Fish species involved in mass washed up eggs in Chinchorro b

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Aquì a los que les interese, un nuevo artìculo que publiquè en la Revista Mexicana de Zoologìa:

Rev. Zool. 24:15-17-2013

Fish species involved in mass washed up eggs in Chinchorro beach, Arica
- Chile during the period of one year.

Felipe Méndez-Abarca1, Camila F. Méndez2, Ricardo A.
Reyes3, Héctor A .Vargas4 & Giovanni A. Aragón5.

It is established that the mass of eggs of some fish species are left on the
sand of Chinchorro beach due to the sea tide. Chinchorro beach is located
in Arica, Chile. This happens in a year –time period but the origin it is not
clear. The species found after the larvae hatch in captivity, corresponding
to marine pejerrey (Odonthestes regia) and the northern coastal stingray
(Sympterygia brevicaudata). Because studies are needed to go deeper
on the subject, in this way making sure the sustainability of the species
involved in the aforementioned phenomenon.

Keywords: Run aground, stranded eggs washed up, Chinchorro
beach, Odonthestes regia, Sympterygia brevicaudata.

Due to washed up mass of fish eggs in Chinchorro
beach area, Arica-Chile, it is necessary to know the
species to which these eggs belong to propose and
implement conservation and resource protection.
We collected egg masses of fish, recently stranded on
the shores of Chinchorro beach area, with a frequency
of two days per month during the period of one year
(from March 2011 to March 2012). Egg masses were
selected according to size and shape, spherical eggs
having been found an average size approximate to
0.6 mm. These formed masses ranging from a few
centimeters to some that exceeded two meters long
and ovigerous capsules to an average size 36.2 mm.
barrel-shaped, with horns on the anterior and posterior,
the characteristic brown color, translucent backlit,
whose appearance is similar to that described by Concha
y col., 2009, for the species Psammobatis scobina
(Philippi, 1857) (Rajiformes, Rajidae). The shape and
size segregation prevented the explosion occurred after
predation among larvae of different species.
Then separate the eggs and were placed in glass
aquaria containing sea water drawn from the same
area where collections were made, keeping in physical-
chemical conditions similar to those of sea water in
that area. Air was provided by an external pump with
membrane filtration with a filter made smooth inner
corner and change biweekly 20% of the total water of
the aquarium, the temperature was tested four times
a day, complementing all with the stabilization of the
air conditioning the laboratory.

Two species were characterized, Marine pejerrey
(Odonthestes regia) (Humboldt, 1833), his recognition
was based on meristic and morphological features
proposed by Chirichigno (1974) and (Medina y col.,
2004, this species corresponds to a highly important
resource for artisanal fisheries, there is a wealth of
information about the biology of silverside, so research
is needed on reproductive aspects that allow for conservation
management of this species Gómez y col.,
2006. Egg masses were collected Silverside from the
month of July to December, which coincides with the
data published by Mejia y col., 1970, who indicate
that the reproductive period Silverside months ranging
from July to November and more intense between
August and October. Coayla y col., 1991 argue that the
peak spawning of this species is given in the months
of May and August, not this statement coinciding with
the results of this work, because no egg masses were
found during May and June.
The other species characterized, the northern coastal
stingray (Sympterygia brevicaudata) (Cope, 1877)
(Rajiformes, Rajidae), described by morphological
characteristics indicated by Lamilla y Bustamante,,
2005 & Lamilla y Saez,, 2003. Ovigerous capsules for
this species were collected in small quantities, to an
average of 12 capsules per day of collection, from the
month of April to October.
In southern Peru, i.e., between Arequipa, Moquegua
and Tacna, these fish eggs stranded occur mainly in
the “moves” or “tidal waves” spring - summer, and extraordinarily
large proportion.

Confirming the experience Chinchorro beach, ovigerous
masses also correspond to smelt, correlated
the characterization of the eggs and the presence of
schools of this species in areas close to strandings. In
the Arequipa region, we observed a striking correlation
with the position of pejerrey in kelp forests of Lessonia
trabeculata (Villouta & Santelices, 1986) especially
brown, this experience is seen Biologist, personal
communication Martin Zambrano. This is evident from
what was reported at that time, the existence of a
direct relationship between the gonadosomatic index
and condition factor (environmental), Treviño (1999).
Possible causes of the mass stranded eggs of these
species are not yet certain. Further investigations are
urgently needed for sustainability.

LITERATURA CITADA
Chirichigno N. 1974. Clave para identificar los peces marinos del Perú.
Informe, Instituto del Mar Callao 44: 1-387.
Concha F, S Hernández & M Oddone. 2009. Egg capsules of the raspthorn
sandskate, Psammobatis scobina (Philippi, 1857) (Rajiformes, Rajidae).
Revista de Biología Marina y Oceanografía 44(1): 253-256.
Gómez C, A Perea & M Williams. 2006. Aspectos reproductivos del pejerrey
Odontesthes regia regia (Humboldt 1821) en la zona de Pisco durante
el periodo 1996-97 y mayo-julio del 2002, relacionados con su conservación,
141-147 pp. Departamento Académico de Biología, Universidad
Agraria La Molina, Lima.
Lamilla J & C Bustamante. 2005. Guía para el reconocimiento de tiburones,
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Medina M, C Vega & M Araya. 2004. Guía de peces marinos de la zona
norte de Chile. Industrias gráficas Tarapacá, 24 pp. Departamento de Ciencias
del Mar, Universidad Arturo Prat, Iquique.
Treviño H, W Condori & M Zambrano. 1999. Aspectos biológico-pesqueros
del pejerrey (Odontesthes regia regia) en el puerto de Ilo durante 1996-
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Saludos cordiales a todos.