scholarly journals Chela-height vs. body-weight relationships for North Sea hermit crabs (Paguridae)

2005 ◽  
Vol 62 (4) ◽  
pp. 723-726 ◽  
Author(s):  
Henning Reiss ◽  
Hermann Neumann ◽  
Ingrid Kröncke
Keyword(s):  
Body Weight ◽  
North Sea ◽  
Hermit Crab ◽  
Regression Function ◽  
Single Species ◽  
The Body ◽  
Hermit Crabs ◽  
Crab Species ◽  
Weight Relationship ◽  
The North

Abstract Biomass determination of hermit crabs is difficult without destroying the gastropod shells of the specimens. To minimize the number of animals destroyed in the process of determining this parameter over time, the chela-height vs. body-weight relationship of each of the three hermit-crab species was recorded in different areas of the North Sea. Linear regression was carried out for the species Pagurus bernhardus, P. pubescens, and P. prideauxi, in order to allow calculations of individual biomass on the basis of the chela height of specimens. No spatial differences in the chela-height vs. body-weight relationship were found for single species, whereas the relationship between the three species differed significantly. Thus, for each species a regression function is given, valid for the whole North Sea, that allows estimations of the body weight of the three hermit-crab species from measuring the chela height alone.

Metopelloides paguri sp. nov., a new species of symbiotic stenothoid amphipod (Crustacea: Amphipoda: Stenothoidae) associated with sublittoral hermit crabs from the Russian coasts of the Sea of Japan

Zootaxa ◽  
2012 ◽  
Vol 3244 (1) ◽  
pp. 59 ◽  
Author(s):  
IVAN MARIN ◽  
SERGEY SINELNIKOV
Keyword(s):  
New Species ◽  
Sea Of Japan ◽  
Hermit Crab ◽  
Hermit Crabs ◽  
The Sea Of Japan ◽  
Crab Species ◽  
Body Coloration ◽  
The Family ◽  
Mandibular Palp ◽  
A New Species

A new species of amphipod from the genus Metopelloides Gurjanova, 1938 (Crustacea: Amphipoda: Stenothoidae) asso-ciated with two species of sublittoral hermit crab species, Pagurus pectinatus (Stimpson, 1858) and Elassochirus cavi-manus (Miers, 1879) (Crustacea: Decapoda: Paguridae), is described from the Russian coasts of the Sea of Japan. The newspecies clearly differs from the congeners by the combination of morphological features such as telson without lateralspines, an elongated mandibular palp with single apical setae, the structures of distoventral palmar margins of subchelaon gnathopods I and II in females, bright white-red body coloration. Thus, the record of Metopelloides paguri sp. nov.represents the second record of the family Stenothoidae in the association with sublittoral hermit crabs from the Sea of Japan.

From single-species advice to mixed-species management: taking the next step

2004 ◽  
Vol 61 (8) ◽  
pp. 1398-1409 ◽  
Author(s):  
Morten Vinther ◽  
Stuart A. Reeves ◽  
Kenneth R. Patterson
Keyword(s):  
North Sea ◽  
Fishery Management ◽  
Single Species ◽  
Mixed Species ◽  
The North ◽  
Recent Approach ◽  
Starting Point ◽  
The North Sea ◽  
Management Advice ◽  
Management Priorities

Abstract Fishery management advice has traditionally been given on a stock-by-stock basis. Recent problems in implementing this advice, particularly for the demersal fisheries of the North Sea, have highlighted the limitations of the approach. In the long term, it would be desirable to give advice that accounts for mixed-fishery effects, but in the short term there is a need for approaches to resolve the conflicting management advice for different species within the same fishery, and to generate catch or effort advice that accounts for the mixed-species nature of the fishery. This paper documents a recent approach used to address these problems. The approach takes the single-species advice for each species in the fishery as a starting point, then attempts to resolve it into consistent catch or effort advice using fleet-disaggregated catch forecasts in combination with explicitly stated management priorities for each stock. Results are presented for the groundfish fisheries of the North Sea, and these show that the development of such approaches will also require development of the ways in which catch data are collected and compiled.

Characterisation of Salem Black goats in their home tract

2006 ◽  
Vol 38 ◽  
pp. 67-75
Author(s):  
A.K. Thiruvenkadan ◽  
K. Karunanithi
Keyword(s):  
Body Weight ◽  
Mortality Rate ◽  
Tamil Nadu ◽  
Herd Size ◽  
The Body ◽  
Goat Breed ◽  
The North ◽  
Chest Girth ◽  
Meat Goat ◽  
North Western

SummaryThe Salem Black is an important meat goat breed in the north-western part of Tamil Nadu, India. The native tract of this breed is the Salem, Dharmapuri, Krishnagiri, Erode, Karur and Namakkal districts of Tamil Nadu. Salem Black goats are tall animals, completely black in colour and reared mainly for meat. The average herd size of Salem Black goats was 31, of which there were 1 buck, 23 does and 7 kids The chest girth, body length and height at withers of Salem Black goats at full mouth age were 79.6±1.1 cm, 75.0±1.5 cm and 86.0±1.6 cm, respectively in males and 73.1 ±0.6 cm, 69.8±0.5 cm and 75.5±0.8 cm, respectively in females. The body weight of Salem Black goats at full mouth age was 38.5±1.0 kg in males and 29.5±0.6 kg in females. The average age at first mating was 9.5±0.4 months in males and 9.7±0.2 months in females, and the average age at first kidding was 14.8±0.2 months. The percentage of animals producing singles, twins, triplets and quadruplets was 54.1, 40.0, 8.2 and 0.4, respectively. Salem Black goats are allowed to browse extensively as a herded group for about seven to eight hours per day and are housed mostly (80%) during the night. Farmers kept breeding bucks, when available, in the herds at all times and exercised no controlled mating. The mortality rate in kids and adults was 7.5% and 2.3% respectively.

The records of Pagurus trigonocheirus (Stimpson, 1858) (Crustacea: Decapoda: Paguridae) from the continental coasts of the Peter the Great Bay of the Sea of Japan with the list of hermit crab species from the area

Zootaxa ◽  
2020 ◽  
Vol 4869 (2) ◽  
pp. 275-280
Author(s):  
IVAN MARIN
Keyword(s):  
Sea Of Japan ◽  
Hermit Crab ◽  
Peter The Great Bay ◽  
Hermit Crabs ◽  
The Sea Of Japan ◽  
Crab Species ◽  
Exact Sampling ◽  
Peter The Great ◽  
Great Bay

The sublittoral hermit crab Pagurus trigonocheirus (Stimpson, 1858) (Crustacea: Decapoda: Paguridae) is recorded from depths of 80–200 m along the continental coastline of the Peter the Great Bay, Sea of Japan. The exact sampling localities as well as photographs of live specimens are presented in the paper. Doubtful records of hermit crabs from the southern Russian coastline of the Sea of Japan are also discussed. 

Shell occupation and ectosymbionts of two hermit crab species in the South Atlantic: a comparative analysis

2015 ◽  
Vol 96 (7) ◽  
pp. 1535-1545 ◽  
Author(s):  
Felipe Bezerra Ribeiro ◽  
Helena Matthews-Cascon ◽  
Fernando Luis Mantelatto ◽  
Luis Ernesto Arruda Bezerra
Keyword(s):  
Comparative Analysis ◽  
Comparative Study ◽  
Hermit Crab ◽  
Hermit Crabs ◽  
Crab Species ◽  
Ecological Traits ◽  
South Eastern ◽  
Eastern Brazil ◽  
Habitat Differences ◽  
North Eastern

This study characterized shell occupation by two species of hermit crabs and analysed the occurrence of ectosymbionts on their shells, in a comparative way. The hermit crabsClibanarius antillensisandCalcinus tibicenwere selected for this comparative study because of their abundance and wide distributions. Specimens were collected manually during spring low tides every 2 months, from February 2011 to January 2012 in north-eastern Brazil (03°S), and in south-eastern Brazil (23°S). The populations showed different patterns of shell occupation and ectosymbiont coverage. The plasticity of these ecological traits is discussed in a broad context and possibly correlated to habitat differences.

scholarly journals Age and Growth in Phocoena Phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea

1978 ◽  
Vol 48 (1) ◽  
pp. 16-28 ◽  
Author(s):  
W.L. van Utrecht
Keyword(s):  
North Sea ◽  
Posterior Part ◽  
The Body ◽  
Age And Growth ◽  
Body Measurements ◽  
Lower Growth ◽  
The North ◽  
The North Sea ◽  
Lower Growth Rate ◽  
The Mean

Data and material are collected from 106 Harbour Porpoises (P. phocoena) from the southern part of the North Sea. All animals are accidentally caught or found stranded. The greatest length for males in the sample is 151 cm, for females 186 cm. For detailed analysis of body measurements, 30 males and 37 females are selected, while from 20 males and 34 females teeth are used for age analysis. The analysis of the body measurements shows sexual dimorphism in the anterior and posterior part of the back, in the flukes and flippers and in the position of the genital slit. The maximum number of dentinal layers found in the teeth is 12. Males attain sexual maturity after the deposition of 5 dentinal layers, females when 6 layers are formed, at a body length of about 135 cm and 150 cm, respectively. Some evidence is found that the population of P. phocoena from the North Sea has a lower growth rate than the population from Canadian waters. The gestation period is estimated to be eleven months, the peak of the birth period being in June. The animals are born at a length varying between 67 cm to 80 cm. Growth of the visceral organs is isogonic. The mean weight of the organs is greater in females than in males.

scholarly journals Shell occupation by the hermit crab Dardanus insignis (Decapoda, Diogenidae) from the north Coast of São Paulo state, Brazil

2015 ◽  
Vol 75 (4 suppl 1) ◽  
pp. 35-44
Author(s):  
I. F. Frameschi ◽  
L. S. Andrade ◽  
V. Fransozo ◽  
L. C. Fernandes-Góes ◽  
A. L. Castilho
Keyword(s):  
Hermit Crab ◽  
Great Majority ◽  
Dry Weight ◽  
Hermit Crabs ◽  
North Coast ◽  
The North ◽  
Stramonita Haemastoma ◽  
Wet Weight ◽  
Aperture Width ◽  
Internal Volume

Abstract The pattern of shell occupation by the hermit crab Dardanus insignis (Saussure, 1858) from the subtropical region of southeastern coast of Brazil was investigated in the present study. The percentage of shell types that were occupied and the morphometric relationships between hermit crabs and occupied shells were analyzed from monthly collections conducted during two years (from January 1998 to December 1999). Individuals were categorized according to sex and gonadal maturation, weighed and measured with respect to their cephalothoracic shield length (CSL) and wet weight (CWW). Shells were measured regarding their aperture width (SAW), dry weight (SDW) and internal volume (SIV). A total of 1086 hermit crabs was collected, occupying shells of 11 gastropod species. Olivancillaria urceus (Roding, 1798) was most commonly used by the hermit crab D. insignis, followed by Buccinanops cochlidium (Dillwyn, 1817), and Stramonita haemastoma (Linnaeus, 1767). The highest determination coefficients (r2 > 0.50, p < 0.01) were recorded particularly in the morphometric relationships between CSL vs. CWW and SAW vs. SIV, which are important indication that in this D. insignis population the great majority the animals occupied adequate shells during the two years analysed. The high number of used shell species and relative plasticity in pattern of shell utilization by smaller individuals of D. insignis indicated that occupation is influenced by the shell availability, while larger individuals demonstrated more specialized occupation in Tonna galea (Linnaeus, 1758) shell.

Condition factor and carapace width versus wet weight relationship in the blue swimming crab Portunus segnis

2015 ◽  
Vol 65 (2) ◽  
pp. 87-99 ◽  
Author(s):  
Ahmad Noori ◽  
Parvaneh Moghaddam ◽  
Ehsan Kamrani ◽  
Arash Akbarzadeh ◽  
Bita Kalvani Neitali ◽  
...  
Keyword(s):  
Body Weight ◽  
Condition Factor ◽  
Carapace Width ◽  
The Body ◽  
Swimming Crab ◽  
Present Contribution ◽  
Weight Relationship ◽  
Wet Weight ◽  
The Persian Gulf ◽  
Portunus Segnis

The size-weight relationship of a species allows for estimating the expected weight based on size. The present contribution aims at evaluating the body weight vs. carapace width relationship and the condition factor of the blue swimming crab Portunus segnis. These characteristics were analyzed for each sex using specimens collected monthly from April 2012 through to March 2013, at the Persian Gulf (Hormozgan Province, Iran). The size of each specimen was measured (carapace width) and weighed (total body wet weight). A total of 302 individuals of P. segnis were analyzed. The body weight-carapace width relationship indicated positive allometric growth in males and isometric growth in females. Body weight was higher in males than females of equivalent carapace width, and the means for condition factors were always higher in females than in males, due to the heavier gonads in the former, an expected pattern for many crabs. In both sexes, the lowest condition factor was detected in winter with an ascending trend in the next seasons. The oscillation in condition factor throughout the sampling year was more prominent in females and related to the reproductive cycle. The information reinforces data to define fishing closed seasons for this portunid that is used in many places in the world.

Intersexuality in hermit crabs: reproductive role and fate of gonopores in intersex individuals

2004 ◽  
Vol 84 (4) ◽  
pp. 757-759 ◽  
Author(s):  
Alexander Turra
Keyword(s):  
Hermit Crab ◽  
Population Biology ◽  
Reproductive Behaviour ◽  
Hermit Crabs ◽  
Crab Species ◽  
Morphological Alterations ◽  
True Hermaphroditism ◽  
Before And After

The function of intersex individuals in three intertidal hermit crab species (Clibanarius antillensis, C. sclopetarius, and C. vittatus) was investigated and a description of the morphology of the gonopores of laboratory-reared intersex individuals before and after moulting provided. Observations on the reproductive behaviour revealed that intersex individuals of these hermit crab species copulated successfully as males with normal females. Intersex individuals showed morphological alterations indicating closure of the female gonopores after moulting. These findings associated to information on behaviour and population biology of hermit crabs may suggest that hermit crab intersexuality may be part of a true hermaphroditism mechanism.

scholarly journals Biomass estimation using a length-weight relationship in beetle larvae (Coleoptera: Aphodiidae, Histeridae, Hydrophilidae, Staphylinidae) obtained from cow dung

2016 ◽  
Vol 85 (4) ◽  
pp. 399-407
Author(s):  
Radosław Mroczyński ◽  
Karol Daliga
Keyword(s):  
Body Weight ◽  
Dry Mass ◽  
Regression Equation ◽  
The Body ◽  
Biomass Estimation ◽  
Cow Dung ◽  
Linear Regression Equation ◽  
Weight Relationship ◽  
North Eastern ◽  
The Relationship

Abstract This research enabled the relationship between length and dry body mass to be determined for 158 beetle larvae taken from cow dung in north-eastern Poland. The larvae were divided into three morphological types, for which the power and linear function of the body length-weight relationship were determined. The linear regression equation characterizes the relationship between body weight and length for all morphological types of larvae very well (0.8955≤R2≤0.9752). The power regression equation characterizes this relationship for all morphological types of larvae well (0.8562≤R2≤0.9742).The equations obtained can be used to compute dry mass for most beetle larvae inhabiting dung.

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