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Weight Relationships (weight + relationships)
Selected AbstractsFrom egg to juvenile in the Bay of Biscay: spatial patterns of anchovy (Engraulis encrasicolus) recruitment in a non-upwelling regionFISHERIES OCEANOGRAPHY, Issue 6 2008XABIER IRIGOIEN Abstract In this study the spatial distribution of eggs, larvae and juveniles of European anchovy (Engraulis encrasicolus) was followed in 2004 and 2005 during three consecutive cruises each year in spring,summer to test what the limits of retention are in a non-upwelling area. Eggs, small larvae and large juveniles were mainly distributed over the shelf, whereas large larvae and small juveniles were found mainly off the shelf. Although overall distributions were similar, the 2 yr differed in that there was more of a coastal distribution of individuals in 2004, whereas in 2005 more individuals were found off the shelf. There were no significant differences in the length,weight relationships for individuals found on and off the shelf or between years. The correspondence in circulation patterns and the lack of difference in the length,weight relationships suggest that a single population is present, larvae drifting off the shelf due to currents and returning as mobile juveniles. Quantile regression analysis of the long-term recruitment index suggests that transport off the shelf may favour good recruitments. This would suggest that in non-upwelling regions the retention area resulting in good recruitment may not be restricted to the shelf. [source] Temporal variation of energy reserves in mayfly nymphs (Hexagenia spp.) from Lake St Clair and western Lake ErieFRESHWATER BIOLOGY, Issue 10 2003J.F. Cavaletto Summary 1. We analysed changes in energy reserves (lipid and glycogen) and length,weight relationships of burrowing mayflies (Hexagenia spp.) in 1997,99 to compare an established population in Lake St Clair with a recovering population in western Lake Erie of the Laurentian Great Lakes. In addition, we measured changes in water temperature and potential food in both water columns and sediments. 2. Although overall mean values of lipid and glycogen levels of Hexagenia nymphs from Lake St Clair and western Lake Erie were not significantly different, there were differences in seasonal patterns between the two lakes. In Lake St Clair, levels were highest in early spring, declined throughout the year, and reached their lowest levels in fall during all 3 years of study. In contrast, levels in western Lake Erie were lower in spring, increased to a maximum in summer, then declined in fall. Seasonal patterns in length,weight relationships were similar to those for lipid and glycogen. 3. Total lipid as a percentage of dry weight did not increase with developmental stage of nymphs until just prior to metamorphosis and emergence from water. However, the major reserve lipid, triacylglycerols, increased systematically with development stage. In the final stage of development, triacylglycerols declined, probably as a result of energy consumption and its conversion to other biochemical components for metamorphosis and reproduction. 4. Indicators of potential food (algal fluorescence in the water column and chlorophyll a and chlorophyll a/phaeophytin ratio in sediments) suggest that Hexagenia in Lake St Clair have a food source that is benthic based, especially in early spring, whereas in western Lake Erie nymphs have a food source that is water column based and settles to the lake bottom during late spring and summer. [source] Length,weight relationships for 36 fish populations from a disturbed tropical estuary in northern ColombiaJOURNAL OF APPLIED ICHTHYOLOGY, Issue 5 2009J. De la Hoz-M Summary The study reports length,weight relationships for 36 species belonging to 20 families of the estuarine zone of the Sinú River in northern Colombia. To the best knowledge of the authors, this study presents the first study on length,weight relationships for 10 species worldwide as well as seven new maximum lengths. [source] Length,weight relationships for ten shark species from Saros Bay (North Aegean Sea)JOURNAL OF APPLIED ICHTHYOLOGY, Issue 2009A. Ismen Summary Length-weight relationships are presented for ten shark species sampled with a commercial trawl vessel at depths ranging from 5 to 500 m between March 2005 and June 2008 in Saros Bay, Turkey. The values of the exponent b of the length-weight relationships ranged from 2.6816 to 3.6060. [source] Length,weight relationships of 17 less-studied fish species from Çanakkale, Marmara region of TurkeyJOURNAL OF APPLIED ICHTHYOLOGY, Issue 2 2009O. Ozen Summary This study reports length,weight relationships for 17 cryptic and rare species, Aidablennius sphynx, Arnoglossus kessleri, Callionymus pusillus, Callionymus risso, Clinitrachus argentatus, Echiichthys vipera, Gobius geniporus, Gobius paganellus, Labrus viridis, Lepadogaster lepadogaster, Ophidion barbatum, Pomatoschistus minutus, Pomatoschistus pictus, Salaria pavo, Tripterygion delaisi, Tripterygion tripteronotus and Zebrus zebrus from Çanakkale near shores in the Marmara region of Turkey. [source] Morphometric relationship of length,weight and chelae length,width of eastern white river crayfish (Procambarus acutus acutus, Girard, 1852), under culture conditionsJOURNAL OF APPLIED ICHTHYOLOGY, Issue 5 2007Y. Mazlum Summary Length,weight (TL vs WWT) and chelae length,width (ChL vs ChW) relationships were described for juveniles, males and females, and for form I and form II males of Procambarus acutus acutus. The length,weight relationships for juveniles, form I, form II males, and females could be described as: WWT = 5 × 10,3 TL3.09, WWT = 6 × 10,3 TL3.61, WWT = 6 × 10,9 TL3.26, and WWT = 6 × 10,4 TL3.5, respectively. In all forms, growth was allometric (P < 0.05). The ancova test indicated that slopes and intercepts of the length,weight regressions were significantly different between sex and sexual stages. The regressions for chelae length,width relationships for form I and form II males, and females were: ChW = ,0.81 + 0.27CL, ChW = ,0.33 + 0.25CL, and ChW = ,0.82 + 0.32CL, respectively. Although the slope and intercepts of regressions for ChL and ChW were similar for those of form I and form II males, the slopes and intercepts of regressions of females were significantly different from form I and form II males. No statistical difference was observed in mean ChL between form II males and females (P > 0.05), but a significant difference was detected in mean ChL between form I and form II males (P < 0.05) and form I and females (P < 0.05). Form I males had longer ChL than form II males and females. The same trend was observed in mean ChW for form I and form II males, but a significant difference was detected between form II males and females (P < 0.05). In addition, results indicated that chelae lengths and widths increased allometrically with total length (TL) for both sex and sexual stages. [source] Length,weight relationships for selected fish species from three eastern Adriatic estuarine systems (Croatia)JOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2006J. Dul Summary Length,weight relationships are presented for fish species from three eastern Adriatic estuarine systems (Croatian waters). The values of the parameter b mostly remained within the expected range of 2.5,3.5. No information regarding the length,weight relationship previously existed for 11 of the species. [source] Length,weight relationships for 22 fish species of the Mar Menor coastal lagoon (western Mediterranean Sea)JOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2006D. Verdiell-Cubedo Summary Length,weight relationships were estimated for 22 species of the Mar Menor coastal lagoon (south-eastern Spain): Lipophrys dalmatinus, Salaria pavo, Callionymus pusillus, Aphanius iberus, Engraulis encrasicolus, Gobius cobitis, G. niger, G. paganellus, Pomatoschistus marmoratus, Symphodus cinereus, Chelon labrosus, Liza aurata, L. ramado, L. saliens, Mugil cephalus, Diplodus puntazzo, D. sargus sargus, Lithognathus mormyrus, Sarpa salpa, Sparus aurata, Hippocampus guttulatus and Syngnathus abaster. The captures were made in shallow areas of the lagoon during 2002,2004. Significant length,weight relationships were found for all species. [source] A review of length,weight relationships of fish from the Segura River basin (SE Iberian Peninsula)JOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2006A. Andreu-Soler Summary We present the relationships between fork length and total weight for 14 fish species from the Segura River basin (southeastern Spain): Barbus sclateri, Chondrostoma polylepis, Gobio lozanoi, Aphanius iberus, Micropterus salmoides, Lepomis gibbosus, Carassius auratus auratus, Cyprinus carpio carpio, Sander lucioperca, Gambusia holbrooki, Liza ramado, Mugil cephalus, Atherina boyeri and Pomatoschistus marmoratus. Significant length,weight relationships were found for all species. The values of the exponent b of the length,weight relationships ranged from 3.82 for Sander lucioperca to 2.59 for Micropterus salmoides. [source] Length,weight relationships of cryptic reef fishes from the southwestern Gulf of California, MèxicoJOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2006E. F. Balart Summary Length,weight relationships of 33 cryptic reef fishes from the southwestern Gulf of California were estimated. The most common families were Gobiidae (seven species), Labrisomidae (four), Pomacentridae (three), and Tripterygiidae (three). These are the first length,weight parameters reported for 32 of these species. Specimens were sampled during a comparative ecological study of community structure of fish assemblages associated with coral heads, rocky walls, and artificial reefs in Bahía de La Paz, Baja California Sur. The b values varied between 2.63 and 3.61. New maximum length records for five of the species were established in the study. [source] Length,weight relationships of 10 deep-sea fish species from the Mexican Pacific OceanJOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2006J. De La Cruz Agüero No abstract is available for this article. [source] Length,weight relationships of fishes from three northern Aegean estuarine systems (Greece)JOURNAL OF APPLIED ICHTHYOLOGY, Issue 4 2003E. T. Koutrakis No abstract is available for this article. [source] Length,weight and length,length relationships of fish species from the Aegean Sea (Greece)JOURNAL OF APPLIED ICHTHYOLOGY, Issue 3 2002D. K. Moutopoulos We present the relationships between total (TL), fork (FL) and standard (SL) length for 37 fish species and the relationships between TL and wet weight for 40 fish species from the Aegean Sea (Cyclades; Greece). The relationships between TL, FL and SL were all linear (for all cases: r2 > 0.928). The values of the exponent b of the length,weight relationships ranged from 2.235 to 3.704. [source] Length,length and length,weight relationships for 48 fish species from reservoirs of the Paraná State, BrazilLAKES & RESERVOIRS: RESEARCH AND MANAGEMENT, Issue 4 2009Éder A. Gubiani Abstract Length,length and length,weight relationships was estimated for 48 fish species collected in 30 neotropical reservoirs located in the State of Paraná, Brazil. Significant relations were found for all species. The values of the parameter slope (b) in the length,weight relationship ranged from 2.49 to 3.46 for grouped sexes, and from 2.66 to 3.15 for separated sexes. Differences between sexes (indication of sexual dimorphism) were verified for 20 species. Males exhibited greater lengths than females for Astyanax janeiroensis, Bryconamericus iheringii, Geophagus brasiliensis, Glanidium ribeiroi and Hypostomus derbyi, whereas females attained greater lengths than males for the other 15 species examined in this study. [source] | ||||||||||