Seafood watch recommends which seafood a. to buy or avoid b. to catch and sell c. to harvest sustainably d. is safe to eat

a. to buy or avoid because the people that sell the fish  or other seafood will probably tell you if it's not healthy to eat and if you avoid it you will most likely be more safe then risking catching something or dying

a. to buy or avoid

The Seafood Watch program helps in choosing the seafood on the commercial scale. It is best known for providing list of sustainable sea food advisory. This facilitates the consumption of sea food in a sustainable way, so that i will remain available for future generation.  It helps the consumers to make decisions for consumption of seafood. It places best choices and good alternatives for seafood among the consumers and gives information of seafood, which they should avoid.  

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.