2019-06-16T08:46:30Z
https://digital.csic.es/dspace-oai/request
oai:digital.csic.es:10261/52924
2016-02-17T09:12:29Z
com_10261_47
com_10261_8
com_10261_123
com_10261_152009
col_10261_300
col_10261_376
col_10261_158325
Guerra, Ángel
Manríquez, Mario
2012-07-06T12:00:48Z
2012-07-06T12:00:48Z
1980
Investigación Pesquera 44(1): 177-198 (1980)
0020-9953
http://hdl.handle.net/10261/52924
In the present work 1018 octopuses,
584 males and 434 females, of the commercial catches landed in Barcelona harbour (Mediterranean sea, Spain) sampled during a year, have been examinated. These specimens range
between 36 and 400 g. The dorsal mantle length, the live body weight, the eviscerate body weight, the mantle
width and the gonads weight (the testis and the ducts-Needham's sac weight for males and
the single ovary and the óviducts-nidamental glands weight for females) have been related
in order to obtain the relationship between them and to consider their real signification.
Linear regressions equations were calculated taking on account the following cases:
a) the total sample without sexes differentiation; b) the total sample with sexes separation;
c) distinguishing by sexes and seasons and d)considerig mturity stages. Teh standard error of the regression coefficients have been also calculated.
Using the adequate significance test, the following conclusions can be established:
1) In the relationship between the dorsal mantle length and the live body or the
eviscerate body weight the regressions coefficients calculated for the cases b) and c) in the
same population have significative differences.
2) For an accurate calculation of the relationship between the dorsal mantle length
and the mantle width it is suitable to separate the total sample in sexes and, after that,
to establish subsamples of individuals with the same maturity stage.
3) The relationship between the body weight and the different parts of the gonads
must be always calculated considering the maturity stage of the animals.
4) The observed seasonal variations of the regression coefficients can be explained for
the physiological changes, normally related with the sexual development.
Stepwise multiple regression analysis have been also used. We can conclude that this
sophistication does not increase subtantially the information of the linear regression equations: the incorporation of the variables to the best regression equation calculated for this method
has a biological sense, normally related with the sexual cycle of the octopus.
spa
openAccess
Parámetros biométricos de Octopus vulgaris
Artículo