Q1) if one prays namaz with a half sleeve or no sleeve shirt, does it make your namaz makruh? .... Q3) What is your opnion on Sea Food. some ulama consider it jayiz while others consider it makruh?

In the name of Allah, Most Gracious, Most Merciful  

Assalaamu `alaykum waRahmatullahi Wabarakatuh

1) It is Makrooh to wear a half sleeve or sleeveless shirt/kurta and perform Salaah.

(فتاوى محمودية ج6ص654,فاروقية)

2. a) It is Makrooh Tahrimi to perform Salaah with the sleeves folded.

(احسن الفتاوى ج3 ص406,سعيد)
(فتاوى محمودية ج6ص651,فاروقية)

b) It is necessary to keep the pants/upper garment above the ankles by hemming it otherwise by folding it. A person will be sinful for allowing his upper garment to flow below his ankles. Rasulullah (صلى الله عليه وسلم) has mentioned:

عن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم قال ما أسفل من الكعبين من الإزار ففي النار
( صحيح البخاري ج 2 / ص861, قديمي)

3) According to the Hanafi Mazhab, we are only permitted to eat from the sea that which falls in the category of fish. Any seafood classified as a fish will be Halaal to consume.

أما الذي يعيش في البحر فجميع ما في البحر من الحيوان يحرم أكله إلا السمك خاصة فإنه يحل أكله إلا ما طفا منه
الفتاوى الهندية  ج5 ص289,رشيدية))

قال  ولا يؤكل من حيوان الماء إلا السمك
(الهداية ج4 ص442,شركة)

And Allah knows best

Checked and Approved by:

Mufti Ebrahim Desai
Darul Iftaa