Tag Archives: Tigris river

Some Biological Aspects of Golden Fish Carassius auratus from Tigris River, Tikrit/Iraq

Ameer Suood Alwan*(1) and Nehad Khorseed Wahab(2)

(1). Department of Agricultural Research, Ministry of Agriculture. Iraq.

(2). Animal production Department, Faculty of Agriculture, Tikrit University, Tikrit, Iraq.

(*Corresponding author: Dr. Ameer Suood Alwan. E-Mail: ameer.suood@yahoo.com).

Received: 02/07/2019                                Accepted: 02/10/2019

Abstract

Some biological aspects of golden fish Carassius auratus from Tigris River within Tikrit region studied from September 2013 to June 2014. Two hundred twenty-two fish (twenty-five males and one hundred ninety-seven females), their total length ranged from 11.5 to 29.0 cm and their total weight ranged between 19.36 to 399.76 g were caught. Regression coefficient (b) for the logarithmic relationship between length and weight was 3.22, 3.28 and 3.20 for males, females and both sexes, respectively. Condition factor (K) was 1.48, 1.50 and 1.49 for males, females and both sexes respectively. Condition factor increased with length for fish and differ between months. The highest gonad somatic index for males was 3.57 and it valued for females 9.24 in February. The spawning period extended from February to June. Sex ratio (males: females) tended toward females by 1:7.88 as well as in all months of the study, which ranged from 1:2.33 in October and 1:17 in May. The smallest mature male was 15 cm but for female it was 12.9 cm. The actual fertility ranged from of 1719 to 22185 eggs with average 7091 eggs and relative fertility ranged from 24.07 to 162.75 with an average of 92.57 g.

Key words: Biology, Carassius auratus, Tigris River, Tikrit, Iraq.

Full Paper in Arabic: PDF

Growth and Reproduction of Largemouth Bennini Cyprinion macrostomum in Tigris River, Iraq

Ameer Suood Alwan Hamad*(1) and Nehad Khorsheed Wahab(2)

(1). Department. of Agricultural Research, Ministry of Agriculture, Iraq.

(2). Animal production Department, Faculty of Agriculture, Tikrit University, Iraq.

(*Corresponding author: Ameer Suood Alwan Hamad. E-Mail: ameer.suood@yahoo.com).

Received: 02/07/2019                                Accepted: 27/08/2019

Abstract

Growth and reproduction of largemouth Bennini Cyprinion macrostomum was studied in Tigris river in Tikrit region, Iraq, during September 2013 to June 2014. 459 fish were collected, and the total length ranged between 11.8-24.7 cm and their total weight ranged from 19.9 to 184.58 g. The group of length of 14-16 cm accounted the largest percentage 40.52% of total fishing (1549) in September. The value of b=2.99 means that the growth was isometric. The condition factor ranged between 0.73-2.67 with average of 1.22. Condition factor differed according to sex and length. Sex ratio (male: female) tended to female 1:1.57. The highest gonadosomatic index for female was 7.17 and for male was 2.69 in June and the spawning period extended from May and June until August. The smallest length of a mature male reached 13.1 cm and in a mature female was 19.3 cm.

Key words: Growth, Reproduction, Cyprinion macrostomum, Tigris river, Iraq.

Full paper in Arabic: PDF