into lake Qarun through dumping millions of infected fry from this source without biosecurity procedures. The isolated juvenile isopods were morphologically and molecularly identified as Livoneca redmanii species by using 16S rRNA gene and recorded in the GenBank with accession number: MK584629. The effects of variables of salinity/ temperature combination on the survival% of the identified juveniles showed that the best survival rate(100%) was recorded in salinity 15 -20% at temperature 25⁰C while the lethal combination was in salinity 10, 20,50 and 60% at temperature 35⁰C . Statistical analysis using A-two way ANOVA indicated a significant interaction between the effect of different degree of temperature and variance of salinity% on the survival of L. redmanii juveniles. Analysis of one way ANOVA indicated that the most effective temperature of overall mean temperature affected on survival of juvenile stage was 35 C⁰ while the most effective salinity percentage on survival of Juvenile from overall mean of salinity % was 10% .Results of this study provided applicable procedures which can be recommended as a precaution measures and for eliminating the isopod juvenile stages among the mugiliid fry.

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Section: Introductionmentioning

confidence: 99%

Mediterranean Sea Fry; A Source of Isopod Infestation Problem in Egypt With Reference to the Effect of Salinity and Temperature on the Survival of Livoneca Redmanii (Isopoda: Cymothoidae) Juvenile Stages.

Mahmoud

Fahmy

Abuowarda

et al. 2019

Journal of the Egyptian Society of Parasitology

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“…Natatolana borealis were collected at similar depths at both collection sites. The salinity was above 33.6 psu at the collection sites (Johansen, 1999). The yearly average temperatures at 100 m depth were calculated to be 7.68C in SkogsvÔg and 7.98C in Osterfjord, respectively.…”

Section: Growth On the Norwegian Coastmentioning

confidence: 94%

Contribution to the knowledge of growth and postmarsupial development of Natatolana borealis (Crustacea: Isopoda)

Johansen

2000

J. Mar. Biol. Ass.

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Postmarsupial development and growth of Natatolana borealis were studied from Skogsvåg and Raknesvåg on the western coast of Norway. Growth was determined from size and instar stage distributions. Growth was also examined in laboratory kept isopods that were collected from Skogsvåg. The postmarsupial instar stages were identified using the number of articles and the position of setae on the flagellum of the first antenna and other morphological features. The mean size of isopods in instar stages 1—3 did not show any significant seasonal variation in Raknesvåg. The estimated growth and mortality rates of males and females were not significantly different. Nine and 11 postmarsupial instar stages were found in material from Skogsvåg and Raknesvåg, respectively. The life span from instar stage 1 to 9 of male and female N. borealis from western Norway was estimated to be 3—4 y. Mortality rate increased significantly from instar stage 9 to 10 of both sexes. Isopods that attained instar stage 10 and instar stage 11 in Raknesvåg, may have lived 4—5 y. The mean size of instar stages 8 and 9 and the size-to-weight relationships were significantly higher in material from Raknesvåg relative to that from Skogsvåg and may have been caused by differences in food access and predation pressure at the two study sites. Specimens sampled from the Bay of Monaco attained smaller adult size than the isopods from the Norwegian population.

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Taxonomic revision of Natatolana (Crustacea: Isopoda: Cirolanidae)

Keable¹

2006

Rec. Aust. Mus.

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ABSTRACT. Natatolana Bruce, 1981 is one of the most speciose, widespread and abundant isopod genera occurring in marine environments. Species in the genus are ecologically important as scavengers and occasionally have a negative impact on commercial fisheries by feeding on catches restrained in traps, nets or on lines. The study of Natatolana species is hampered by difficulties in identification, inadequate descriptions and a lack of overall taxonomic revision. In this study, taxonomic, biogeographical and ecological information is reviewed for all 72 species of Natatolana now recognized worldwide. A revised generic diagnosis, a key to species, and diagnoses and synonymies for all species are presented.

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Observations on the tolerance ofNatatolana borealis(Lilljeborg) (Crustacea, Isopoda) to reduced salinity

Cited by 3 publications

References 7 publications

Mediterranean Sea Fry; A Source of Isopod Infestation Problem in Egypt With Reference to the Effect of Salinity and Temperature on the Survival of Livoneca Redmanii (Isopoda: Cymothoidae) Juvenile Stages.

Mediterranean Sea Fry; A Source of Isopod Infestation Problem in Egypt With Reference to the Effect of Salinity and Temperature on the Survival of Livoneca Redmanii (Isopoda: Cymothoidae) Juvenile Stages.

Contribution to the knowledge of growth and postmarsupial development of Natatolana borealis (Crustacea: Isopoda)

Taxonomic revision of Natatolana (Crustacea: Isopoda: Cirolanidae)

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