Toshi's work

I published my study about spawning of Pacific beakfish at North of Chile. Full text at my archive . Abstract Since 2006, the project "Optimizacion de la tecnologia de procuccion de juveniles de San pedro ( Oplegnathus insignis )" is running under INNOVA CORFO with CORDUNAP. Wild captured O. insignis are rearing at Universidad Arturo Prat Ciencia Del Mar (UNAPDCM) since 2002. Ten females (biomass 13.07 Kg) spawned 1,768,292 eggs with 20 times spawning under water temperature 19.3+-0.58C from January 7 to March 17, 2007. Spawning egg consist 1,574,492 floating eggs (89.0 %) and 1,457,692 hatch-out larvae (92.6 %). O. insignis is multiple spawning fish and the egg behave isolated epipelagie eggs, diameter is 0.87 to 0.96 mm. The egg has one oil droplet, diameter is 0.16 to 0.21 mm. Between spawning quantity and the average water temperature while 4 days before spawning shows the most strong relation at 19.6 C. Thus, the result suggests that the fish takes 4 days to mat...

The comparison of Mulata spawning in 2005 and 2006 as below. Wild captured G. nigra are rearing at UNAPDCM since 2002 and it starts spawned from 2002. Seven females (biomass 14,056 g) spawned 9,551,611 eggs with 83 times spawning under water temperature 15.8 ± 0.89 ° C from July 13 to November 1, 2005 . Spawned egg consist 6,956,117 floating eggs (72.8%) and it produces 4,487,154 hatch-out larvae (64.5%). Six females (biomass 13,035 g) spawned 15,657,954 eggs with 94 times under 16.5 ± 0.63 ° C from June 11 to October 17, 2006 . Spawned egg consist 7,947,405 floating eggs (50.8%) and it produces 5,422,681 hatch-out larvae (68.2%). G. nigra spawn several times in a spawning season and the spawning quantity per fish body weight shows 679,500 eggs/Kg in 2005 and 1,202,224 eggs/Kg in 2006. The strong relation shows between egg quantity and the average water temperature while 3 days before spawning and it abundant at WT 15.50 ° C in 2005. It has more spawning quantity at 16 ° C...

This is the spawning analysis of Graus nigra on 2005. Remarkable point is the method can identify the period and water temperature of maturation based on simple mathematics method. Abstract is below. Graus nigra is one of most common species which widely habit at Chile cost. Wild G. nigra brood stock, 7 female (BW 950 to 5,350 g) and 11 males (550 to 3,590 g), are reared at facilities of Universidad de Arturo Prat, Ciencias del Mar marine laboratory in Iquique Chile . G. nigra fatness rise to 35 to 42 and spawned naturally from July to October 2005. Spawning occurred 83 times and 9,551,611 eggs are collected in this term. Spawning occurred at water temperature 14 to 17 C. G. nigra produce large quantity and high quality fry at 15.0 to 15.5 C. Refer the file "-mulata-spawning-060516-en" at 　 http://groups.google.com/group/toshif Este analisis del desove de Graus nigra en 2005. Punto importante ha destacar es la utilizacion de un metodo con el cual pod...