We know that Pituitary Gland (PG) locate in fish brain. What is the name of that specific location/lobe?
The pituitary is usually attached to the brain ventrally, in the midline between the inferior lobes, anterior to the saccus vasculosus.
For illustrations of the pituitary in several teleost families see the following paper:
Honma, Y. 1957. On the pituitary gland of some Japanese teleosts. Japanese Journal of Ichthyology, v. 5 (nos 3-6): 175-181.
The pituitary gland is usually located at the ventral side of the brain between the inferior lobes, ahead of the saccus vasculosus.
You can check the following links which will be helpful for your request:
http://www.fao.org/docrep/005/ac742e/AC742E09.htm
https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/the-endocrine-system-16/the-pituitary-gland-hypophysis-155/the-posterior-pituitary-and-hormones-of-the-posterior-pituitary-787-9333/ (in this link check in "Variations amongst Vertebrates").
Experimentally, you can hypophysectomize a fish by an opercular approach. More details in the following paper:
Pang, P.K.T., M.P. Shreibman, F. Balbontín & R.K. Pang (1978). Prolactin and pituitary control of calcium regulation in the killifish, Fundulus heteroclitus. General and Comparative Endocrinology 36: 306-316.
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